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Always keep sections marked with SEC_KEEP 

SEC_KEEP check in elf_gc_sweep was missing in commit:

commit bde6f3eb6d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Jan 8 01:43:23 2010 +0000

    Set SEC_KEEP on section XXX for undefined __start_XXX/__stop_XXX

    bfd/

    2010-01-07  H.J. Lu  <hongjiu.lu@intel.com>

      PR ld/11133
      * elflink.c (_bfd_elf_gc_mark_hook): Check section XXX for
      undefined __start_XXX/__stop_XXX in all input files and set
      SEC_KEEP.

This patch adds SEC_KEEP check to elf_gc_sweep.

bfd/

	PR ld/19161
	* elflink.c (elf_gc_sweep): Always keep sections marked with
	SEC_KEEP.

ld/testsuite/

	PR ld/19161
	* ld-gc/gc.exp: Run pr19161 test.
	* ld-gc/pr19161-1.c: New file.
	* ld-gc/pr19161-2.c: Likewise.
	* ld-gc/pr19161.d: Likewise.
This commit is contained in:
H.J. Lu 2015-10-22 12:17:43 -07:00
parent d236ad1955
commit bba037e0ae
7 changed files with 57 additions and 1 deletions
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6
bfd/ChangeLog
View File

@ -1,3 +1,9 @@
2015-10-22 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19161
* elflink.c (elf_gc_sweep): Always keep sections marked with
SEC_KEEP.
2015-10-22 Hans-Peter Nilsson <hp@bitrange.com>
* mmo.c (struct mmo_data_struct): New members

3
bfd/elflink.c
View File

@ -12449,7 +12449,8 @@ elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
o->gc_mark = first->gc_mark;
}
if (o->gc_mark)
/* Always keep sections marked with SEC_KEEP. */
if (o->gc_mark || (o->flags & SEC_KEEP))
continue;
/* Skip sweeping sections already excluded. */

8
ld/testsuite/ChangeLog
View File

@ -1,3 +1,11 @@
2015-10-22 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19161
* ld-gc/gc.exp: Run pr19161 test.
* ld-gc/pr19161-1.c: New file.
* ld-gc/pr19161-2.c: Likewise.
* ld-gc/pr19161.d: Likewise.
2015-10-22 Hans-Peter Nilsson <hp@bitrange.com>
* ld-scripts/script.exp (extract_symbol_test): Allow nm output of

6
ld/testsuite/ld-gc/gc.exp
View File

@ -139,3 +139,9 @@ if { [is_remote host] || [which $CC] != 0 } {
ld_compile "$CC $CFLAGS $cflags" $srcdir/$subdir/pr14265.c tmpdir/pr14265.o
run_dump_test "pr14265"
}
if { [is_remote host] || [which $CC] != 0 } {
ld_compile "$CC $CFLAGS $cflags -O0" $srcdir/$subdir/pr19161-1.c tmpdir/pr19161-1.o
ld_compile "$CC $CFLAGS $cflags -O0" $srcdir/$subdir/pr19161-2.c tmpdir/pr19161-2.o
run_dump_test "pr19161"
}

7
ld/testsuite/ld-gc/pr19161-1.c Normal file
View File

@ -0,0 +1,7 @@
int (*p)(void);
int
main ()
{
return p () != 0x1234;
}

19
ld/testsuite/ld-gc/pr19161-2.c Normal file
View File

@ -0,0 +1,19 @@
int __attribute__((section("my_section"))) a[2] = {0x1234, 0x5678};
extern int __start_my_section;
extern int (*p)(void);
int
dump()
{
int* ap = &__start_my_section;
return ap[0];
}
void
__attribute__((constructor))
foo()
{
p = dump;
}

9
ld/testsuite/ld-gc/pr19161.d Normal file
View File

@ -0,0 +1,9 @@
#name: --gc-sections with __start_SECTIONNAME
#source: dummy.s
#ld: --gc-sections -e main tmpdir/pr19161-1.o tmpdir/pr19161-2.o
#nm: --format=bsd
#xfail: sh64*-*-* iq2000-*-* lm32-*-* epiphany-*-* mips64vr-*-* frv-*-* m32c-*-* rl78-*-* rx-*-* sh-*-* powerpc*-*-eabivle msp430-*-*
#...
0*[1-9a-f]+[0-9a-f]*[ ](D)[ ]_*__start_my_section
#...