[Bug target/65979] [4.9/5/6 Regression] [SH] Wrong code is generated with stage1 compiler

[glaubitz at physik dot fu-berlin.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65979

--- Comment #28 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
> It doesn't bootstrap because the D compiler fails the compare test. This
> happens both on gcc-4.8 and gcc-4.9, here's the excerpt from 4.8 [1]:
> 
> Comparing stages 2 and 3
> warning: gcc/cc1objplus-checksum.o differs
> warning: gcc/cc1-checksum.o differs
> warning: gcc/cc1plus-checksum.o differs
> warning: gcc/cc1obj-checksum.o differs
> Bootstrap comparison failure!
> gcc/d/ctfeexpr.dmd.o differs

Hmm, now I'm confused. The comparision actually also failed before but the
build was still successful [1] for gcc_4.8.4-1:

Comparing stages 2 and 3
warning: gcc/cc1objplus-checksum.o differs
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
Comparison successful.

For gcc_4.8.4-2, the problem is not ignored [2] and the build therefore fails:

Comparing stages 2 and 3
warning: gcc/cc1objplus-checksum.o differs
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
Bootstrap comparison failure!

Interesting. So apparently this is _not_ a regression. Maybe we should split
the comparison failure of stage 2 and stage 3 into a different bug report.

Adrian

> [1] http://buildd.debian-ports.org/status/fetch.php?pkg=gcc-4.8&arch=sh4&ver=4.8.4-1&stamp=1422178262
> [2] http://buildd.debian-ports.org/status/fetch.php?pkg=gcc-4.8&arch=sh4&ver=4.8.4-2&stamp=1432515052