[MacPorts] #38271: gsl @1.15_2: AVX should be disabled for variant +optimize

[MacPorts]

#38271: gsl @1.15_2: AVX should be disabled for variant +optimize
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  Reporter:  dtakahashi42@…  |      Owner:  jochen@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.1.3
Resolution:                  |   Keywords:  haspatch
      Port:  gsl             |
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Comment (by dtakahashi42@…):

 The llvm <= 3.2 has a vectorizer bug, which potentially breaks all
 functions that uses datatype based on {{{long long double}}}, e.g.,
 gsl_block_long_double (only AVX capable machines would be affected,
 otherwise the compiler may think the transform is costly, see
 http://llvm.org/bugs/show_bug.cgi?id=15758).

 The fix is included in llvm-3.3 but not backported to the earlier
 versions, and also I had experienced inconsistent result from
 developmental version of llvm-3.3 that caused by, maybe, another bug.

 So, I decided that still it is better to wait for the maturation of llvm,
 and I removed a variant for compiling llvm-3.2 (but it is still possible
 by using the apple's default compiler).

 And could you please remove the default variant from the patch? Hopefully,
 the llvm-3.2 does not vectorize the code by default, and I misunderstand
 the combination effect of variant conflict and default variant. I updated
 the patch.

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Ticket URL: <https://trac.macports.org/ticket/38271#comment:12>
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