Mike Stump:
> On Nov 3, 2016, at 1:01 PM, Ximin Luo <infini...@pwned.gg> wrote:
>> Log snippets attached.
> 
> Ick.  You missed the utility of contrib/compare_tests.  :-)
> 
> If you say:
> 
>   contrib/compare_tests oldbuilddir newbuilddir
> 
> You can then sit back and see everything as you'd expect and want.  The 
> output is priority sorted and usually around 0 lines line or so.
> 

Oh, thanks! Here is the output:

~/reproducible/gcc-7-20161030$ contrib/compare_tests ../gcc-build-0/ 
../gcc-build-1/
# Comparing directories
## Dir1=../gcc-build-0/: 8 sum files
## Dir2=../gcc-build-1/: 8 sum files

# Comparing 8 common sum files
## /bin/sh contrib/compare_tests  /tmp/gxx-sum1.9339 /tmp/gxx-sum2.9339
New tests that PASS:

gcc.dg/cpp/source_date_epoch-4.c (test for excess errors)
gcc.dg/cpp/source_date_epoch-4.c execution test
gcc.dg/cpp/source_date_epoch-5.c (test for excess errors)
gcc.dg/cpp/source_date_epoch-5.c execution test
gcc.dg/cpp/source_prefix_map-1.c (test for excess errors)
gcc.dg/cpp/source_prefix_map-1.c execution test
gcc.dg/cpp/source_prefix_map-2.c (test for excess errors)
gcc.dg/cpp/source_prefix_map-2.c execution test
gcc.dg/debug/dwarf2/source_prefix_map-1.c (test for excess errors)
gcc.dg/debug/dwarf2/source_prefix_map-1.c scan-assembler-dem DW_AT_comp_dir: 
"DWARF2TEST/gcc
gcc.dg/debug/dwarf2/source_prefix_map-2.c (test for excess errors)
gcc.dg/debug/dwarf2/source_prefix_map-2.c scan-assembler DW_AT_comp_dir: "/

# No differences found in 8 common sum files


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