This breaks a lot of benchmarks in SPEC CPU 2000.
t.c
int i;
t2.c
int i;
int main() { return i; }
$ ./xgcc -B. -o t t1.c t2.c
$ ./xgcc -B. -o t t1.c t2.c -flto
t2.c:1:5: error: 'i' has already been defined
t1.c:1:5: error: previously defined here
lto-wrapper: ././xgcc returned 1 exit status
collect2: lto-wrapper returned 1 exit status
the LTO behavior is wrong for C. The testcase would violate the C++ ODR, but
LTO should not reject the valid C program (note ODR violations do not need to
be diagnosed).
--
Summary: [LTO] complains about two tentative definitions
Product: gcc
Version: lto
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: lto
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rguenth at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40721
