[Bug c/70306] New: wrong code at -O2 and -O3 in 32-bit and 64-bit mode on x86_64-linux-gnu [related to __attribute__((destructor)) and __attribute__((constructor))]
chengniansun at gmail dot com
gcc-bugzilla@gcc.gnu.org
Sat Mar 19 07:16:00 GMT 2016
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70306
Bug ID: 70306
Summary: wrong code at -O2 and -O3 in 32-bit and 64-bit mode on
x86_64-linux-gnu [related to
__attribute__((destructor)) and
__attribute__((constructor))]
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: chengniansun at gmail dot com
Target Milestone: ---
The following code is miscompiled by the trunk at -O2 and -O3 in 32-bit and
64-bit modes on x86_64-linux-gnu.
This bug also affects gcc-5.1.
$: gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 6.0.0 20160318 (experimental) [trunk revision 234347] (GCC)
$:
$: gcc-trunk -O1 small.c ; ./a.out
A
A
B
B
$: gcc-trunk -O2 small.c ; ./a.out
A
B
$: gcc-4.9 -O3 small.c ; ./a.out
A
A
B
B
$:
$: cat small.c
int printf(const char *, ...);
__attribute__((constructor))
void A() { printf("A\n"); }
__attribute__((destructor))
void B() { printf("B\n"); }
__attribute__((constructor))
static void C() { printf("A\n"); }
__attribute__((destructor))
static void D() { printf("B\n"); }
int main() { return 0; }
$:
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