with the following test program, gcc-4.0 doesn't emit the required function
canonicalization code (calls to __canonicalize_funcptr_for_compare) to do the
comparison when optimization is enabled.
[EMAIL PROTECTED]:/tmp/dl$ gcc-3.3 -D_GNU_SOURCE -O2 -o default default.c -ldl;
./default; echo $?
0
[EMAIL PROTECTED]:/tmp/dl$ gcc-4.0 -D_GNU_SOURCE -O2 -o default default.c -ldl;
./default; echo $?
1
#include <dlfcn.h>
#include <stdio.h>
int
main (int argc, char *argv[])
{
void *p;
/* Find function `main'. */
p = dlsym (RTLD_DEFAULT, "main");
if (p == NULL)
return -1;
else if ((int (*)(int, char **))p != main)
return 1;
else
return 0;
}
--
Summary: [4.0 regression] Wrong code for function pointer
comparision during optimization
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: tausq at debian dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: hppa-unknown-linux
GCC host triplet: hppa-unknown-linux
GCC target triplet: hppa-unknown-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22051
