http://sourceware.org/bugzilla/show_bug.cgi?id=14322
Bug #: 14322
Summary: Linker fails to properly handle __start_SECNAME symbol
Product: binutils
Version: 2.23 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassig...@sourceware.org
ReportedBy: hjl.to...@gmail.com
Classification: Unclassified
[hjl@gnu-6 xxx]$ cat x.c
#include <stdio.h>
extern char *bar ();
extern char __start__data_foo;
int
main ()
{
char *p = bar ();
printf ("%p: %p\n", &__start__data_foo, p);
return 0;
}
[hjl@gnu-6 xxx]$ cat foo.c
#include <stdio.h>
#if 1
int foo __attribute__ ((section ("_data_foo"))) = 0;
extern char __start__data_foo;
#else
char __start__data_foo = 30;
#endif
char *
bar ()
{
char *p = &__start__data_foo;
printf ("%p: %p\n", &__start__data_foo, p);
return p;
}
[hjl@gnu-6 xxx]$ make
gcc -B./ -c -o x.o x.c
gcc -B./ -fPIC -c -o foo.o foo.c
gcc -B./ -shared -o libfoo.so foo.o
gcc -B./ -o x x.o libfoo.so -Wl,-rpath,.
./ld: warning: type and size of dynamic symbol `__start__data_foo' are not
defined
./x
0x7ffff7ffc9e0: 0x7ffff7ffc9e0
(nil): 0x7ffff7ffc9e0
[hjl@gnu-6 xxx]$
GCC should generate ".type __start__data_foo,%object" even if
__start__data_foo is undefined and linker should handle it more
gracefully.
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