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c136213d46
Without #define _XOPEN_SOURCE macports clang 9.0.1 on OSX 10.7.5 was
giving me
In file included from swapcontext.c:12:
/usr/include/ucontext.h:43:2: error: The deprecated ucontext routines require
_XOPEN_SOURCE to be defined
^
swapcontext.
So I added #define _XOPEN_SOURCE
But that gives, on Solaris 11.3
In file included from /usr/include/limits.h:12:0,
from /usr/gcc/4.8/lib/gcc/i386-pc-solaris2.11/4.8.2/include-fixed/limits.h:168,
from /usr/gcc/4.8/lib/gcc/i386-pc-solaris2.11/4.8.2/include-fixed/syslimits.h:7,
from /usr/gcc/4.8/lib/gcc/i386-pc-solaris2.11/4.8.2/include-fixed/limits.h:34,
from swapcontext.c:7:
/usr/include/sys/feature_tests.h:354:2: error: #error "Compiler or options invalid for pre-UNIX 03 X/Open applications and pre-2001 POSIX applications"
#error "Compiler or options invalid for pre-UNIX 03 X/Open applications \
^
So make the #define _XOPEN_SOURCE conditional on darwin.