[llvm-bugs] [Bug 23951] __has_include not reported by "clang -dM -E - < /dev/null"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=23951

Fangrui Song <i at maskray.me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |i at maskray.me
         Resolution|---                         |WONTFIX
             Status|NEW                         |RESOLVED

--- Comment #3 from Fangrui Song <i at maskray.me> ---
> I'm leaning towards saying that this is a GCC-specific behaviour we don't want to reproduce.

+1

--- a/gcc/c-family/c-cppbuiltin.c
+++ b/gcc/c-family/c-cppbuiltin.c
@@ -787,18 +787,66 @@ c_cpp_builtins (cpp_reader *pfile)
   /* For stddef.h.  They require macros defined in c-common.c.  */
   c_stddef_cpp_builtins ();

+  /* Set include test macros for all C/C++ (not for just C++11 etc.)
+     the builtins __has_include__ and __has_include_next__ are defined
+     in libcpp.  */
+  cpp_define (pfile, "__has_include(STR)=__has_include__(STR)");
+  cpp_define (pfile, "__has_include_next(STR)=__has_include_next__(STR)");
+

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