kc3-lang/gnulib

2015-01-05T14:08:27

stdio: fix use of PRIdMAX on modern mingw Commit cf88e56ab broke the use of PRIdMAX and friends on modern mingw64 installations. Basically, when requesting _USE_MINGW_ANSI_STDIO, not only does mingw turn on support for %lld, it also rewrites <inttypes.h> to provide PRIdMAX as "lld" instead of "I64d" (but only when <stdio.h> is also included). But if a user is NOT using the gnulib printf module, gnulib's <stdio.h> was still giving printf() the system printf attribute, which causes the compiler to then complain about an unknown %lld specifier, even though we know we don't need to use the non-standard %I64d. So this patch adds a configure-time probe that should work with older gcc (which does not differentiate between printf flavors) and older mingw (where _USE_MINGW_ANSI_STDIO has no impact on behavior), while fixing the mismatch in flavors on modern systems. * m4/stdio_h.m4 (gl_STDIO_H): Probe for printf flavor via inttypes. * lib/stdio.in.h (_GL_ATTRIBUTE_FORMAT_PRINTF_SYSTEM): Use result to work with modern mingw. Signed-off-by: Eric Blake <eblake@redhat.com>