[MacPorts] #38298: Boost 1.53 Upgrade Failed: error: "platform not supported"

[MacPorts]

#38298: Boost 1.53 Upgrade Failed: error: "platform not supported"
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  Reporter:  michaelld@…  |      Owner:  adfernandes@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.3
Resolution:               |   Keywords:
      Port:  boost        |
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Comment (by michaelld@…):

 Looks like what happened was a change in how the context module works
 between 1.52 and 1.53. In 1.52, context was provided both via cpp and asm;
 the asm version wasn't used when doing +universal on darwin because the
 "address-model" (being "32_64" [both 32 and 64 bit pointer sizes]) has no
 target associated with it (all of the targets are either 32 or 64) in the
 context's Jamfile.v2; the debug log shows Jam's output about this issue:
 "error: No best alternative for libs/context/build/asm_context_sources",
 and then reverting back to the cpp code.

 In 1.53, there is just asm code, no cpp; hence, if there is no match in
 the Jamfile then nothing can be compiled because there is no backup cpp to
 revert to. The Jam script, as before, provides only 32 or 64 builds, no
 32_64. Further, the toolset was changed from "gcc" to "darwin" between
 1.52 and 1.53, which I think is heading in the correct direction but not
 quite there (though I haven't quite figured out the exact toolset being
 used).

 I see 2 primary choices: (1) disable context, as per an above comment. (2)
 use the muniversal portgroup, compile separately as 32 and 64, then merge
 any binaries; hope that none of the other installed files are 32 or 64
 specific.

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Ticket URL: <https://trac.macports.org/ticket/38298#comment:20>
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