[MacPorts] #50983: clang fails with valid OpenMP pragma on py-graph-tool build

[MacPorts]

#50983: clang fails with valid OpenMP pragma on py-graph-tool build
--------------------------+--------------------------------
  Reporter:  s.t.smith@…  |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:  clang-3.9    |
--------------------------+--------------------------------

Comment (by larryv@…):

 [http://llvm.org/releases/3.8.0/tools/clang/docs/ReleaseNotes.html#openmp-
 support-in-clang Clang supports] directive name modifiers in OpenMP 4.5
 `if` clauses. From §2.12 of the [http://www.openmp.org/mp-
 documents/openmp-4.5.pdf OpenMP 4.5 spec]:
 {{{
 #!html
 <blockquote>
 <p>The syntax of the <code>if</code> clause is as follows:</p>
 <div style="border: thin solid; padding: 0.5em;">
 <code>if(</code><span style="font-style: italic;">[directive-name-
 modifier</span><code> :</code><span style="font-style: italic;">]scalar-
 expression</span><code>)</code>
 </div>
 </blockquote>
 }}}

 And from §2.5:
 {{{
 #!html
 <blockquote>
 <p>The syntax of the <code>parallel</code> construct is as follows:</p>
 <div style="border: thin solid; padding: 0.5em;">
 <code>#pragma omp parallel</code> <span style="font-style:
 italic;">[clause[[,]clause]...]new-line</span><br/>
 <span style="font-style: italic; margin-left: 1cm;">structured-
 block</span>
 </div>
 <p>where <em>clause</em> is one of the following:</p>
 <div style="margin-left: 1cm;">
 <code>if(</code><span style="font-style: italic;">[</span><code>parallel
 :</code><span style="font-style: italic;">]scalar-
 expression</span><code>)</code>
 </div>
 …
 </blockquote>
 }}}

 This seems to make “parallel” a sort of reserved word that requires a
 trailing colon, so I doubt LLVM upstream would consider this a bug,
 although you’re free to [https://llvm.org/bugs/ submit a report]. I
 suggest that graph-tool simply use any other variable name.

-- 
Ticket URL: <https://trac.macports.org/ticket/50983#comment:7>
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