Port to IRIX 6.5.
This port requires IRIX cc, as I did not have time to get undump working with the old GCC on the system I had access to, but that's better than nothing. * configure.ac (gl_GCC_VERSION_IFELSE): Remove unused macro that wouldn't have worked anyway, with IRIX cc. (emacs_cv_clang, emacs_cv_sanitize_address) (ns_osx_have_104, ns_osx_have_105): Don't assume '#error' makes the compiler fail, as this doesn't work with IRIX cc. (CFLAGS, LIBS): Don't let the GnuTLS results infect later 'configure' checks. This runs afoul of an IRIX configuration where GnuTLS is in an optional library that also contains getdelim, and causes a later 'configure' to incorrectly think getdelim is supported. * src/alloc.c (TAGGABLE_NULL): New constant, for porting to hosts with nontrivial DATA_SEG_BITS settings. (next_vector, set_next_vector): Use it. * src/conf_post.h (INET6) [IRIX6_5]: Define. (HAVE_GETADDRINFO) [IRIX6_5]: Undef. * src/data.c (BITS_PER_ULL): Don't assume ULLONG_MAX is defined. * src/lisp.h (lisp_h_XPNTR): Don't OR in bits that aren't masked out, for consistency with how TAGGABLE_NULL is computed. Fixes: debbugs:9684
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