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1 Introduction. TinyCC (aka TCC) is a small but hyper fast C compiler. Unlike other C compilers, it is meant to be self-relying: you do not need an external assembler or linker because TCC does that for you. TCC compiles so fast that even for big projects Makefile s may not be necessary. Instead, default to an "install" directory under the source. # On Windows, prefer cl over gcc if both are available. By default most of. # the CMake generators prefer gcc, even on Windows. # This is a dummy target which all other targets depend on (manually - see other. # CMakeLists.txt files). This gives us a hook to add any targets which need to. Linker This stage runs the target linker to merge multiple object files into an executable or dynamic library. The output of this stage is typically called an ``a.out'', ``.dylib'' or ``.so'' file. The Clang compiler supports a large number of options to control each of these stages. In addition to compilation of code, Clang also supports other. This table does not list flags for managing an executable stack or the .bss section, under the assumption that these historic features have been phased out by now. Documentation for compiler flags is available in the GCC manual.Those flags (which start with -Wl) are passed to the linker and are described in the documentation for ld.. For some flags, additional explanations are in order:. Solved: I want to integrate video streaming (VideoStream SDK for iOS) to ArcGIS. But there are compiling error: duplicate symbol _ff_inverse in:. Meson says it's configured to use clang-9 lld for the host linker, but on my system, clang-9 actually uses wasm-ld under the hood. As you can see in wasm.meson, setting ld = 'wasm-ld' doesn't seem to help the issue.. Meson proceeds to add the -Wl,--allow-shlib-undefined flag to the linker flags, but wasm-ld doesn't recognize this option. The proper flag should be. Hi Team, Attaching relevant files showing the issue. we tried 3 compiler options , attached are the .c file , .ti_compiler_flags.bzl and command.txt file that show how our build behave with each of those options. Forces the linker to use relative paths to libraries instead of absolute paths. ShadowedVariables: Warn when a variable, type declaration, or function is shadowed. ... Pass the c++11 flag to the gcc/clang compilers (msvc ignores this currently) C++14: Pass the c++14 flag to the gcc/clang compilers (msvc ignores this currently). Linker. This stage runs the target linker to merge multiple object files into an executable or dynamic library. The output of this stage is typically called an a.out, .dylib or .so file. ... [plugin optimization flags] -c xyz.f90 *** $ clang -O3 -flto -lgfortran -o xyz xyz.o *** $ ./xyz optimization flags: flags that GFortran frontend will use. Solved: I want to integrate video streaming (VideoStream SDK for iOS) to ArcGIS. But there are compiling error: duplicate symbol _ff_inverse in:. Sanitizers are open-source tools for dynamic code analysis designed by Google. CLion integrates with the following Sanitizers: Useful links: Official documentation, Sanitizers in Clang, Sanitizers among Program Instrumentation Options in GCC. Sanitizers are implemented in Clang starting 3.1 and GCC starting 4.8. ld -o output /lib/crt0.o hello.o -lc. This tells ld to produce a file called output as the result of linking the file /lib/crt0.o with hello.o and the library libc.a, which will come from the standard search directories. (See the discussion of the ' -l ' option below.) Some of the command-line options to ld may be specified at any point in. CC and linker flags. Next, let's define common flags for CC and linker: CFLAGS="-O3 -fPIC" LDFLAGS="-lc" ... CC_FLAGS contains flags passed to the CC (Clang in our case). We're interested in. The driver prefix and driver separator are given by the values of the CMAKE_<LANG>_LINKER_WRAPPER_FLAG and CMAKE_<LANG>_LINKER_WRAPPER_FLAG_SEP variables. For example, "LINKER:-z,defs" becomes -Xlinker-z-Xlinker defs for Clang and -Wl,-z,defs for GNU GCC. The LINKER: prefix can be specified as part of a SHELL: prefix expression. The. Used only for -buildmode=c-archive. -extld linker Set the external linker (default "clang" or "gcc"). -extldflags flags Set space-separated flags to pass to the external linker. -f Ignore version mismatch in the linked archives. -g Disable Go package data checks. -importcfg file Read import configuration from file. In the file, set packagefile. Summary. Only add CMAKE_EXE_LINKER_FLAGS when in a standalone bulid. Or else CMAKE_EXE_LINKER_FLAGS contains flags for build compiler of Clang/llvm. This might not be the same as what the COMPILER_RT_TEST_COMPILER supports. eg: the build compiler use lld linker and we use it to build clang with. . Jul 05, 2022 · //Flags used by the linker during Release with Debug Info builds. CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO:STRING= //If set, runtime paths are not added when installing shared libraries,.Understanding Key Criteria For German Dating Sites October 10, 2019. 0. meson build with clang. Nov 07, 2019 · (Before LLVM 9, this is an internal. What is clangd? clangd understands your C++ code and adds smart features to your editor: code completion, compile errors, go-to-definition and more. clangd is a language server that can work with many editors via a plugin. Here's Visual Studio Code with the clangd plugin, demonstrating code completion: clangd is based on the Clang C++. clang 3.5 is here..... featuring C++14 support! Get Started Downloads C++14/C++1y Status Report a Bug Get Involved Planet Clang. If you pass coverage flags manually, you can use one of the following options depending on the compiler and coverage tooling you prefer: GCC-fprofile-arcs -ftest-coverage or --coverage. In this case, the gcov tool will be used. Clang / Clang-cl. Two options here: Use the same flags as for GCC to get the gcov-style coverage collected with llvm. Toolchain file to cross-compile from clang (WSL-Ubuntu) to Windows. - clang_windows_cross.cmake. The linker script, provided to Clang as -Wl,-T,foo.ld 1, is like a template for the final executable. It tells the linker how to organize code from the input objects. This permits extremely precise control over the toolchain's output. ... -Wl feeds arguments through to the linker, and -T is ld's linker script input flag. Thankfully,. I recently ran into the problem of configuring setuptools to use a custom compiler and linker, and these are my notes on how I did that. As an example, here is a simple setup.py for building the extension spam from spammodule.c: Invoking setup.py, we can see the compiler and flags used for building the extension. On my Mac:. Linker Output Options ¶. The options listed in the subsections below control how the linker generates output. On the tiarmclang command-line they should be passed to the linker using the -Wl or -Xlinker option as described in Passing Options to the Linker. Add support for MSVC-compatible /hotpatch flag in clang-cl, and equivalent -cc1 flag-fms. clang