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4e310e78cb
The list of macros documented as being defined by AC_USE_SYSTEM_EXTENSIONS had gotten out of sync with the actual list. Update it thoroughly. Also, I introduced an error into the commentary when I merged Julien ÉLIE’s patch to define _NETBSD_SOURCE and _OPENBSD_SOURCE in AC_USE_SYSTEM_EXTENSIONS. _OPENBSD_SOURCE does something on NetBSD and *doesn’t* do anything on OpenBSD. This is corrected. Clean up the code in AC_USE_SYSTEM_EXTENSIONS a bit while I’m in there; we now had a redundant definition of _NETBSD_SOURCE (one unconditional and one conditional on minix/config.h existing). Reorganize the macro to make it easier to catch problems like this in the future. * lib/autoconf/specific.m4 (AC_USE_SYSTEM_EXTENSIONS): Reorganize; remove redundant AC_DEFINE of _NETBSD_SOURCE; add some missing AC_BEFOREs; use _AC_CHECK_HEADER_ONCE for header checks; revise all commentary. * doc/autoconf.texi (AC_USE_SYSTEM_EXTENSIONS): Update. |
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