http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
--- Comment #4 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> 2012-06-26 05:17:31 UTC --- (In reply to comment #3) > Such a test is not meaningful for documented incomplete support; in the > absence of claims of conformance, __STDC_VERSION__ can only be interpreted > as a statement of intent OK, this makes clear that for portability, programs should do configure tests instead of relying on the values of standard macros. I think this should be documented in the GCC manual (I haven't checked the latest versions, but there were/are similar problems with C99). > (The code you give should be rejected if __STDC_NO_THREADS__ is not > defined, because of the constraint in 6.7.1#3: "In the declaration of an > object with block scope, if the declaration specifiers include > _Thread_local, they shall also include either static or extern.".) Oops, yes, I did a mistake when copying the code: the declaration should have been outside main().
