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From: "michael at talamasca dot ocis.net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgcc/55589] New: Failure compiling "generic-morestack-thread.c", without threads
Date: Tue, 04 Dec 2012 09:15:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55589

             Bug #: 55589
           Summary: Failure compiling "generic-morestack-thread.c",
                    without threads
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcc
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: michael@talamasca.ocis.net


Stock GCC 4.7.2 fails to build itself on my uClibc system, stopping at the file
"generic-morestack-thread.c":

/home/source/gcc-4.7.2/libgcc/generic-morestack-thread.c:41:21: fatal error:
pthread.h: No such file or directory
compilation terminated.
make[3]: *** [generic-morestack-thread.o] Error 1
make[3]: Leaving directory
`/home/test/build/gcc-build/i386-pc-linux-uclibc/libgcc'
make[2]: *** [all-stage1-target-libgcc] Error 2
make[2]: Leaving directory `/home/test/build/gcc-build'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/home/test/build/gcc-build'
make: *** [all] Error 2

"pthread.h" is indeed missing, as I have compiled uClibc without threading
support.  GCC's build system fails to realize that that file shouldn't be built
in this case.

I've been dealing with this problem myself by simply changing "ifndef
inhibit_libc" to simply "if 0".  I haven't noticed any negative consequences
from this hack.