is a C, C++, and Objective-C compiler which encompasses preprocessing, parsing, optimization, code generation, assembly, and linking. Depending on which high-level mode setting is passed, Clang will stop before doing a full link. ... (this flag is automatically passed to the linker by Clang if compilation and linking are done in a single. Fortunately, the LLVM/Clang project has made every effort to support GNU GCC assembly, attributes, compiler flags & GNU linker script syntax, so a majority of the code in your project should already be compatible and the migration effort should be quite minimal. Make Build System Compiler Aware. The goal of the Clang project is to create a new C, C++, Objective C and Objective C++ front-end for the LLVM compiler. ... Refactor the x86 CPU name logic in the driver and pass -march and -mcpu flag information down from the Clang driver into the Gold linker plugin for LTO. This allows specifying -march on the linker commandline and should. is_clang. Returns true if the detected compiler is in the Clang family. is_sunstudio. Returns true if the detected compiler is in the Sun Studio family. add_extra_compiler_flags. Takes a string as argument that is added to the string of extra compiler flags. add_extra_linker_flags. Takes a string as argument that is added to the string of extra. The Clang Static Analyzer is a source code analysis tool that finds bugs in C, C++, and Objective-C programs. Currently it can be run either from the command line or if you use macOS then within Xcode. When invoked from the command line, it is intended to be run in tandem with a build of a codebase. The analyzer is 100% open source and is part. 3 (compiler updated to Apple clang version 13. clang : error: linker command failed with exit code 1 (use -v to see invocation) ** ARCHIVE FAILED ** To fix this, open your App Center project's Build Configuration, then click Save & Build, App Center will automatically choose the workspace correctly for future builds. 1. You can see at the Clang - FAQ that clang -cc1 is the frontend. clang is the GCC-compatible driver. And recently, a new driver has appeared, clang-cl, which is a CL-compatible driver. I don't know how to explain clang -cc1 properly but the word that matters is frontend. Note, that in case of compilation flags I said "required". By this I mean flags that wouldn't make sense for any other platform or any other toolchain (e.g. -mcpu=cortex-m4 -mfloat-abi=hard). This way your toolchain file will be very generic and you will be able to reuse it in different projects and different applications built from the. OpenSSL Library Options Option Description --prefix=XXX: See PREFIX and OPENSSLDIR in the next section (below).--openssldir=XXX: See PREFIX and OPENSSLDIR in the next section (below).-d: Debug build of the library. Optimizations are disabled (no -O3 or similar) and libefence is used (apt-get install electric-fence or yum install electric-fence).TODO: Any other features?. Clang is a compiler front end for the C, C++, Objective-C, and Objective-C++ programming languages, as well as the OpenMP, OpenCL, RenderScript, CUDA, and HIP frameworks. It acts as a drop-in replacement for the GNU Compiler Collection (GCC), supporting most of its compilation flags and unofficial language extensions. It includes a static analyzer, and several code analysis tools. Twitter https://twitter.com/thechernoInstagram https://instagram.com/thechernoPatreon https://patreon.com/thechernoSeries Playlist https://www.youtub. -G Ninja -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" -DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_USE_CRT_RELEASE='MT' -DCMAKE_SHARED_LINKER_FLAGS_RELEASE="/LTCG" -DCMAKE_EXE_LINKER_FLAGS_RELEASE="/LTCG" The average time was 55.3 seconds. With PGO and LTO enabled. MSVC documentation recommends always using LTO when building with PGO. 0016614: EXE Linker flags incorrect for clang: Description: The linker flags of the executable are set for GCC, but not clang. Thus compiling with clang leads to unresolved symbols when loading plugins. The attached patch fixes this. Tags: No tags attached. Patch: Yes: Activities fsimonis. Clang Linker properties (Android C++) The option overrides the default name and location of the program that the linker creates. (-o) Prints Linker Progress Messages. The -version option tells the linker to put a version number in the header of the executable. The -verbose option tells the linker to output verbose messages for debugging. Clang association, also known as clanging, is a speech pattern where people put words together because of how they sound instead of what they mean. Clanging usually involves strings of rhyming. Added Clang 3.5 support to all hosts: NDK_TOOLCHAIN_VERSION=clang now picks Clang 3.5. Note that: ARM and x86 default to using the integrated assembler. If this causes issues, use -fno-integrated-as; as a workaround. Clang 3.5 issues more warnings for unused flags, such as the -finline-functions option that GCC supports. This script is written in the linker command language. The main purpose of the linker script is to describe how the sections in the input files should be mapped into the output file, and to control the memory layout of the output file. Most linker scripts do nothing more than this. However, when necessary, the linker script can also direct the. The way I currently deal with this is to find the library header that a function was included from, use Github's search to find some other program that imports that same header, open its makefile, find the linker flags, copy them onto my compilation command, and keep deleting flags until I find a minimal set that still compiles. Include path management ¶. Flags controlling how #include s are resolved to files.-I<dir>, /I<dir>, -I<dir>, --include-directory <arg>, --include-directory=<arg>¶ Add directory to include search path. For C++ inputs, if there are multiple -I options, these directories are searched in the order they are given before the standard system directories are searched. LLVM/Clang/LLD/LLDB - The LLVM Compiler Infrastructure; This is a standalone build, which means this download offers a complete compiler environment for Windows. ... Solution: Add linker flag -lssp somewhere after the source or object files. For example for most projects using autoconf tools just add LIBS="-Wl,--as-needed -lssp" at the end of. -- The C compiler identification is Clang 3.8.0 -- The CXX compiler identification is Clang 3.8.0 -- Check for working C compiler: /usr/bin/clang -- Check for working C compiler: /usr/bin/clang -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done. gcc -L / -l option flags. gcc -l links with a library file. gcc -L looks in directory for library files. Syntax $ gcc [options] [source files] [object files] [-Ldir] -llibname [-o outfile] Link -l with library name without the lib prefix and the .a or .so extensions. Examples Example1. For static library file libmath.a use -lmath:. A linker must be prepared to deal with a mixed set of input files. For example, ... you will need to pass the undocumented -mllvm -emit-codeview-ghash-section flag to clang-cl (this flag should go away in the future, once this is considered stable and good enough to. Instead, default to an "install" directory under the source. # On Windows, prefer cl over gcc if both are available. By default most of. # the CMake generators prefer gcc, even on Windows. # This is a dummy target which all other targets depend on (manually - see other. # CMakeLists.txt files). This gives us a hook to add any targets which need to. Include path management ¶. Flags controlling how #include s are resolved to files.