http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47902
--- Comment #4 from Daniel Richard G. <skunk at iskunk dot org> 2011-02-28 21:59:28 UTC --- Okay, did some more digging. So I see that the ac_fn_c_check_type function actually tries a test compilation first with sizeof(foo_t), and then sizeof((foo_t)), and the test succeeds only if the first succeeds and the latter fails. So this is actually working as it should---I'd missed that the test log I pasted in shows pid_t being found successfully. The real test failure in config.log is as follows: configure:5203: checking for pid_t configure:5203: /tmp/gcc-4.5.2-build/./prev-gcc/xgcc -B/tmp/gcc-4.5.2-build/./prev-gcc/ -B/opt/tg/powerpc-ibm-aix4.3.2.0/bin/ -B/opt/tg/powerpc-ibm-aix4.3.2.0/bin/ -B/opt/tg/powerpc-ibm-aix4.3.2.0/lib/ -isystem /opt/tg/powerpc-ibm-aix4.3.2.0/include -isystem /opt/tg/powerpc-ibm-aix4.3.2.0/sys-include -c -g -O2 conftest.c >&5 In file included from conftest.c:71:0: /tmp/gcc-4.5.2-build/./prev-gcc/include/stdint.h:72:29: error: conflicting types for 'int_fast16_t' /usr/include/sys/inttypes.h:143:18: note: previous declaration of 'int_fast16_t' was here /tmp/gcc-4.5.2-build/./prev-gcc/include/stdint.h:75:29: error: conflicting types for 'uint_fast8_t' /usr/include/sys/inttypes.h:145:18: note: previous declaration of 'uint_fast8_t' was here /tmp/gcc-4.5.2-build/./prev-gcc/include/stdint.h:76:30: error: conflicting types for 'uint_fast16_t' /usr/include/sys/inttypes.h:146:18: note: previous declaration of 'uint_fast16_t' was here configure:5203: $? = 1 Which is basically bug #47907. I notice that the test for pid_t fails if HAVE_STDINT_H is #defined, and succeeds otherwise.
