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  • Simon Ser's avatar
    Define _POSIX_C_SOURCE globally · 842093bb
    Simon Ser authored
    Stop trying to maintain a per-file _POSIX_C_SOURCE. Instead,
    require POSIX.1-2008 globally. A lot of core source files depend
    on that already.
    Some care must be taken on a few select files where we need a bit
    more than POSIX. Some files need XSI extensions (_XOPEN_SOURCE) and
    some files need BSD extensions (_DEFAULT_SOURCE). In both cases,
    these feature test macros imply _POSIX_C_SOURCE. Make sure to not
    define both these macros and _POSIX_C_SOURCE explicitly to avoid
    POSIX requirement conflicts (e.g. _POSIX_C_SOURCE says POSIX.1-2001
    but _XOPEN_SOURCE says POSIX.1-2008).
    Additionally, there is one special case in render/vulkan/vulkan.c.
    That file needs major()/minor(), and these are system-specific.
    On FreeBSD, _POSIX_C_SOURCE hides system-specific symbols so we need
    to make sure it's not defined for this file. On Linux, we can
    explicitly include <sys/sysmacros.h> and ensure that apart from
    symbols defined there the file only uses POSIX toys.