[Bug middle-end/46790] New: [4.6 regression] EH failures in libstdc++ testsuite with --gc-sections and GNU ld 2.18

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46790

           Summary: [4.6 regression] EH failures in libstdc++ testsuite
                    with --gc-sections and GNU ld 2.18
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: major
          Priority: P3
         Component: middle-end
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: ja...@gcc.gnu.org
                CC: hubi...@gcc.gnu.org
            Target: x86_64-unknown-linux-gnu


Starting with r167085, test runs on gcc10.fsffrance.org have had a bunch of
failures in the libstdc++ testsuite; the testcases fail with calls to
terminate() because exceptions are not handled properly.  This seems to be due
to .gcc_except_table being thrown away by --gc-sections, which in turn seems to
be due to the change in the name of text subsections; .text.startup.main no
longer matches .gcc_except_table.main, so the heuristic that ld 2.18 uses to
keep .gcc_except_table hunks breaks.

One test that fails is 18_support/uncaught_exception/14026.cc.