https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66007
Bug ID: 66007 Summary: [5 Regression] Narrowing conversion inside { } results in all zero elements in C++11 mode Product: gcc Version: 5.1.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: evangelos at foutrelis dot com Target Milestone: --- Created attachment 35453 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35453&action=edit Different narrowing behavior between GCC 4.9 and GCC 5 This is related to PR c++/65801 which allowed -Wno-narrowing to be used to silence narrowing errors in C++11 mode. Compiling something like "int foo[] = { 1, 0xFFFFFFFF, 3 };" with "-std=c++11 -Wno-error=narrowing" will initialize foo to {0, 0, 0}, whereas GCC 4.9 would initialize it to {1, -1, 3}. (Attached is the assembler code generated by both GCC versions.) (This change in behavior causes at least one crash in Chromium; when using the search box on the settings page, the tab will crash.)