forked from OSchip/llvm-project
797004d2ea
The clang-cl driver disables access to command line options outside of the "Core" and "CLOption" sets of command line arguments. This filtering makes it impossible to pass arguments that are interpreted by the clang driver and not by either 'cc1' (the frontend) or one of the other tools invoked by the driver. An example driver-level flag is the '-fno-slp-vectorize' flag, which is processed by the driver in Clang::ConstructJob and used to set the cc1 flag "-vectorize-slp". There is no negative cc1 flag or -mllvm flag, so it is not currently possible to disable the SLP vectorizer from the clang-cl driver. This change introduces the "/clang:" argument that is available when the driver mode is set to CL compatibility. This option works similarly to the "-Xclang" option, except that the option values are processed by the clang driver rather than by 'cc1'. An example usage is: clang-cl /clang:-fno-slp-vectorize /O2 test.c Another example shows how "/clang:" can be used to pass a flag where there is a conflict between a clang-cl compat option and an overlapping clang driver option: clang-cl /MD /clang:-MD /clang:-MF /clang:test_dep_file.dep test.c In the previous example, the unprefixed /MD selects the DLL version of the msvc CRT, while the prefixed -MD flag and the -MF flags are used to create a make dependency file for included headers. One note about flag ordering: the /clang: flags are concatenated to the end of the argument list, so in cases where the last flag wins, the /clang: flags will be chosen regardless of their order relative to other flags on the driver command line. Patch by Neeraj K. Singh! Differential revision: https://reviews.llvm.org/D53457 llvm-svn: 346393 |
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| cmake | ||
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| include | ||
| lib | ||
| runtime | ||
| test | ||
| tools | ||
| unittests | ||
| utils | ||
| www | ||
| .arcconfig | ||
| .clang-format | ||
| .clang-tidy | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| INSTALL.txt | ||
| LICENSE.TXT | ||
| ModuleInfo.txt | ||
| NOTES.txt | ||
| README.txt | ||
README.txt
//===----------------------------------------------------------------------===// // C Language Family Front-end //===----------------------------------------------------------------------===// Welcome to Clang. This is a compiler front-end for the C family of languages (C, C++, Objective-C, and Objective-C++) which is built as part of the LLVM compiler infrastructure project. Unlike many other compiler frontends, Clang is useful for a number of things beyond just compiling code: we intend for Clang to be host to a number of different source-level tools. One example of this is the Clang Static Analyzer. If you're interested in more (including how to build Clang) it is best to read the relevant web sites. Here are some pointers: Information on Clang: http://clang.llvm.org/ Building and using Clang: http://clang.llvm.org/get_started.html Clang Static Analyzer: http://clang-analyzer.llvm.org/ Information on the LLVM project: http://llvm.org/ If you have questions or comments about Clang, a great place to discuss them is on the Clang development mailing list: http://lists.llvm.org/mailman/listinfo/cfe-dev If you find a bug in Clang, please file it in the LLVM bug tracker: http://llvm.org/bugs/