-I<dir>, /I<dir>, -I<dir>, --include-directory <arg>, --include-directory=<arg>¶ Add directory to include search path. For C++ inputs, if there are multiple -I options, these directories are searched in the order they are given before the standard system directories are searched. In the second case, the linker command likely fails because you didn't add the -fmemsafety option to the linker command line. In the first case, it seems to fail because gcc does not recognize the -fmemsafety flag. I don't understand why clang would call GCC to link the program instead of doing it itself. CLANG_FLAGS += -Werror=ignored-optimization-argument +CLANG_FLAGS += -mllvm -trap-unreachable KBUILD_CFLAGS += $(CLANG_FLAGS) KBUILD_AFLAGS += $(CLANG_FLAGS) export CLANG_FLAGS ``` There's more I need to do for LTO; `-mllvm` flags need to be passed to the linker in that case. Let me do a few more builds, collect statistics on build size. This flag is here to assist in the transition to split packages and will be removed in a future release. container-init: Makes the a staticly-linked init system tini available inside a container. device-mapper: Enables dependencies for the "devicemapper" graph driver, including necessary kernel flags. overlay. Listing 5: Second attempt at a cross-compile to iOS. This gets us further, but the compiler now emits a lot of errors along the lines of: 'UIScrollView' is unavailable: not available on Mac OS X Again, clang is trying to generate a Mac OS/X executable when what we want is an iOS executable.The solution is to add:. 1.7 GCC Compilation Process. GCC compiles a C/C++. Used only for -buildmode=c-archive. -extld linker Set the external linker (default "clang" or "gcc"). -extldflags flags Set space-separated flags to pass to the external linker. -f Ignore version mismatch in the linked archives. -g Disable Go package data checks. -importcfg file Read import configuration from file. In the file, set packagefile. When using LTO, clang compiles units into LLVM byte-code rather than machine code. In order to support linking such object files, the gold linker must be installed and set as the default linker, as it does support plugins. Similarly, ar needs plugin support as well. Sadly, binutils ar doesn't support passing '--plugin option before the actual. 2022. 6. 25. · This is also known as partial linking . -rdynamic. Pass the flag -export-dynamic to the ELF linker , on targets that support it. This instructs the linker to add all symbols, not only used ones, to the dynamic symbol table. This option is needed for some uses of dlopen or to allow obtaining backtraces from within a program. If you don't want to change the system setting, you can use clang's -fuse-ld option. In this way, you want to set -fuse-ld=lld to LDFLAGS when building your programs. LLD leaves its name and version number to a .comment section in an output. Fortunately, the LLVM/Clang project has made every effort to support GNU GCC assembly, attributes, compiler flags & GNU linker script syntax, so a majority of the code in your project should already be compatible and the migration effort should be quite minimal. Make Build System Compiler Aware. Summary. macOS paths usually start with /Users, which clang -cl interprets as a macro undefine, leading to pretty much everything failing to compile . CMake should be taught to put a --. Note: For 32-bit ARM, the compiler is prefixed with armv7a-linux-androideabi, but the binutils tools are prefixed with arm-linux-androideabi.For other. Clang is a compiler front end for the C, C++, Objective-C, and Objective-C++ programming languages, as well as the OpenMP, OpenCL, RenderScript, CUDA, and HIP frameworks. It acts as a drop-in replacement for the GNU Compiler Collection (GCC), supporting most of its compilation flags and unofficial language extensions. It includes a static analyzer, and several code analysis tools. After going over many SO answers, I've realised that the problem is that CMake is using Clang and not Homebrew's GCC. I've fixed this using a symlink, and now I get a different CMake error: (base) adamhaber-s-macbookpro1:build adamhaber$ cmake .. -- The CXX compiler identification is unknown -- Detecting CXX compiler ABI info -- Detecting. I do not > think it buys us anything. We never intended to be option-compatible with > nvcc and clang's CUDA compilation and relevant options have only partial > overlap with NVCC's functionality-wise and almost none syntax-wise. Adding > one rarely used option for the same of matching NVCC's is not worth it, IMO. 0016614: EXE Linker flags incorrect for clang: Description: The linker flags of the executable are set for GCC, but not clang. Thus compiling with clang leads to unresolved symbols when loading plugins. The attached patch fixes this. Tags: No tags attached. Patch: Yes: Activities fsimonis. Clang Front End & AST. Clang is a C language family front end for LLVM. In compiler design, a front end takes care of the analysis part, which means breaking up the source code into pieces according to a grammatical structure. The result is an intermediate representation which is transformed in a target program by the back end, called synthesis. Linker flags <clang-dxc options> Introduction ¶ This page lists the command line arguments currently supported by the GCC-compatible clang and clang++ drivers. -B<prefix>, --prefix <arg>, --prefix=<arg> ¶ Search $prefix$file for executables, libraries, and data files. If $prefix is a directory, search $prefix/$file -F<arg> ¶. As mentioned in the SoftBound GitHub repo, "LLVM/clang-3.4 introduces vectorization instructions [], SoftBoundCETS still does not handle these instructions. If you see false violations, use -fno-vectorize in your flags to avoid memory safety violations". ... Linker flags:-lm -lrt SAFECode. Compiler flags:-fmemsafety -g -fmemsafety. clang is a C, C++, and Objective-C compiler which encompasses preprocessing, parsing, optimization, code generation, assembly, and linking. Depending on which high-level mode setting is passed, Clang will stop before doing a full link. ... (this flag is automatically passed to the linker by Clang if compilation and linking are done in a single. As mentioned in the SoftBound GitHub repo, "LLVM/clang-3.4 introduces vectorization instructions [], SoftBoundCETS still does not handle these instructions. If you see false violations, use -fno-vectorize in your flags to avoid memory safety violations". ... Linker flags:-lm -lrt SAFECode. Compiler flags:-fmemsafety -g -fmemsafety. Extensions for selectively disabling optimization. Extensions for loop hint optimizations. Extensions to specify floating-point flags. Specifying an attribute for multiple declarations (#pragma clang attribute) Specifying section names for global objects (#pragma clang section) Specifying Linker Options on ELF Targets. Include path management ¶. Flags controlling how #include s are resolved to files.