698400bfb9
When running ld -r on objects that have comdat groups, when gold deduplicates a function in a comdat group, it removes the relocations from the EH information that referred to the dropped copy of the function. When running a final link using the result of the -r link, the missing relocation cause it to fail to recognize the FDE for the dropped function. This patch improves gold's FDE scanning to take into account the possibility that an FDE corresponds to a dropped function, and drops that FDE as well. Gnu ld, on the other hand, leaves the relocations in the ld -r output, but makes them R_NONE with an r_sym field of 0. This was sufficient to let both linkers recognize the FDE properly. With this fix, if you do an ld -r with gold, then do the final link with Gnu ld, the .eh_frame_hdr section will not be generated. To make it work with Gnu ld, we would have to leave the R_NONE relocations in, but I think it's better to drop the relocations entirely. I'd hope that if you're doing a -r link with gold, you'll also do the final link with gold. gold/ PR gold/19002 * ehframe.cc (Eh_frame::read_fde): Check for dropped functions. * testsuite/Makefile.am (eh_test_2): New test. * testsuite/Makefile.in: Regenerate. * testsuite/eh_test_2.sh: New test script. * testsuite/eh_test_a.cc (bar): Make it comdat. * testsuite/eh_test_b.cc (bar): Add a duplicate copy.
37 lines
1.2 KiB
Bash
Executable file
37 lines
1.2 KiB
Bash
Executable file
#!/bin/sh
|
|
|
|
# eh_test_2.sh -- check that .eh_frame_hdr is valid.
|
|
|
|
# Copyright (C) 2016 Free Software Foundation, Inc.
|
|
# Written by Cary Coutant <ccoutant@gmail.com>.
|
|
|
|
# This file is part of gold.
|
|
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program; if not, write to the Free Software
|
|
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
|
# MA 02110-1301, USA.
|
|
|
|
sections="eh_test_2.sects"
|
|
|
|
hdr_section=`fgrep .eh_frame_hdr $sections`
|
|
size_field=`echo $hdr_section | sed -e 's/\[//' | awk '{print $6;}'`
|
|
size=`printf %d "0x$size_field"`
|
|
|
|
if test "$size" -le 8; then
|
|
echo ".eh_frame_hdr section is too small:"
|
|
echo "$hdr_section"
|
|
exit 1
|
|
fi
|
|
|
|
exit 0
|