[MacPorts] #64087: Bug detecting correct arch for 10.13

[MacPorts]

#64087: Bug detecting correct arch for 10.13
---------------------------------------------+--------------------
 Reporter:  gaming-hacker                    |      Owner:  (none)
     Type:  defect                           |     Status:  new
 Priority:  Normal                           |  Milestone:
Component:  base                             |    Version:  2.7.1
 Keywords:  arch, detection, SDK, universal  |       Port:
---------------------------------------------+--------------------
 Hello,

 I am building imagemagick for osx 10.13 and only build for x86_64 so in
 the macports.conf I have specified

 {{{
 build_arch              x86_64
 universal_archs         x86_64 x86_64
 }}}
 in the variants.conf I have specified
 {{{
 -universal
 }}}

 This macports should now build for x86_64 to my understanding. But here is
 part of the log file;


 {{{
 version:1
 :debug:main Starting logging for ImageMagick
 :debug:sysinfo macOS 10.13.6 (darwin/17.7.0) arch i386
 :debug:sysinfo MacPorts 2.7.1
 :debug:sysinfo Xcode 9.3.1
 :debug:sysinfo SDK 10.13
 :debug:sysinfo MACOSX_DEPLOYMENT_TARGET: 10.13
 }}}

 as can be seen somehow macports is picking up i386 initially while later
 on in the build

 {{{
 :info:build libtool: compile:  /usr/bin/clang++ -DHAVE_CONFIG_H -I.
 -I./config
 -I. -I. -I./Magick++/lib -I/opt/local/include -DMAGICKCORE_HDRI_ENABLE=1
 -DMAGICKCORE_QUANTUM_DEPTH=64 -pipe -Os -stdlib=libc++ -arch x86_64
 -pthread
  -MT Magick++/lib/libMagick___7_Q64HDRI_la-Montage.lo -MD -MP -MF
 Magick++/lib/.deps/libMagick___7_Q64HDRI_la-Montage.Tpo
 -c Magick++/lib/Montage.cpp -o Magick++/lib/libMagick___7_Q64HDRI_la-
 Montage.o >/dev/null
 }}}

 It is clearly building x86_64.

 Now the build finally bombs on opencl


 {{{
 :info:build Undefined symbols for architecture x86_64:
 :info:build   "_clBuildProgram", referenced from:
 :info:build       _InitializeOpenCL in libMagickCore_7_Q64HDRI_la-opencl.o
 :info:build   "_clCreateBuffer", referenced from:
 :info:build       _InitializeOpenCL in libMagickCore_7_Q64HDRI_la-opencl.o
 :info:build   "_clCreateCommandQueue", referenced from:
 :info:build       _InitializeOpenCL in libMagickCore_7_Q64HDRI_la-opencl.o
 }}}



 How to disable or otherwise force macports here to accept x86_64 builds
 and no i386 build without updating to 10.14?

 `:debug:sysinfo macOS 10.13.6 (darwin/17.7.0) arch i386`

-- 
Ticket URL: <https://trac.macports.org/ticket/64087>
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