http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53948
Bug #: 53948
Summary: [4.8 Regression] Assignment line missing for -O0 -g
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Target: x86_64-unknown-linux-gnu
Nothing serious but it broke gdb.base/store.exp and I believe -O0 -g should not
"optimize out" source statements.
int f (register int a, register int b) {
register int x = b, y = a;
return x + y; }
gcc -g
PASS: gcc (GCC) 4.7.2 20120713 (prerelease)
7: 89 f8 mov %edi,%eax
9: 89 f2 mov %esi,%edx
register int x = b, y = a;
b: 41 89 d4 mov %edx,%r12d
e: 89 c3 mov %eax,%ebx
return x + y; }
10: 41 8d 04 1c lea (%r12,%rbx,1),%eax
FAIL: gcc (GCC) 4.8.0 20120713 (experimental)
7: 89 fb mov %edi,%ebx
9: 41 89 f4 mov %esi,%r12d
register int x = b, y = a;
return x + y; }
c: 41 8d 04 1c lea (%r12,%rbx,1),%eax
GDB no longer stops on the 'register int x = b, y = a;' line during 'step'.
.debug_info is correct in both cases.
I can update the GDB testsuite but still I believe 'int var = val;' source line
should have its instruction during -O0 -g, even if it is just a 'nop'.
