| Summary: | when do lto opitimizing with attribute (weak,alias), it will produce wrong code | ||
|---|---|---|---|
| Product: | gcc | Reporter: | huangcunjian <hcj20080469> |
| Component: | middle-end | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | hubicka |
| Priority: | P3 | Keywords: | lto, wrong-code |
| Version: | 4.7.2 | ||
| Target Milestone: | --- | ||
| See Also: | https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32219 | ||
| Host: | Target: | ||
| Build: | Known to work: | 5.1.0 | |
| Known to fail: | 4.7.2, 4.8.0, 4.9.3 | Last reconfirmed: | 2012-09-24 00:00:00 |
| Bug Depends on: | |||
| Bug Blocks: | 92932 | ||
Confirmed. 4.6.x segfaults for me. This was fixed for GCC 5.1.0. The problem is the same as PR 32219 really. (In reply to Andrew Pinski from comment #2) > This was fixed for GCC 5.1.0. The problem is the same as PR 32219 really. That is the patch which fixes PR 32219 fixed this one. |
gcc version is gcc4.7.1 host,build adn target is x86 i586 test case name: weak_0.c extern void abort(void); int foo =0 ; extern int bar __attribute__ ((weak,alias ("foo"))); int main(void) { /* if( &foo != &bar) { abort(); }*/ if ( &foo != &bar) abort(); return 0; } when compilating weaK_0.c with fllowing cmmand : i586-target-linux-gnu-gcc weak_0.c -flto -o weak run week expected result: return 0; actual result: abort();