Make setting of CFLAGS_NOSTRICT make sense
Previously, we would set -fno-strict-aliasing only when
--enable-checking was given to configure but not
--enable-checking=all. The intent seems to have been to
only warn about strict aliasing violations when --enable-checking=all
is in use, but that there was no need to disable the strict-aliasing
diagnostics when -Werror was not enabled.
Unfortunately, -fno-strict-aliasing affects not only the diagnostics
emitted by the compiler, but also the code generation! So we were
leaving the normal (no --enable-checking) case with the compiler
assuming C's strict aliasing rules. The OpenAFS codebase has
historically not been strict-aliasing safe (for example,
commit
15e8678661ec49f5eac3954defad84c06b3e0164 refers to a
runtime crash using a certain compiler version, which is diagnosed
as the compiler using the C strict aliasing rules to make
optimizations that exposed the invalid program code.
To avoid futher surprises due to new compiler optimizations
that utilize the C strict aliasing rules, always disable
strict aliasing except when --enable-checking=all is used.
Change-Id: Ib5d3bbd7c88686bd9a878b6b2c5e7c2b4eeccc04
Reviewed-on: https://gerrit.openafs.org/11988
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>