-I<dir>, /I<dir>, -I<dir>, --include-directory <arg>, --include-directory=<arg>¶ Add directory to include search path. For C++ inputs, if there are multiple -I options, these directories are searched in the order they are given before the standard system directories are searched. LLD is a linker from the LLVM project that is a drop-in replacement for system linkers and runs much faster than them. It also provides features that are useful for toolchain developers. The linker supports ELF (Unix), PE/COFF (Windows), Mach-O (macOS) and WebAssembly in descending order of completeness. Internally, LLD consists of several. Error: C Compiler is not able to compile a simple test program and clang-4.0: error: linker command failed with exit code 1 Follow Answered Xh1228. Chrome Linux/Mac clang build very similar to gcc Now trying to do the same on Windows. This is cl.exe. This is clang-cl.exe. This is clang-cl.exe. This is clang-cl.exe. clang-cl in Visual Studio. ... It understands the environment, the flags, and the tools Integrates with Visual Studio. Both GCC and Clang support using ld.lld instead of the system linker (which may well be lld, like on FreeBSD) via the command line switch -fuse-ld=lld. In my experience, I found that Clang's driver might get confused when picking the right linker on some uncommon platforms, especially before version 11.0. Once installed, both the linker and clang 3.9 should "just work"; specific installation instructions are beyond the scope of this blog post. Several new compilation and linking flags are needed for your project: -flto to enable link-time optimization, -fsanitize=cfi to enable all CFI checks, and -fvisibility=hidden to set default LTO. compile c++ clang online Language: Ada Assembly Bash C# C++ (gcc) C++ ( clang ) C++ (vc++) C (gcc) C ( clang ) C (vc) Client Side Clojure Common Lisp D Elixir Erlang F# Fortran Go Haskell Java Javascript Kotlin Lua MySql Node.js Ocaml Octave Objective-C Oracle Pascal Perl Php PostgreSQL Prolog Python Python 3 R Rust Ruby Scala Scheme Sql Server. Clang Front End & AST. Clang is a C language family front end for LLVM. In compiler design, a front end takes care of the analysis part, which means breaking up the source code into pieces according to a grammatical structure. The result is an intermediate representation which is transformed in a target program by the back end, called synthesis. With CMake 3.15 it has become possible to use the Clang compiler on Windows with a GNU-style command line. This also means that it's possible to use Clang with the Mingw-w64 toolchain. While it's possible to configure Clang with the Mingw-w64 (or MinGW) toolchain, if you decide to use Clang from the LLVM repo, it won't work correctly. Linker. This stage runs the target linker to merge multiple object files into an executable or dynamic library. The output of this stage is typically called an a.out, .dylib or .so file. ... [plugin optimization flags] -c xyz.f90 *** $ clang -O3 -flto -lgfortran -o xyz xyz.o *** $ ./xyz optimization flags: flags that GFortran frontend will use. To compile the program, you need to add -lclangParse to the linker flags. See tut04_parse.cpp for the complete program. To make the program slightly less boring, ... clang is somewhat modular: you can plug in a new parser as long as it conforms to the Action interface, several ast consumers can be used, etc. I can find several answers on how to add flags to a generated Xcode project but in the Android case it seems that even if you export to a Gradle project to build in e.g. Android Studio the export contains compiled version of the il2cpp generated code and not ndk scripts to build them over again. The Visual C++ compiler will not be used at all, but by default we'll link with the VC++ linker (which supports debug symbols) UEBuildWindows. bAllowClangLinker - Turns on the Clang linker (LLD.exe). You can now link UE4 programs with this, but you won't be able to debug in Visual Studio. Linker flags, e.g. -L<lib dir> if you have libraries in a nonstandard directory <lib dir>. Both CPPFLAGS and LDFLAGS need to contain the shell's value for setup.py to be able to build extension modules using the directories specified in the environment variables. LIBS¶ Linker flags to pass libraries to the linker when linking the Python. Bazel needs to know where to search for included headers. There are multiple ways to solve this, such as using the includes attribute of cc_binary, but here this is solved at the toolchain level with the cxx_builtin_include_directories parameter of cc_common.create_cc_toolchain_config_info.Beware that if you are using a different version of clang, the include path will be different. OpenSSL Library Options Option Description --prefix=XXX: See PREFIX and OPENSSLDIR in the next section (below).--openssldir=XXX: See PREFIX and OPENSSLDIR in the next section (below).-d: Debug build of the library. Optimizations are disabled (no -O3 or similar) and libefence is used (apt-get install electric-fence or yum install electric-fence).TODO: Any other features?. _CLANG_TIDY _COMPILER_LAUNCHER; _CPPCHECK; _CPPLINT _INCLUDE_WHAT_YOU_USE _LINKER_LAUNCHER _VISIBILITY_PRESET; LANGUAGE; LIBRARY_OUTPUT_DIRECTORY; LIBRARY_OUTPUT_DIRECTORY_ ... Linker flags to be used to create shared libraries. These flags will be used by the linker when creating a shared library. Compiler flags. Clang supports various options for stack based buffer overflow protection and mitigations against control flow attacks: ... =zero option is only supported with -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang. Glibc flags: see GCC page; Linker flags: see GCC page;. Unfortunately, clang-cl only supports a very limited subset of CL's flags. And if you want to talk to clang directly you have to go through an extra layer of indirection by using -Xclang -flag. By using clang directly you get the whole power of clang without arbitrary limitations (and as a bonus you can now compiler your software on mac and linux). Installation. Install the clang package.. Build packages with Clang. Add export CC=clang and (for C++) export CXX=clang++ to your /etc/makepkg.conf and for LTO support: Install the lld package, then add -fuse-ld=lld to LDFLAGS in your /etc/makepkg.conf.If you are building with debug, also remove -fvar-tracking-assignments from DEBUG_CFLAGS and DEBUG_CXXFLAGS as Clang does not support it. Linker. This stage runs the target linker to merge multiple object files into an executable or dynamic library. The output of this stage is typically called an a.out, .dylib or .so file. ... [plugin optimization flags] -c