[Bug target/91602] GCC fails to build for riscv in a combined tree due to misconfigured leb128 support

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91602

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>Combined tree builds are obsolete and shouldn't be used anymore.)

Huh?  Where is that documented.  In fact the wiki still recommends a combined
build.  Combined builds make building easier.