0f98426a15
According to the GCC docs[1], -flto=auto does: > Use -flto=auto to use GNU make’s job server, if available, or > otherwise fall back to autodetection of the number of CPU threads > present in your system. clang does not support -flto=auto (or -flto=jobserver for that matter), so using this option breaks the build with non-gcc compilers. Pass just -flto instead and rely on gcc doing the right thing. [1] https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html