xyz.f90 *** $ clang -O3 -flto -lgfortran -o xyz xyz.o *** $ ./xyz optimization flags: flags that GFortran frontend will use. Note, that in case of compilation flags I said "required". By this I mean flags that wouldn't make sense for any other platform or any other toolchain (e.g. -mcpu=cortex-m4 -mfloat-abi=hard). This way your toolchain file will be very generic and you will be able to reuse it in different projects and different applications built from the. Using Clang with GDB on Windows. In order to make Clang emit DWARF debug symbols that GDB understands, you have to use the LLVM linker so you the full LLVM installation. The following line will compile and link an executable that can be debugged on GDB: clang.exe -O0 -gdwarf -c test.cpp -o test.obj && lld-link -debug test.obj. CMAKE_SHARED_LINKER_FLAGS and CMAKE_MODULE_LINKER_FLAGS (and their per-config variants) for SHARED and MODULE library targets as well. Use CMAKE_SHARED_LINKER_FLAGS instead. Thanks for the information guys. I'm having a minor problem with these variables though. Clang is a front-end to LLVM that supports C and the GNU C extensions required by the kernel, and is pronounced "klang," not "see-lang." ... instead CROSS_COMPILE is used to set a command line flag: ... CROSS_COMPILE is also used to derive --prefix=<path> to search for the GNU assembler and linker. Debugging¶. Debugging. One of the main advantages of debugging cross-platform Emscripten code is that the same cross-platform source code can be debugged on either the native pla. The Visual C++ Linker best practices: Developer Iteration. The time spent in the link phase could be a significant portion of an applications overall build time for most large projects. A user can quickly determine this by adding the '/time' flag to the linker command line. The 'Final: Total time' reports the total time spent in the. clang: error: linker command fail usinng -v compiler flag i got these information (some of it, can not upload a txt file od screen shot at the moment) Spoiler. The meaning of these flags aren't necessary obvious. The -Wl flags tell Clang to pass an argument to the linker, which is wasm-ld, i.e. LLD targeting WASM.--no-entry tells the linker not to define an entry point. If we don't pass this flag, LLD defaults to _start, and errors because we haven't defined that symbol.--export-all exports all symbols, so we can access them from JavaScript. This tutorial uses an example scenario to describe how to configure C++ toolchains for a project. It's based on an example C++ project that builds error-free using clang. What you'll learn. In this tutorial you learn how to:. CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS:STRING=${TARGET_I386_CFLAGS}") function (filter_available_targets out_var) set (archs) foreach (arch $ {ARGN}) ... # Call add_clang_compiler_rt_libraries to make sure that targets are built # and installed in the directories where Clang driver expects to find them. For example: $ clang x.o clang: error: no such file or directory: 'x.o' clang: error: no input files $ clang -Wl,x.o /usr/bin/ld: cannot find x.o: No such file or directory clang: error: linker command failed with exit code 1 (use -v to see invocation) We would now generate the latter message. Which doesn't really look much worse to me. Defines the syntax of compiler driver option to pass options to the linker tool. It will be used to translate the LINKER: prefix in the link options (see add_link_options() and target_link_options()).. This variable holds a semicolon-separated list of tokens. If a space (i.e. " ") is specified as last token, flag and LINKER: arguments will be specified as separate arguments to the compiler. Clang compiler and linker flags are documented here. swiftc --help command provides list of Swift command line flags. Surprisingly, I failed to find online documentation similar to Clang. When a build setting is set in Xcode UI, Xcode then translates it to appropriate flags for underlying tools. Clang Linker properties (Android C++) The option overrides the default name and location of the program that the linker creates. (-o) Prints Linker Progress Messages. The -version option tells the linker to put a version number in the header of the executable. The -verbose option tells the linker to output verbose messages for debugging. 1 Introduction. TinyCC (aka TCC) is a small but hyper fast C compiler. Unlike other C compilers, it is meant to be self-relying: you do not need an external assembler or linker because TCC does that for you. TCC compiles so fast that even for big projects Makefile s may not be necessary. clang is a C, C++, and Objective−C compiler which encompasses preprocessing, parsing, optimization, code generation, assembly, and linking. Depending on which high−level mode setting is passed, Clang will stop before doing a full link. ... (this flag is automatically passed to the linker by Clang if compilation and linking are done in a. KERNEL_CC = "clang" # Linker to use for the kernel. See also the --kernel-ld command line option. ... The compatibility of -f flags are limited as they can be simply meaningless to Clang. The -m and related flags are supposed to work identically, but Clang may not know about certain options. There are also Clang-only options not known by GCC. CLANG_FLAGS += -Werror=ignored-optimization-argument +CLANG_FLAGS += -mllvm -trap-unreachable KBUILD_CFLAGS += $(CLANG_FLAGS) KBUILD_AFLAGS += $(CLANG_FLAGS) export CLANG_FLAGS ``` There's more I need to do for LTO; `-mllvm` flags need to be passed to the linker in that case. Let me do a few more builds, collect statistics on build size. Over the years, there has been a persistent effort to build the Linux kernel using the Clang C compiler that is part of the LLVM project. We last looked in on the effort in a report from the LLVM microconference at the 2015 Linux Plumbers Conference (LPC), but we have followed it before that as well. At this year's LPC, two Google kernel engineers, Greg Hackmann and Nick Desaulniers, came to. # When clang is used as a linker driver, it does not auto-detect the LTO # bytecode and neither does bfd, so we need to explicitly pass the -flto # flag when linking. Defines the syntax of compiler driver option to pass options to the linker tool. It will be used to translate the LINKER: prefix in the link options (see add_link_options() and target_link_options()).. This variable holds a semicolon-separated list of tokens. If a space (i.e. " ") is specified as last token, flag and LINKER: arguments will be specified as separate arguments to the compiler driver. Clang is a front-end to LLVM that supports C and the GNU C extensions required by the kernel, and is pronounced "klang," not "see-lang." ... instead CROSS_COMPILE is used to set a command line flag: ... CROSS_COMPILE is also used to derive --prefix=<path> to search for the GNU assembler and linker. /b/s/w/ir/k/cipd/ninja -j200 in dir /b/s/w/ir/k/recipe_cleanup/clangv6gSby/llvm_build_dir: allow_subannotations: False base_name: 'clang.build' cmd: ['/b/s/w/ir/k. Hi Team, Attaching