[flang][CMake] CYGWIN requires _GNU_SOURCE to be defined. #66747
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Compiling flang on CYGWIN prints this error message on the console:
llvm-project/flang/include/flang/Parser/char-block.h: In member function ‘std::string Fortran::parser::CharBlock::NULTerminatedToString() const’:
llvm-project/flang/include/flang/Parser/char-block.h:106:26: error: ‘strnlen’ was not declared in this scope; did you mean ‘strlen’?
106 | /*not in std::*/ strnlen(interval_.start(), interval_.size())};
| ^~~~~~~
| strlen
strnlen() exists into NEWLIB, but it requires to define _GNU_SOURCE macro somewhere for having its prototype available.
This patch adds this definition, by using the same code written here:
https://github.com/llvm/llvm-project/blob/53602e6193d98b1e814b76a27e99ef7e18c9769c/third-party/benchmark/CMakeLists.txt#L230
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Compiling flang on CYGWIN prints this error message on the console:
strnlen()exists into NEWLIB, but it requires to define_GNU_SOURCEmacro somewhere for having its prototype available.This patch adds this definition, by using the same code written here:
llvm-project/third-party/benchmark/CMakeLists.txt
Line 230 in 53602e6