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[Bug libgcc/74748] New: libgcc_s.so.1 isn't created correctly for Blackfin FDPIC


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=74748

            Bug ID: 74748
           Summary: libgcc_s.so.1 isn't created correctly for Blackfin
                    FDPIC
           Product: gcc
           Version: 6.1.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: libgcc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wbx at openadk dot org
  Target Milestone: ---

When building a cross-compiler for Blackfin with gcc 6.1.0 the resulting
libgcc_s.so.1
isn't exporting the _Unwind* and ___emutls_get_address functions correctly.
All symbols are LOCAL instead of being GLOBAL, so any application (for example
any C++
application) can not be linked as the _Unwind* functions for exception handling
are
missing.

Binutils was fixed to handle the user prefix (_) in Blackfin correctly:
https://sourceware.org/ml/binutils/2010-12/msg00356.html

Unfortunately the required change in GCC was never made.

See here for a longer discussion about the problem on the gcc-help mailinglist:
http://www.spinics.net/lists/gcchelp/msg45573.html

I tried to fix the generation of libgcc.map (the linker version script) but
failed.

I think it might be a simple task for an experienced GCC developer.
I can test any patch if you want.

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