[Bug bootstrap/44107] New: libstdc++ (dylib) is built with an erroneous dependency towards /usr/lib

[Denis dot Excoffier at airbus dot com]

The symptoms are that for some inputs, my C++ program gets stuck after a
`throw' and before the corresponding `catch', with CPU running. With an
appropriate DYLD_LIBRARY_PATH, the problem disappears.

The problem comes IMHO from libgcc/config/t-slibgcc-darwin (lines 29-35) where
libgcc_s.10.5.dylib is _not_ built. Therefore it remains absent from
$(objdir)/gcc. However, in the `specs' located in this directory, it is
referenced from within the `*libgcc:' target (see also lines 400 and 405 of
gcc/config/darwin.h). Consequently, libstdc++.6.dylib contains a dependency
towards /usr/lib/libgcc_s.10.5.dylib (see line 577 of
libstdc++-v3/src/Makefile.in, /usr/lib is a default directory), and this
dependency remains in my C++ executable (dynamically linked). The symptoms
follow (see explanations under the description of the option `-shared-libgcc'
of GCC).

I modified libgcc/config/t-slibgcc-darwin in order to build libgcc_s.10.5.dylib
in all cases and everything is now perfect. Perhaps a better solution would be
to remove the -lgcc_s.10.5 from the build of libstdc++.6.dylib.

Hope this helps. I grabbed the 4.5-20100506 snapshot and found no change in
this area. All the above lines and files are from the 4.5.0 distribution.


-- 
           Summary: libstdc++ (dylib) is built with an erroneous dependency
                    towards /usr/lib
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: Denis dot Excoffier at airbus dot com
 GCC build triplet: powerpc-apple-darwin9.8.0
  GCC host triplet: powerpc-apple-darwin9.8.0
GCC target triplet: powerpc-apple-darwin9.8.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44107