/usr/src/gcc-8/debian/patches/gcc-as-needed-push-pop.diff is in gcc-8-source 8-20180414-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | From: Jakub Jelinek <jakub@redhat.com>
Subject: [PATCH] Use --push-state --as-needed and --pop-state instead of --as-needed and --no-as-needed for libgcc
As discussed, using --as-needed and --no-as-needed is dangerous, because
it results in --no-as-needed even for libraries after -lgcc_s, even when the
default is --as-needed or --as-needed has been specified earlier on the
command line.
If the linker supports --push-state/--pop-state, we should IMHO use it.
2018-04-11 Jakub Jelinek <jakub@redhat.com>
* configure.ac (LD_AS_NEEDED_OPTION, LD_NO_AS_NEEDED_OPTION): Use
--push-state --as-needed and --pop-state instead of --as-needed and
--no-as-needed if ld supports it.
* configure: Regenerated.
--- a/src/gcc/configure.ac
+++ b/src/gcc/configure.ac
@@ -5517,11 +5517,21 @@ if test $in_tree_ld = yes ; then
if test "$gcc_cv_gld_major_version" -eq 2 -a "$gcc_cv_gld_minor_version" -ge 16 -o "$gcc_cv_gld_major_version" -gt 2 \
&& test $in_tree_ld_is_elf = yes; then
gcc_cv_ld_as_needed=yes
+ if test "$gcc_cv_gld_major_version" -eq 2 -a "$gcc_cv_gld_minor_version" -ge 28; then
+ gcc_cv_ld_as_needed_option='--push-state --as-needed'
+ gcc_cv_ld_no_as_needed_option='--pop-state'
+ fi
fi
elif test x$gcc_cv_ld != x; then
# Check if linker supports --as-needed and --no-as-needed options
if $gcc_cv_ld --help 2>&1 | grep as-needed > /dev/null; then
gcc_cv_ld_as_needed=yes
+ if $gcc_cv_ld --help 2>&1 | grep push-state > /dev/null; then
+ if $gcc_cv_ld --help 2>&1 | grep pop-state > /dev/null; then
+ gcc_cv_ld_as_needed_option='--push-state --as-needed'
+ gcc_cv_ld_no_as_needed_option='--pop-state'
+ fi
+ fi
fi
case "$target:$gnu_ld" in
*-*-solaris2*:no)
|