llvm-project/clang/test/Modules/Inputs/MacroFabs1.h


#undef fabs
#define fabs(x) (x)

#undef my_fabs
#define my_fabs(x) (x)
PCH + module: make sure we write out macros associated with builtin identifiers. When we import a module that defines a builtin identifier from prefix header and precompile the prefix header, the macro information related to the identifier is lost. If we don't precompile the prefix header, the source file can still see the macro information. The reason is that we write out the identifier in the pch but not the macro information since the macro is not defined locally. This is related to r251565. In that commit, if we read a builtin identifier from a module that wasn't "interesting" to that module, we will still write it out to a PCH that imports that module. The fix is to write exported module macros for PCH as well. rdar://24666630 Differential Revision: http://reviews.llvm.org/D20383 llvm-svn: 271310 2016-06-01 02:19:32 +08:00
			`#undef fabs`
			`#define fabs(x) (x)`

			`#undef my_fabs`
			`#define my_fabs(x) (x)`