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From: "howarth at nitro dot med.uc.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9
Date: Thu, 25 Oct 2012 13:47:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #13 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-25 13:47:21 UTC ---
% grep Unwind_GetIPInfo 
/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h
% extern _Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *);

% grep Unwind_GetIPInfo 
/usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include/unwind.h
%

FYI, the original configure test for _Unwind_GetIPInfo was added in this
PR26792...

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26792#c11

I think this is a latent issue created by this commit...

r141804 | sje | 2008-11-12 16:35:46 -0500 (Wed, 12 Nov 2008) | 9 lines

        PR  target/27880

        * config/unwind_ipinfo.m4 (GCC_CHECK_UNWIND_GETIPINFO): Change from
        link test to target based test.
        * libstdc++/v3/configure.ac: Move call to GCC_CHECK_UNWIND_GETIPINFO.
        * libstdc++/v3/configure: Regenerate.
        * libjava/configure: Regenerate.

which doesn't take in account that on darwin9 only the gcc-4.2.1 compiler
provides _Unwind_GetIPInfo  through
/usr/lib/gcc/powerpc-apple-darwin9/4.2.1/include/unwind.h. This is a broken
test since gcc-4.2.1 isn't the default system compiler on
powerpc-apple-darwin9.