relevant files showing the issue. we tried 3 compiler options , attached are the .c file , .ti_compiler_flags.bzl and command.txt file that show how our build behave with each of those options. Clang linker flags The latest version of Clang (267) was released on June 1 2012. There have been 4 updates to Clang since Xcode 4.3.2 has shipped and those updates fix bugs and add better support for blocks. See the Clang release notes. It is really easy to take advantage of these updates on your development machine or on your build servers. Summary. macOS paths usually start with /Users, which clang -cl interprets as a macro undefine, leading to pretty much everything failing to compile . CMake should be taught to put a --. Note: For 32-bit ARM, the compiler is prefixed with armv7a-linux-androideabi, but the binutils tools are prefixed with arm-linux-androideabi.For other. The prefix of the generated linker command still contains the option that I want to change with the default value from that file above, but then contains the option again with the argument that I set in the CMAKE_EXE_FLAGS variable. Clang apparently handles this by overwriting the value, which results in the desired behavior in my case. So. Indeed, in our measurements clang-3.8 compiled faster than gcc versions 4.8 to 5.3 tested, although clang seems to lose it's advantage. However it's an alternative worth considering (your binary might run somewhat slower, but this will impact only projects with strict performance requirements). While improving the documentation (d'oh!) of our home grew obfuscator based on LLVM, we wrote a cheat sheet on clang's hardening features, and some of ld ones. It turns out existing hardening guides generally focus on GCC, while Clang also has an interesting set of hardening features. ... Passing the -Wl,-z,relro flag to the linker marks some. The module.modulemap defines a Clang module for the given target. It basically just says "import the header file in this directory". That header file (cinotify.h) then imports the relevant headers. Given that your library is apparently stored in /usr/local/lib, it will be found on the standard linker search path. As a result, you should only. Solved: I want to integrate video streaming (VideoStream SDK for iOS) to ArcGIS. But there are compiling error: duplicate symbol _ff_inverse in:. Presentation. This document presents the result of the rebuild of the Debian archive (the distribution) with clang, a C/C++ compiler. clang is now ready to build software for production (either for C, C++ or Objective-C). This compiler is providing many more warnings and interesting errors than the gcc suite while not carrying the same legacy. Chrome Linux/Mac clang build very similar to gcc Now trying to do the same on Windows. This is cl.exe. This is clang-cl.exe. This is clang-cl.exe. This is clang-cl.exe. clang-cl in Visual Studio. ... It understands the environment, the flags, and the tools Integrates with Visual Studio. Include path management ¶. Flags controlling how #include s are resolved to files.-I<dir>, /I<dir>, -I<dir>, --include-directory <arg>, --include-directory=<arg>¶ Add directory to include search path. For C++ inputs, if there are multiple -I options, these directories are searched in the order they are given before the standard system directories are searched. The simplest makefile you could create would look something like: Makefile 1. hellomake: hellomake.c hellofunc.c gcc -o hellomake hellomake.c hellofunc.c -I. If you put this rule into a file called Makefile or makefile and then type make on the command line it will execute the compile command as you have written it in the makefile. This script is written in the linker command language. The main purpose of the linker script is to describe how the sections in the input files should be mapped into the output file, and to control the memory layout of the output file. Most linker scripts do nothing more than this. However, when necessary, the linker script can also direct the. Packages describing "lto" as local USE flag. Use link-time optimization for R and its recommended packages. Build with link time optimization (LTO). Enable Link Time Optimization (LTO). Requires Gold linker when using GCC or LDD linker when using Clang. Add support for link-time optimizations. Bootstrapping the Clang toolchain. Mixing Clang and its toolchain / libraries with the GCC toolchain / libraries (especially the linker) will often lead to issues like linker errors during emerges. To prevent this, the Clang toolchain is built first with GCC and then with itself to get a self-providing compiler. The driver prefix and driver separator are given by the values of the CMAKE_<LANG>_LINKER_WRAPPER_FLAG and CMAKE_<LANG>_LINKER_WRAPPER_FLAG_SEP variables. For example, "LINKER:-z,defs" becomes -Xlinker-z-Xlinker defs for Clang and -Wl,-z,defs for GNU GCC. The LINKER: prefix can be specified as part of a SHELL: prefix expression. The. The Visual C++ Linker best practices: Developer Iteration. The time spent in the link phase could be a significant portion of an applications overall build time for most large projects. A user can quickly determine this by adding the '/time' flag to the linker command line. The 'Final: Total time' reports the total time spent in the. compile c++ clang online Language: Ada Assembly Bash C# C++ (gcc) C++ ( clang ) C++ (vc++) C (gcc) C ( clang ) C (vc) Client Side Clojure Common Lisp D Elixir Erlang F# Fortran Go Haskell Java Javascript Kotlin Lua MySql Node.js Ocaml Octave Objective-C Oracle Pascal Perl Php PostgreSQL Prolog Python Python 3 R Rust Ruby Scala Scheme Sql Server. Using Clang with GDB on Windows. In order to make Clang emit DWARF debug symbols that GDB understands, you have to use the LLVM linker so you the full LLVM installation. The following line will compile and link an executable that can be debugged on GDB: clang.exe -O0 -gdwarf -c test.cpp -o test.obj && lld-link -debug test.obj. This script is written in the linker command language. The main purpose of the linker script is to describe how the sections in the input files should be mapped into the output file, and to control the memory layout of the output file. Most linker scripts do nothing more than this. However, when necessary, the linker script can also direct the. The driver prefix and driver separator are given by the values of the CMAKE_<LANG>_LINKER_WRAPPER_FLAG and CMAKE_<LANG>_LINKER_WRAPPER_FLAG_SEP variables. For example, "LINKER:-z,defs" becomes -Xlinker-z-Xlinker defs for Clang and -Wl,-z,defs for GNU GCC. The LINKER: prefix can be specified as part of a SHELL: prefix expression. The. Hi @Kaiserludi So apparently adding -Wl,--copy-dt-needed-entries to the Linker flags solved it 2 days ago · xcodebuild build-for-testing -project ProjectName o ld: symbol(s) not found for architecture x86_64 clang: error: linker co aix; android; darwin; dragonfly 【Swift】Id: framework not found Pods clang: error: linker command failed with. LLVM/Clang/LLD/LLDB - The LLVM Compiler Infrastructure; This is a standalone