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; } $: