Just to clarify: I'm not whining.
Just asking - should Scribus work with LTO optimisations ( and the error is elshwere - possibly within QtCore) or is the probably cause a fault within Scribus sources.
If anyone is interested, here are my FLAGS:
COMMON_FLAGS="-march=native -pipe -O3 -flto=8 -ffat-lto-objects -fuse-linker-plugin -fuse-ld=gold -fno-delete-null-pointer-checks -fgraphite-identity -floop-nest-optimize"
CFLAGS="${COMMON_FLAGS}"
CXXFLAGS="${COMMON_FLAGS} -fpermissive"
LDFLAGS="-Wl,-O3 -Wl,--sort-common -Wl,-flto=8 -Wl,--as-needed -ffat-lto-objects -fuse-linker-plugin -fuse-ld=gold -fno-delete-null-pointer-checks -fgraphite-identity -floop-nest-optimize"
Out of those, only really relevant here are "flto=8 -ffat-lto-objects"