build, which means this download offers a complete compiler environment for Windows. ... Solution: Add linker flag -lssp somewhere after the source or object files. For example for most projects using autoconf tools just add LIBS="-Wl,--as-needed -lssp" at the end of. Linker This stage runs the target linker to merge multiple object files into an executable or dynamic library. The output of this stage is typically called an "a.out", ".dylib" or ".so" file. The Clang compiler supports a large number of options to control each of these stages. In addition to compilation of code, Clang also supports other tools:. On some targets this option also sets flags for the preprocessor, so it should be used consistently for both compilation and linking. -r. Produce a relocatable object as output. This is also known as partial linking. -rdynamic. Pass the flag -export-dynamic to the ELF linker, on targets that support it. This instructs the linker to add all. A map file can be generated by passing the --print-map > MyMapFile.txt string to LD. In addition the --cref option will print the cross-reference table which is very useful when you want to track down references to symbols. Scrolling down the map file you'll encounter a section named Linker script and memory map. System framework needs to be added to build inputs. And the build process needs some way to communicate where it exists. Generally this done through pkg-config, cmake or another build tool. Generally you can pass additional flags to help it. linker (cross when clang gets it wrong, lld installed somewhere else, some non-sysroot alternative, ld when you have built lld), you'll need a flag. It doesn't really matter if GCC will ever use LLD, but it would be good to have Clang be able to specify which linker to use. We already have library flags, and we don't need an assembler flag, so. Linker command failed (clang-13) Ask Question Asked 1 month ago. ... Well, presumably something is setting -mmacosx-version-min to 10.4 or earlier, so you might start by searching for that flag! Perhaps the build system expects the major version to start with 10.X and is getting confused?. The Visual C++ compiler will not be used at all, but by default we'll link with the VC++ linker (which supports debug symbols) UEBuildWindows. bAllowClangLinker - Turns on the Clang linker (LLD.exe). You can now link UE4 programs with this, but you won't be able to debug in Visual Studio. . Two of the most common Preprocessor Directives are "include" and "define". Using the clang flag "-E", you can compile using only the Preprocessor. example. $ clang -E hello.c. By default, the results of "clang -E" print to standard output (i.e. the monitor). However, the results can easily be saved to a new file: example. LKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH 1/2] kbuild: Hoist '--orphan-handling' into Kconfig @ 2020-11-13 19:55 Nathan Chancellor 2020-11-13 19:55 ` [PATCH 2/2] kbuild: Disable CONFIG_LD_ORPHAN_WARN for ld.lld 10.0.1 Nathan Chancellor ` (5 more replies) 0 siblings, 6 replies; 22+ messages in thread From: Nathan Chancellor @ 2020-11-13 19:55 UTC (permalink. With CMake 3.15 it has become possible to use the Clang compiler on Windows with a GNU-style command line. This also means that it's possible to use Clang with the Mingw-w64 toolchain. While it's possible to configure Clang with the Mingw-w64 (or MinGW) toolchain, if you decide to use Clang from the LLVM repo, it won't work correctly. Summary. Only add CMAKE_EXE_LINKER_FLAGS when in a standalone bulid. Or else CMAKE_EXE_LINKER_FLAGS contains flags for build compiler of Clang/llvm. This might not be the same as what the COMPILER_RT_TEST_COMPILER supports. eg: the build compiler use lld linker and we use it to build clang with. If multiple sections with the o flag are present at link time, the linker ensures that they are in the same order in the image as the sections which define the symbols they reference here. link_order_symbol. and unique unique_id. If the optional argument is provided, then the argument must also be provided.. This table does not list flags for managing an executable stack or the .bss section, under the assumption that these historic features have been phased out by now. Documentation for compiler flags is available in the GCC manual.Those flags (which start with -Wl) are passed to the linker and are described in the documentation for ld.. For some flags, additional explanations are in order:. See the diagnostics reference for a complete list of the warning flags that can be specified in this way. -Wno-foo ¶ Disable warning "foo". -w ¶ Disable all diagnostics. -Weverything ¶ Enable all diagnostics. -pedantic ¶ Warn on language extensions. -pedantic-errors ¶ Error on language extensions. -Wsystem-headers ¶. Linker flags <clang-dxc options> Introduction ¶ This page lists the command line arguments currently supported by the GCC-compatible clang and clang++ drivers. -B<prefix>, --prefix <arg>, --prefix=<arg> ¶ Search $prefix$file for executables, libraries, and data files. If $prefix is a directory, search $prefix/$file -F<arg> ¶. Build flags: Id flags: The output was: 1 C:\MinGW\bin\ld.exe: unrecognised emulation mode: i386pep Supported emulations: i386pe clang.exe: error: linker command failed with exit code 1 (use -v to see invocation) Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.. Mold, a modern drop-in replacement for current Unix linkers, has reached version 1.0. Written by the original creator of the LLVM lld linker, mold aims to be several times faster than its predecessor. [Clang][Docs] Update the clang-linker-wrapper documentation. — jhuber6 / detail [mlir] Add method to populate default attributes ... [Driver] Ignore the clang modules validation-related flags if clang modules are not enabled — kyrtzidis / detail [RISCV] Move some SHXADD matching cases into a ComplexPattern.. Summary. Only add CMAKE_EXE_LINKER_FLAGS when in a standalone bulid. Or else CMAKE_EXE_LINKER_FLAGS contains flags for build compiler of Clang/llvm. This might not be the same as what the COMPILER_RT_TEST_COMPILER supports. eg: the build compiler use lld linker and we use it to build clang with. A linker must be prepared to deal with a mixed set of input files. For example, ... you will need to pass the undocumented -mllvm -emit-codeview-ghash-section flag to clang-cl (this flag should go away in the future, once this is considered stable and good enough to. If you don't want to change the system setting, you can use clang's -fuse-ld option. In this way, you want to set -fuse-ld=lld to LDFLAGS when building your programs. LLD leaves its name and version number to a .comment section in an output. Introduction ¶. This tool works as a wrapper over a linking job. The tool is used to create linked device images for offloading. It scans the linker’s input for embedded device offloading data stored in sections .llvm.offloading.<triple>.