https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65130
Bug ID: 65130
Summary: ICE with LTO on valid code on x86_64-linux-gnu
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
The following code causes an ICE when compiled with the current gcc trunk with
LTO on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It is a regression from 4.9.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 5.0.0 20150219 (experimental) [trunk revision 220822] (GCC)
$
$ gcc-4.9 -flto -O1 -c foo.c
$ gcc-4.9 -flto -O2 -c main.c
$ gcc-4.9 -flto -O1 foo.o main.o
$ ./a.out
$
$ gcc-trunk -flto -O1 -c foo.c
$ gcc-trunk -flto -O2 -c main.c
$ gcc-trunk -flto -O1 foo.o main.o
gcc-trunk: internal compiler error: Segmentation fault (program lto1)
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: fatal error: gcc-trunk returned 4 exit status
compilation terminated.
/usr/bin/ld: lto-wrapper failed
collect2: error: ld returned 1 exit status
$
$ cat foo.c
extern void fn3 (void);
void fn2(void)
{
fn3();
}
void fn1(void)
{
fn2();
}
void fn4(void)
{
fn2();
}
$ cat main.c
extern void fn1(void);
extern void fn4 (void);
int a;
void fn3(void)
{
for (; a;)
fn4();
}
int main() {
fn1();
return 0;
}
$
