https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111577
Bug ID: 111577
Summary: -Os gives significantly bigger code than -O0
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: socketpair at gmail dot com
Target Milestone: ---
Yes, I saw #35806, #41175 and others.
See https://godbolt.org/z/Pnh89Y3Yb
```
#include <string>
using namespace std;
int main(int argc, char* argv[]) {
if (argv[0] == nullptr || argv[1] == nullptr) return 0;
string zxc(argv[0]);
string qwe(argv[1]);
string asd(argv[2]);
zxc = qwe + asd;
return zxc.size();
}
```
-Os -std=c++2b -march=skylake -m64 (615 bytes)
compare size with the smae, but with options:
-O0 -std=c++2b -march=skylake -m64 (409 bytes)
-O0 - is much LESS (!) in bytes. I think it's a bug.
