[Bug gold/18327] New: Exception frame merging is broken in gold

[ian at airs dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18327

            Bug ID: 18327
           Summary: Exception frame merging is broken in gold
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: ian at airs dot com
                CC: ian at airs dot com

Exception frame merging is broken on mainline.  When two CIEs are merged, reloc
processing is not being applied to subsequent CIEs.  This causes the
personality function to not be defined.

Compile these two C++ files without optimization and link them in order.

================================
void
bar()
{
}
================================
#include <iostream>
#include <cstdlib>

void
foo()
{
}

int
main()
{
  try
    {
      throw(1);
    }
  catch(int)
    {
      std::cout << "caught" << std::endl;
      exit(0);
    }
  std::cout << "failed" << std::endl;
  exit(1);
}
===================================

The resulting program, when run, should print "caught".  When I link it with
tip gold, I get

terminate called after throwing an instance of 'int'
Aborted

The reason is that the personality routine in the exception frame info is not
set.  It should have been set by applying relocation processing to the CIE
data.  Note that relocation processing is normally applied *after* EH frame
merging.

I suspect
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=dbe40a889191708b6e32441b1c64937844645574
but I don't know if that is actually the problem.

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