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0a36880ad1
Running "maintainer-release-check" on OS X with Clang 2.9 fails, because "clang-mp-2.9 -o test -g test.c" launches "/usr/bin/dsymutil test -o test.dSYM" which fails with "error: unable to open executable '-o'". * m4/c-working.m4 (BISON_CHECK_WITH_POSIXLY_CORRECT) (BISON_C_COMPILER_POSIXLY_CORRECT): New. * configure.ac: Use the latter. * tests/atlocal.in (POSIXLY_CORRECT_IS_EXPORTED): New. * tests/local.at (AT_BISON_CHECK_WARNINGS_): Use it instead of computing its value each time. (AT_QUELL_VALGRIND): Skip tests that cannot work because of compilers that do not support POSIXLY_CORRECT.