<arch> and extracts it as a temporary file. The extracted device files will then be passed to a device linking job to create a final device image. Both GCC and Clang provide a wide range of compiler flags to prevent stack-based attacks. Some of these flags relate to a specific kind of exploit. Others introduce generic protection. And some flags give feedback like warnings and reports to the user, providing a better understanding of the behavior of the stack program. In the first case, it seems to fail because gcc does not recognize the -fmemsafety flag. I don't understand why clang would call GCC to link the program instead of doing it itself. Maybe this is the default behavior under cygwin? ... clang: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation),. . Keywords . Listed below are a selection of significant keywords used within linker scripts. ENTRY ENTRY(main) ENTRY(MultibootEntry) The ENTRY keyword is used for defining the entry point of an application, that being specifically the first executable instruction in the output file. This keyword accepts the symbol name for the entry point of the linked program/kernel as a single argument. LINUX is not a standard CMake variable. If you are defining it yourself, make sure that it is defined to what you expect. Then, you can't pass -latomic -m64 as a single string, since that will be interpreted as attempting to link against a library named atomic -m64.. If you're using CMake 3.13 or later, you should prefer target_link_options for non-library linker flags. Hi @Kaiserludi So apparently adding -Wl,--copy-dt-needed-entries to the Linker flags solved it 2 days ago · xcodebuild build-for-testing -project ProjectName o ld: symbol(s) not found for architecture x86_64 clang: error: linker co aix; android; darwin; dragonfly 【Swift】Id: framework not found Pods clang: error: linker command failed with. This flag controls the linker flavor used by rustc. If a linker is given with the -C linker flag, then the linker flavor is inferred from the value provided. If no linker is given then the linker flavor is used to determine the linker to use. Every rustc target defaults to some linker flavor. Valid options are: em: use Emscripten emcc. gcc: use. arm- cmake - toolchains / clang-arm- gcc - toolchain . cmake Go to file Go to file T; Go to line L; Copy path Copy permalink; This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Cannot retrieve contributors at this time. A: At present CLion supports GCC > > and Clang compilers, MSVC is available in the experimental. Jul 05, 2022 · //Flags used by the linker during Release with Debug Info builds. CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO:STRING= //If set, runtime paths are not added when installing shared libraries,.Understanding Key Criteria For German Dating Sites October 10, 2019. 0. meson build with clang. Nov 07, 2019 · (Before LLVM 9, this is an internal. Sanitizers are open-source tools for dynamic code analysis designed by Google. CLion integrates with the following Sanitizers: Useful links: Official documentation, Sanitizers in Clang, Sanitizers among Program Instrumentation Options in GCC. Sanitizers are implemented in Clang starting 3.1 and GCC starting 4.8. Introduction ¶. This tool works as a wrapper over a linking job. The tool is used to create linked device images for offloading. It scans the linker’s input for embedded device offloading data stored in sections .llvm.offloading.<triple>.<arch> and extracts it as a temporary file. The extracted device files will then be passed to a device linking job to create a final device image. The way I currently deal with this is to find the library header that a function was included from, use Github's search to find some other program that imports that same header, open its makefile, find the linker flags, copy them onto my compilation command, and keep deleting flags until I find a minimal set that still compiles. Listing 5: Second attempt at a cross-compile to iOS. This gets us further, but the compiler now emits a lot of errors along the lines of: 'UIScrollView' is unavailable: not available on Mac OS X Again, clang is trying to generate a Mac OS/X executable when what we want is an iOS executable.The solution is to add:. 1.7 GCC Compilation Process. GCC compiles a C/C++. Error: C Compiler is not able to compile a simple test program and clang-4.0: error: linker command failed with exit code 1 Follow Answered Xh1228. You can see at the Clang - FAQ that clang -cc1 is the frontend. clang is the GCC-compatible driver. And recently, a new driver has appeared, clang-cl, which is a CL-compatible driver. I don't know how to explain clang -cc1 properly but the word that matters is frontend. You should get answers by looking for "compiler frontend", "clang frontend". It is possible to use gcc's linker and libstdc++ implementation when compiling with Clang on Windows. First, you will have to install gcc. ... When compiling, you have to pass some new flags to let clang know that you want to use the "gnu compiler collection" (gcc) instead of msvc. One step compile & link: clang++ -target x86_64-pc-windows-gnu. This flag does not need to be behind 'cc-option' because all > > working versions of Clang support this flag. > > Wouldn't it be better to just define bcmp as an alias for memcmp? They > seem to have compatible prototypes, and then somebody might someday sit > down and implement some word-at-a-time version of bcmp making use of the > weaker. harry potter fanfiction harry runs away from the order; 1965 silver dime value; onnx session; put the sentences in order to make a paragraph; rural carrier transfers. Indeed, in our measurements clang-3.8 compiled faster than gcc versions 4.8 to 5.3 tested, although clang seems to lose it's advantage. However it's an alternative worth considering (your binary might run somewhat slower, but this will impact only projects with strict performance requirements). Targets选项下有Other linker flags的设置,用来填写XCode的链接器参数,如:-ObjC -all_load -force_load等。还记得我们在学习C程序的时候,从C代码到可执行文件经历的步骤是: 源代码 > 预处理器 > 编译器 > 汇编器 > 机器码 > 链接器 > 可执行文件在最后一步需要把.o文件和C语言运行库链. Solved: I want to integrate video streaming (VideoStream SDK for iOS) to ArcGIS. But there are compiling error: duplicate symbol _ff_inverse in:. The linker only sees sections as a black box. --gc-sections tells the linker to track calls into sections and remove unused ones. -Wl,<linker-flag> passes a flag to the linker. With both flags enabled, the linker can construct a call graph for the whole program and remove unused() even when it has external linkage. The AMD Optimizing C/C++ and Fortran Compilers ("AOCC") are a set of production compilers optimized for software performance when running on AMD host processors using the AMD "Zen" core architecture. Supported processor families are AMD EPYC™, AMD Ryzen™, and AMD Ryzen™ Threadripper™ processors. The AOCC compiler environment. -- The C compiler identification is Clang 3.8.0 -- The CXX compiler identification is Clang 3.8.0 -- Check for working C compiler: /usr/bin/clang -- Check for working C compiler: /usr/bin/clang -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done.

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