https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120341
--- Comment #4 from Zhendong Su <zhendong.su at inf dot ethz.ch> --- Here is another very similar reproducer that only fails at -Os and seems to go back to at least as early as 10.1. Compiler Explorer: https://godbolt.org/z/7e4jePnY7 [508] % gcctk -v Using built-in specs. COLLECT_GCC=gcctk COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk --enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib Thread model: posix Supported LTO compression algorithms: zlib gcc version 16.0.0 20250521 (experimental) (GCC) [509] % [509] % gcctk -Os small.c; ./a.out [510] % [510] % gcctk -Os -fallow-store-data-races small.c [511] % ./a.out Segmentation fault [512] % [512] % cat small.c char a, *b; int main() { while (a) { b = "0"; b[0]++; } return 0; }
