[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]

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

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #6)
> 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"

wait that does not enable m2 ... maybe that is the issue.