https://sourceware.org/bugzilla/show_bug.cgi?id=22126
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Matthias Klose from comment #0)
> this is a test case from the 'adequate' testsuite trying to construct a
What is the purpose of this test?
> binary with an unresolved symbol. This worked with 2.28, and works in 2.29
Are you sure it works with 2.28? I got
[hjl@gnu-6 pr22126]$ cat x.s
.text
.globl _start
_start:
.dc.a this_symbol_might_be_undefined
[hjl@gnu-6 pr22126]$ make LD=./ld-2.28
as -o x.o x.s
./ld-2.28 --unresolved-symbols=ignore-all -o x x.o
nm x
000000000060007d T __bss_start
000000000060007d T _edata
0000000000600080 T _end
0000000000400078 T _start
[hjl@gnu-6 pr22126]$ ./ld-2.28 -v
GNU ld (GNU Binutils) 2.28.2.20170706
[hjl@gnu-6 pr22126]$
> on non-x86 architectures.
>
> $ cat undef.c
> extern void this_symbol_might_be_undefined(void);
>
> int main(int argc, char **argv)
> {
> this_symbol_might_be_undefined();
> return 0;
> }
>
> $ gcc -no-pie -fno-PIE -Wl,--unresolved-symbols,ignore-all -o my-us1 undef.c
>
> $ nm my-us1 |grep this_symbol
> U this_symbol_might_be_undefined
>
> with ld 2.29, the undefined reference is not emitted, but it is emitted on
> arm, aarch64, powerpc, s390x
With 2.28, I got
[hjl@gnu-6 pr22126]$ cat x.s
.text
.globl _start
_start:
.dc.a this_symbol_might_be_undefined
[hjl@gnu-6 pr22126]$ make
/export/build/gnu/binutils-cross/build-arm-linux-androideabi/gas/as-new -o
x.o x.s
/export/build/gnu/binutils-cross/build-arm-linux-androideabi/ld/ld-new
--unresolved-symbols=ignore-all -o x x.o
/export/build/gnu/binutils-cross/build-arm-linux-androideabi/binutils/nm-new x
00020058 T __bss_end__
00020058 T _bss_end__
00020058 T __bss_start
00020058 T __bss_start__
00020058 T _edata
00020058 T _end
00020058 T __end__
00010054 T _start
[hjl@gnu-6 pr22126]$
The undefined symbol was removed by
ommit d983c8c5503d680c6d4955ceb610a9beebc64460
Author: Alan Modra <amo...@gmail.com>
Date: Wed Feb 18 17:02:39 2015 +1030
Strip undefined symbols from .symtab
bfd/
PR ld/4317
* elflink.c (elf_link_input_bfd): Drop undefined local syms.
(elf_link_output_extsym): Drop local and global undefined syms.
Tidy. Expand comment.
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