https://bugs.kde.org/show_bug.cgi?id=401742
Bug ID: 401742
Summary: unreproducible .a files should not be built with LTO
Product: valgrind
Version: 3.14.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: kdebugs...@lsmod.de
Target Milestone: ---
SUMMARY
While working on reproducible builds for openSUSE, I found that
the valgrind package varied for every build
because its .a files contain .o files
created by gcc -flto -c
Such .o files are gcc version specific and not very useful.
Also they always differ from randomness introduced by gcc,
making it impossible to verify that the build was correct.
See also https://bugzilla.opensuse.org/show_bug.cgi?id=1118163
STEPS TO REPRODUCE
1. build openSUSE Factory valgrind package 2 times
2. compare results
OBSERVED RESULT
.a files differ
EXPECTED RESULT
It should be possible to generate identical build results
multiple times.
ADDITIONAL INFORMATION
I got a patch to fix this and will upload it to Phabricator.
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