[Bug bootstrap/62077] --with-build-config=bootstrap-lto fails,

[sven.c.dack at virginmedia dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62077

--- Comment #6 from Sven C. Dack <sven.c.dack at virginmedia dot com> ---
It seems the problem is caused by the use of the jobserver. Changing
bootstrap-lto.mk from:

...
STAGE2_CFLAGS += -flto=jobserver -frandom-seed=1 -ffat-lto-objects
STAGE3_CFLAGS += -flto=jobserver -frandom-seed=1 -ffat-lto-objects
...

to:

...
STAGE2_CFLAGS += -flto=1 -flto-partition=none -frandom-seed=1 -ffat-lto-objects
STAGE3_CFLAGS += -flto=1 -flto-partition=none -frandom-seed=1 -ffat-lto-objects
...

Results in a success without using an additional compare script:

...
Comparing stages 2 and 3
warning: gcc/cc1obj-checksum.o differs
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Comparison successful.
...