[MacPorts] #66820: boost181 @1.81.0+universal: "combined" is not a known value of feature <architecture> :info:build error: legal values: "x86" ... "arm+x86"

[MacPorts]

#66820: boost181 @1.81.0+universal: "combined" is not a known value of feature
<architecture> :info:build error: legal values: "x86" ... "arm+x86"
-----------------------+-----------------------
  Reporter:  kaamui    |      Owner:  michaelld
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  boost181  |
-----------------------+-----------------------

Comment (by kaamui):

 Using the script of Jesse in [https://stackoverflow.com/a/69924892/4759678
 this thread], I was able to compile boost 1.81.0 as a universal binary.

 It seems to be a configuration issue on boost's side, when using the
 `arm+x86` option.

 boost issue => https://github.com/boostorg/coroutine/issues/60

 Maybe the linkflags option is helping the linker not to fail for
 coroutine_context, and is what's missing when `arm+x86` option is used :
 `./b2 toolset=clang-darwin target-os=darwin architecture=arm abi=aapcs
 cxxflags="-arch arm64" cflags="-arch arm64" linkflags="-arch arm64" -a`

 in the main.log file
 [https://trac.macports.org/attachment/ticket/66820/main.log#L627 L627], we
 can see that patches are applied for `sysv` architecture, where I'm on a
 arm64 (hence `aapcs` architecture). Maybe these patches are applied
 independently of the arch, maybe some equivalent patches are missing for
 `aapcs` architecture.

-- 
Ticket URL: <https://trac.macports.org/ticket/66820#comment:9>
MacPorts <https://www.macports.org/>
Ports system for macOS