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=40879
