missing preprocessor definitions in LLVM_CFLAGS/LLVM_CXXFLAGS

[llvmbot]

Bugzilla Link	3882
Resolution	FIXED
Resolved on	Feb 22, 2010 12:56
Version	2.5
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@asl,@oscarfv

Extended Description

In order to be able to compile something using the LLVM header files it is neccessary (at least on GCC + GNU/Linux) that some preprocessor definitions are included:

-D_GNU_SOURCE -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS

When using the autoconf-based build system in LLVM 2.4 these where properly defined. With the cmake-based system (which is otherwise very good and integrates nicely in OpenEmbedded) these definitions are missing causing build errors in projects that compile against the LLVM headers.

[llvmbot]

My temporary workaround is to patch the respective CMakeFile.txt to include those CFLAGS/CXXFLAGS in the generated llvm-config.

I think a proper fix that works on all targets would make this dependent on the compiler being used.

[oscarfv]

r68428 sets LLVM_CFLAGS and LLVM_CXXFLAGS so -cflags and -cxxflags works with llvm-config.

It detects glibc and sets _GNU_SOURCE too.