https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100373
Bug ID: 100373 Summary: [12 Regression] Darwin, Compare-debug fail after r12-248-gb58dc0b803057 Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap Assignee: unassigned at gcc dot gnu.org Reporter: iains at gcc dot gnu.org Target Milestone: --- Created attachment 50725 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50725&action=edit tarball with asm, objects and obj dumps. Exactly which cases fail seems to depend on the CPU in use and the OS version. For modern CPUs (xeon w, core i5 Skylake) the fail seems to be quite reliably in mpfr (which I build in tree). For older corei7 machines on Darwin16, I've seen also gcc/gcc.o as mismatched. I did a run with -save-temps -dp (asm attached). this is on x86_64-darwin20, but the problem is seen on x86_64-darwin* AFAICT. Backing out r12-248-gb58dc0b803057 allows bootstrap to succeed. attached: stage2-mpfr/src/gmp_op.o.stripped stage2-mpfr/src/gmp_op.o stage2-mpfr/src/gmp_op.s s2.txt == objdump -d -r stage2-mpfr/src/gmp_op.o.stripped >s2.txt stage3-mpfr/src/gmp_op.o.stripped stage3-mpfr/src/gmp_op.o stage3-mpfr/src/gmp_op.s s3.txt == objdump -d -r stage3-mpfr/src/gmp_op.o.stripped >s3.txt