https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77572
Eric Gallager <egallager at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |egallager at gcc dot gnu.org --- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> --- The output I get doesn't have the nonsensical escape sequences: $ /usr/local/bin/g++ -c -S -Wall 77572.cc 77572.cc:1:19: error: invalid conversion from ‘const char*’ to ‘int’ [-fpermissive] constexpr int i = "\x0_\x01_\x7f_\x80_\xff"; ^~~~~~~~~~~~~~~~~~~~~~~~~ 77572.cc:1:19: error: conversion from pointer type ‘const char (*)[10]’ to arithmetic type ‘int’ in a constant expression $ So, FIXED? (You're usually better than me at narrowing down the revision when the fix happened so I'll leave that to you)