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test-manual: document LTO related reproducibility bug

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(From yocto-docs rev: 33b6f7cec780f77ed9cd0518f72ec8c0e3c08e68)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Michael Opdenacker
2021-07-16 19:54:02 +02:00
committed by Richard Purdie
parent 926fae24e1
commit 708aacbb0b
1 changed files with 11 additions and 0 deletions
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documentation/test-manual/reproducible-builds.rst
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@@ -68,6 +68,17 @@ things we do within the build system to ensure reproducibility include:
- Filtering the tools available from the host's ``PATH`` to only a specific set
of tools, set using the :term:`HOSTTOOLS` variable.
.. note::
Because of an open bug in GCC, using ``DISTRO_FEATURES_append = " lto"`` or
adding ``-flto`` (Link Time Optimization) to ``CFLAGS`` makes the resulting
binary non-reproducible, in that it depends on the full absolute build path
to ``recipe-sysroot-native``, so installing the Yocto Project in a different
directory results in a different binary.
This issue is addressed by
:yocto_bugs:`bug 14481 - Programs built with -flto are not reproducible</show_bug.cgi?id=14481>`.
=========================================
Can we prove the project is reproducible?
=========================================