https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62077
--- Comment #14 from Venkataramanan <venkataramanan.kumar at amd dot com> --- (In reply to Sven C. Dack from comment #6) > 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. > ... I tried addding to stage2/3 the flags "-flto=1 -flto-partition=none" instead of jobserver in bootstrap-lto.mk and spawned bootstrap LTO build in one amd64 machine. But still getting compare errors with GCC 4.9 branch. The HEAD is at revision 213070.
