forked from OSchip/llvm-project
e7228062b2
Standard C allows all standard headers to declare macros for all their functions. So after possibly including any standard header like <ctype.h>, it's perfectly normal for any and all of the functions it declares to be defined as macros. Standard C requires explicit `#undef` before using that identifier in a way that is not compatible with function-like macro definitions. The C standard's rules for this are extended to POSIX as well for the interfaces it defines, and it's the expected norm for nonstandard extensions declared by standard C library headers too. So far the only place this has come up for llvm-libc's code is with the isascii function in Fuchsia's libc. But other cases can arise for any standard (or common extension) function names that source code in llvm-libc is using in nonstandard ways, i.e. as C++ identifiers. The only correct and robust way to handle the possible inclusion of standard C library headers when building llvm-libc source code is to use `#undef` explicitly for each identifier before using it. The easy and obvious place to do that is in the per-function header. This requires that all code, such as test code, that might include any standard C library headers, e.g. via utils/UnitTest/Test.h, make sure to include those *first* before the per-function header. This change does that for isascii and its test. But it should be done uniformly for all the code and documented as a consistent convention so new implementation files are sure to get this right. Reviewed By: sivachandra Differential Revision: https://reviews.llvm.org/D94642 |
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| AOR_v20.02 | ||
| benchmarks | ||
| cmake/modules | ||
| config | ||
| docs | ||
| fuzzing | ||
| include | ||
| lib | ||
| loader | ||
| spec | ||
| src | ||
| test | ||
| utils | ||
| CMakeLists.txt | ||
| LICENSE.txt | ||
| README.txt | ||
README.txt
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.