[Bug 2025142] Re: SRU: build isl with the standard baseline

[Matthias Klose]

the reasoning is not quiet right. There is a test case: Inspection of
the buildlog. Apparently this test case is not accepted by the SRU team.
Closing the issue with the comment "no testcase" is just arrogant.

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Title:
  SRU: build isl with the standard baseline

Status in isl package in Ubuntu:
  Fix Released
Status in isl source package in Jammy:
  Won't Fix
Status in isl source package in Kinetic:
  Won't Fix
Status in isl source package in Lunar:
  Won't Fix

Bug description:
  by default, isl picks up the current processor and optimizes the build
  for that processor. That's not what we want. Configure isl --without-
  gcc-arch instead.

  [ Impact ]

  GCC (linked to libisl) aborts with an illegal instruction on older
  processors.

  Configuring --without-gcc-arch makes isl (and gcc) to work on all
  processors again.

  [ Test plan ]

  Hard to test, because we don't have older processors available. Just
  rely to the build logs, that no explicit -march option is passed in
  the compiler flags.

  [ Where problems could occur ]

  The regression potential is small, isl is only used for the graphite
  optimizations in GCC, which are not used by default.

  isl might become a bit slower when restricted to the standard
  baseline.

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