[MacPorts] #67248: grep @3.10 is broken on Tiger: error: expected '=', ',', '; ', 'asm' or '__attribute__' before 'mcontext64_t'

[MacPorts]

#67248: grep @3.10 is broken on Tiger: error: expected '=', ',', ';', 'asm' or
'__attribute__' before 'mcontext64_t'
---------------------------+-------------------------
  Reporter:  barracuda156  |      Owner:  Schamschula
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  tiger
      Port:  grep          |
---------------------------+-------------------------

Comment (by Cebtenzzre):

 Same issue with coreutils @9.3 on Tiger:
 {{{
 :info:build /opt/local/bin/gcc-apple-4.2 -std=gnu99  -I. -I./lib  -Ilib
 -I./lib -Isrc -I./src -I/opt/local/include   -Wno-cast-qual -Wno-
 conversion -Wno-float-equal -Wno-sign-compare -Wno-undef -Wno-unused-
 function -Wno-unused-parameter -pipe -Os -arch i386 -MT lib
 /libcoreutils_a-version-etc-fsf.o -MD -MP -MF lib/.deps/libcoreutils_a-
 version-etc-fsf.Tpo -c -o lib/libcoreutils_a-version-etc-fsf.o `test -f
 'lib/version-etc-fsf.c' || echo './'`lib/version-etc-fsf.c
 :info:build mv -f lib/.deps/libcoreutils_a-unsetenv.Tpo lib/.deps
 /libcoreutils_a-unsetenv.Po
 :info:build In file included from /usr/include/sys/wait.h:110,
 :info:build                  from ./lib/sys/wait.h:28,
 :info:build                  from /usr/include/stdlib.h:64,
 :info:build                  from ./lib/stdlib.h:36,
 :info:build                  from lib/verror.c:26:
 :info:build /usr/include/sys/signal.h:145: error: expected '=', ',', ';',
 'asm' or '__attribute__' before 'mcontext64_t'
 :info:build /usr/include/sys/signal.h:177: error: expected '=', ',', ';',
 'asm' or '__attribute__' before 'ucontext64_t'
 }}}

 gcc 7 and clang-mp-3.4 give an {{{unknown type name
 '__darwin_mcontext64_t'}}} error instead.

 {{{mcontext64_t}}} is defined like this in sys/signal.h:
 {{{
 #ifndef _POSIX_C_SOURCE
 #ifndef _MCONTEXT64_T
 #define _MCONTEXT64_T
 typedef __darwin_mcontext64_t       mcontext64_t;
 #endif
 #endif /* _POSIX_C_SOURCE */
 }}}

 {{{__darwin_mcontext64_t}}} is defined like this in sys/_types.h:
 {{{
 #ifndef _POSIX_C_SOURCE
 typedef struct mcontext *__darwin_mcontext_t;   /* [???] machine context
 */
 typedef struct mcontext64 *__darwin_mcontext64_t; /* [???] machine context
 */
 #else /* _POSIX_C_SOURCE */
 typedef struct __darwin_mcontext *__darwin_mcontext_t; /* [???] machine
 context */
 #endif /* _POSIX_C_SOURCE */
 }}}

 I can reproduce the problem with this simple C source:
 {{{
 #define _POSIX_C_SOURCE 200112L
 #include <sys/types.h>
 #undef _POSIX_C_SOURCE
 #include <sys/signal.h>
 }}}

 gnulib commit
 [https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commitdiff;h=b1d7d87cb9683e6f0dcef5bb8b6583cac0be8748;hp=e3bf6b879e075d18fcc5af41159a1e2b2c347dd4
 b1d7d87c] ("stdio: suppress macOS 13 sprintf warnings") from March 5th
 performs a similar define/undef so I bet that's the problem. The OS X 10.5
 SDK from Xcode 3.1.4 looks immune to this because it uses a
 {{{__need_mcontext64_t}}} macro and defines the types in architecture-
 specific headers.

 gnulib considers OS X 10.4 to be a "formerly supported platform", so I'm
 not sure if this is a valid upstream issue.

-- 
Ticket URL: <https://trac.macports.org/ticket/67248#comment:6>
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