When building a file with -fPIE -pie and -Wl,--no-export-dynamic it still export
dynamic symbols not exported for a "normal" executable.
According to info ld this should normally not happen, but does not specify what
is considered not normal.
As this behavior actually breaks the testsuite for ld if you compile it with
-fPIE -pie my question is if this is a bug that should be fixed or if this is
considered expected.
Example below on how to reporoduce (have reproduced on a Fedora 13-system
running ld 2.20.51.0.2, and on a Gentoo box running 2.20.1), the vers4.c file
can be found in the testsuite as ld/testsuite/ld-elfvers/vers4.c:
$ cat vers4.c
/*
* Testcase to make sure that a versioned symbol definition in an
* application correctly defines the version node, if and only if
* the actual symbol is exported. This is built both with and without
* -export-dynamic.
*/
#include <stdio.h>
extern int foo ();
int
bar()
{
return 3;
}
int
new_foo()
{
return 1000+bar();
}
__asm__(".symver new_foo,foo@@VERS_2.0");
int
main()
{
printf("%d\n", foo());
return 0;
}
$ gcc -o test1 -Wl,--no-export-dynamic vers4.c
$ gcc -o test2 -fPIE -pie -Wl,--no-export-dynamic vers4.c
$ objdump -T test*
test1: file format elf64-x86-64
DYNAMIC SYMBOL TABLE:
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5 printf
0000000000000000 w D *UND* 0000000000000000 __gmon_start__
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5 __libc_start_main
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.4 __stack_chk_fail
test2: file format elf64-x86-64
DYNAMIC SYMBOL TABLE:
0000000000000270 l d .interp 0000000000000000 .interp
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5 printf
0000000000000000 w D *UND* 0000000000000000 __gmon_start__
0000000000000000 w D *UND* 0000000000000000
_Jv_RegisterClasses
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5 __libc_start_main
0000000000000000 w DF *UND* 0000000000000000 GLIBC_2.2.5 __cxa_finalize
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.4 __stack_chk_fail
00000000000008be g DF .text 000000000000003c VERS_2.0 foo
0000000000201020 g D *ABS* 0000000000000000 Base _end
0000000000201010 g D *ABS* 0000000000000000 Base _edata
0000000000000960 g DF .text 0000000000000088 Base __libc_csu_init
0000000000201010 g D *ABS* 0000000000000000 Base __bss_start
0000000000000000 g DO *ABS* 0000000000000000 VERS_2.0 VERS_2.0
00000000000008fa g DF .text 0000000000000054 Base main
0000000000000950 g DF .text 0000000000000002 Base __libc_csu_fini
--
Summary: --no-export-dynamic broken for PIE?
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: xake at rymdraket dot net
CC: bug-binutils at gnu dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=11413
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