[Bug c/40880] New: stdarg.h does not define va_copy when building for C89+POSIX

["bmerry at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

POSIX 2001 specifies that va_copy
(http://www.opengroup.org/onlinepubs/009695399/functions/va_copy.html) is
defined by stdarg.h. However, when compiling with -std=c89
-D_POSIX_C_SOURCE=200112L this does not happen. I've encountered this in 4.3.2,
but a quick peek in svn makes it look this this is current.

I'll attach the source and preprocessed output.

Command line:
gcc -std=c89 -D_POSIX_C_SOURCE=200112L -Wall -c no_va_copy.c -save-temps
no_va_copy.c: In function ?copy_va_list?:
no_va_copy.c:8: warning: implicit declaration of function ?va_copy?

gcc -v:
Using built-in specs.
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-4.3.2-r3/work/gcc-4.3.2/configure --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.3.2
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --enable-nls --without-included-gettext
--with-system-zlib --disable-checking --disable-werror --enable-secureplt
--enable-multilib --enable-libmudflap --disable-libssp --enable-libgomp
--disable-libgcj --enable-languages=c,c++,treelang,fortran --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.3.2-r3 p1.6,
pie-10.1.5'
Thread model: posix
gcc version 4.3.2 (Gentoo 4.3.2-r3 p1.6, pie-10.1.5)


-- 
           Summary: stdarg.h does not define va_copy when building for
                    C89+POSIX
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bmerry at gmail dot com
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40880