[Bug c/58016] New: stdatomic.h missing in 4.8.1

["jeff.science at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58016

            Bug ID: 58016
           Summary: stdatomic.h missing in 4.8.1
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jeff.science at gmail dot com

GCC 4.8.1 provides a -std=c11 option that defines __STDC_VERSION__ >= 201112L
and does not define __STDC_NO_ATOMICS__, hence is required to provide
stdatomic.h.  This requirement is not met.

This ticket is closely related to 53769 but I am not reporting the fact that
the macros aren't defined, but rather the missing header.

> cat test-c11-atomics.c 
#if __STDC_VERSION__ >= 201112L
# ifdef __STDC_NO_ATOMICS__
#  error Your C11 compiler is not required to provide stdatomic.h
# else
#  include <stdatomic.h>
# endif
#else
# error Your C compiler isn't providing C11.
#endif

int main(int argc, char * argv[])
{
    return 0;
}

> gcc-mp-4.8 -g -Wall -std=c11 test-c11-atomics.c 
test-c11-atomics.c:4:23: fatal error: stdatomic.h: No such file or directory
 #include <stdatomic.h>
                       ^
compilation terminated.

> gcc-mp-4.8 -v
Using built-in specs.
COLLECT_GCC=gcc-mp-4.8
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin11/4.8.1/lto-wrapper
Target: x86_64-apple-darwin11
Configured with: ../gcc-4.8.1/configure --prefix=/opt/local
--build=x86_64-apple-darwin11
--enable-languages=c,c++,objc,obj-c++,lto,fortran,java
--libdir=/opt/local/lib/gcc48 --includedir=/opt/local/include/gcc48
--infodir=/opt/local/share/info --mandir=/opt/local/share/man
--datarootdir=/opt/local/share/gcc-4.8 --with-local-prefix=/opt/local
--with-system-zlib --disable-nls --program-suffix=-mp-4.8
--with-gxx-include-dir=/opt/local/include/gcc48/c++/ --with-gmp=/opt/local
--with-mpfr=/opt/local --with-mpc=/opt/local --with-ppl=/opt/local
--with-cloog=/opt/local --enable-cloog-backend=isl
--disable-cloog-version-check --enable-stage1-checking --disable-multilib
--enable-lto --enable-libstdcxx-time --with-as=/opt/local/bin/as
--with-ld=/opt/local/bin/ld --with-ar=/opt/local/bin/ar
--with-bugurl=https://trac.macports.org/newticket --with-pkgversion='MacPorts
gcc48 4.8.1_0'
Thread model: posix
gcc version 4.8.1 (MacPorts gcc48 4.8.1_0) 

> uname -a
Darwin Jeffs-MacBook-Pro.local 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23
16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64