[bug #34692] if multiple libobjc's exist, the use of AC_CHECK_FUNCS for checking functions in libobjc can give wrong results

[Eric Wasylishen]

URL:
  <http://savannah.gnu.org/bugs/?34692>

                 Summary: if multiple libobjc's exist, the use of
AC_CHECK_FUNCS for checking functions in libobjc can give wrong results
                 Project: GNUstep
            Submitted by: ericw
            Submitted on: Sun 30 Oct 2011 06:46:44 AM GMT
                Category: Base/Foundation
                Severity: 2 - Minor
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I'm trying to build gnustep-base 1.23.0 on Mac OS 10.7. I am using the
macports-gcc-4.4 compiler and its objc runtime.

The AC_CHECK_FUNCS configure macros testing for functions in libobjc are
finding functions in Apple's libobjc (objc_setProperty, _Block_copy) which my
gcc libobjc doesn't have. This messes up the compilation later, because base
thinks it will be linked agains a libobjc which has these modern features, but
I end up linking it against the gcc 4.4 libobjc.

I think this can be fixed by creating test programs (like the tests in
config/config.*.m) for these features, and avoiding the use of AC_CHECK_FUNCS
for testing for functions in libobjc.




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