https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116409
--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to David Binderman from comment #10) > This C code seems to fail with -O1: > > int RB_Open_SingleDocumentation_document; > char RB_Open_SingleDocumentation_document_0, > RB_Open_SingleDocumentation_default_name; > char *RB_Open_SingleDocumentation_name; > void *calloc(); > unsigned long strlen(); > void RB_Open_SingleDocumentation() { > long size = 0; > if (RB_Open_SingleDocumentation_document) > size += strlen(&RB_Open_SingleDocumentation_document_0); > else > size += strlen(&RB_Open_SingleDocumentation_default_name); > RB_Open_SingleDocumentation_name = calloc(size); > } > That is the same testcase as comment #8.