[Bug modula2/116123] flex generated files should be produced in the source tree with --enable-generated-files-in-srcdir so that flex is not needed on build for releases

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116123

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>From maintainer-scripts/gcc_release :
    contrib/gcc_build -d ${SOURCE_DIRECTORY} -o ${OBJECT_DIRECTORY} \
      -c "--enable-generated-files-in-srcdir --disable-multilib" \
      -m "-j$num_cpus" build || \
      error "Could not rebuild GCC"