http://sourceware.org/bugzilla/show_bug.cgi?id=12760
Summary: LTO doesn't work with .gnu.warning section
Product: binutils
Version: 2.22 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassig...@sources.redhat.com
ReportedBy: hjl.to...@gmail.com
CC: amo...@gmail.com
[hjl@gnu-mic-1 warn]$ cat foo.c
extern void bar ();
void
foo ()
{
bar ();
}
[hjl@gnu-mic-1 warn]$ cat bar.c
#define linker_warning(x, msg) \
asm(".section .gnu.warning." #x "\n\t.previous"); \
static const char __warn_##x[] \
__attribute__((used, section(".gnu.warning." #x "\n\t#"))) \
= msg
void bar (void) {}
linker_warning(bar, "Bad bar");
[hjl@gnu-mic-1 warn]$ make
/export/build/gnu/gcc-4.6/release/usr/gcc-4.6.1/bin/gcc -O2 -fuse-linker-plugin
-flto=jobserver -c -o foo.o foo.c
/export/build/gnu/gcc-4.6/release/usr/gcc-4.6.1/bin/gcc -O2 -fuse-linker-plugin
-flto=jobserver -c -o bar.o bar.c
ar rv libbar.a bar.o
ar: creating libbar.a
a - bar.o
/export/build/gnu/gcc-4.6/release/usr/gcc-4.6.1/bin/gcc -Wl,-e,foo -nostdlib -o
x1 foo.o -Wl,--start-group libbar.a -Wl,--end-group
foo.o: In function `foo':
foo.c:(.text+0x3): warning: Bad bar
/export/build/gnu/gcc-4.6/release/usr/gcc-4.6.1/bin/gcc -Wl,-e,foo -nostdlib
-O2 -fuse-linker-plugin -flto=jobserver -o x2 foo.o -Wl,--start-group libbar.a
-Wl,--end-group
collect2: ld terminated with signal 11 [Segmentation fault]
make: *** [x2] Error 1
rm bar.o
[hjl@gnu-mic-1 warn]$
Program received signal SIGSEGV, Segmentation fault.
0x000000000045011d in bfd_generic_link_read_symbols (abfd=0x80a588)
at /export/gnu/import/git/binutils-lto/bfd/linker.c:755
755 symsize = bfd_get_symtab_upper_bound (abfd);
Missing separate debuginfos, use: debuginfo-install
glibc-2.13.90-11.1.f14.x86_64 zlib-1.2.5-2.fc14.x86_64
(gdb) bt
#0 0x000000000045011d in bfd_generic_link_read_symbols (abfd=0x80a588)
at /export/gnu/import/git/binutils-lto/bfd/linker.c:755
#1 0x000000000041e058 in warning_callback (info=0x7c5a40,
warning=0x817b40 "Bad bar", symbol=0x7f6c65 "bar", abfd=0x80a588,
section=0x0, address=0)
at /export/gnu/import/git/binutils-lto/ld/ldmain.c:1197
#2 0x0000000000451a43 in _bfd_generic_link_add_one_symbol (info=0x7c5a40,
abfd=0x7fa4c0, name=0x815241 "bar", flags=4096, section=0x816788, value=0,
string=0x817b40 "Bad bar", copy=0, collect=0, hashp=0x0)
at /export/gnu/import/git/binutils-lto/bfd/linker.c:1920
#3 0x000000000048affd in elf_link_add_object_symbols (abfd=0x7fa4c0,
info=0x7c5a40) at /export/gnu/import/git/binutils-lto/bfd/elflink.c:3481
#4 0x000000000048eefa in bfd_elf_link_add_symbols (abfd=0x7fa4c0,
info=0x7c5a40) at /export/gnu/import/git/binutils-lto/bfd/elflink.c:5150
#5 0x0000000000410260 in load_symbols (entry=0x7da0c0, place=0x7fffffffdb70)
at /export/gnu/import/git/binutils-lto/ld/ldlang.c:2822
#6 0x0000000000410e19 in open_input_bfds (s=0x7da0c0, mode=OPEN_BFD_NORMAL)
at /export/gnu/import/git/binutils-lto/ld/ldlang.c:3269
#7 0x0000000000416c2c in lang_process ()
at /export/gnu/import/git/binutils-lto/ld/ldlang.c:6566
#8 0x000000000041c791 in main (argc=25, argv=0x7fffffffddb8)
at /export/gnu/import/git/binutils-lto/ld/ldmain.c:438
(gdb) p *h
$1 = {root = {next = 0x0, string = 0x7f6c65 "bar", hash = 43167049},
type = bfd_link_hash_undefweak, non_ir_ref = 0, u = {undef = {next = 0x0,
abfd = 0x80a588, weak = 0x0}, def = {next = 0x0, section = 0x80a588,
value = 0}, i = {next = 0x0, link = 0x80a588, warning = 0x0}, c = {
next = 0x0, p = 0x80a588, size = 0}}}
(gdb) p h->u.undef.abfd->filename
$2 = 0x34 <Address 0x34 out of bounds>
(gdb) p h->u.def.section->owner->filename
$3 = 0x7fa150 "bar.o (symbol from plugin)"
(gdb)
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