build: add -D_POSIX_C_SOURCE=200809L #55
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Without this, clang-3.8 with -std=c99 on Ubuntu 16.04 fails to find SSIZE_MAX
in limits.h. This is because SSIZE_MAX is in .../bits/posix1_lim.h, and
/usr/include/limits.h contains:
#ifdef __USE_POSIX
/* POSIX adds things to <limits.h>. */
# include <bits/posix1_lim.h>
#endif
and in "__STRICT_ANSI__" mode (implied by -std=c99, amongst other things),
__USE_POSIX is only defined if we've defined _POSIX_C_SOURCE or _XOPEN_SOURCE.
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Without this, clang-3.8 with -std=c99 on Ubuntu 16.04 fails to find SSIZE_MAX
in limits.h. This is because SSIZE_MAX is in .../bits/posix1_lim.h, and
/usr/include/limits.h contains:
and in "STRICT_ANSI" mode (implied by -std=c99, amongst other things),
__USE_POSIX is only defined if we've defined _POSIX_C_SOURCE or _XOPEN_SOURCE.