[MacPorts] #48334: unison @2.48.3_1 build fails on OS X 10.11 beta with "ld: library not found for -lgcc_s.10.5"

[MacPorts]

#48334: unison @2.48.3_1 build fails on OS X 10.11 beta with "ld: library not found
for -lgcc_s.10.5"
-----------------------+--------------------------------
  Reporter:  kenyon@…  |      Owner:  macports-tickets@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.3
Resolution:            |   Keywords:  elcapitan
      Port:  unison    |
-----------------------+--------------------------------
Changes (by ryandesign@…):

 * cc: ryandesign@… (added)


Comment:

 I have seen this before as well, on Yosemite, with Xcode 7 beta. I think
 it is either a bug in Xcode 7 beta, or else a change that I do not
 understand.

 Here's what's in Xcode 6.4:

 {{{
 $ find /Applications/Xcode.app -name 'libgcc_s*'
 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/libgcc_s.1.dylib
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.1.dylib
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.10.4.dylib
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.10.5.dylib
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libgcc_s.1.dylib
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libgcc_s.10.4.dylib
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libgcc_s.10.5.dylib
 }}}

 Here's what's in Xcode 7 beta 3:

 {{{
 $ find /Applications/Xcode-beta.app -name 'libgcc_s*'
 /Applications/Xcode-
 beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/libgcc_s.1.tbd
 /Applications/Xcode-
 beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.1.tbd
 /Applications/Xcode-
 beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.10.4.tbd
 /Applications/Xcode-
 beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/libgcc_s.10.5.tbd
 /Applications/Xcode-
 beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/lib/libgcc_s.1.tbd
 /Applications/Xcode-
 beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/lib/libgcc_s.10.4.tbd
 /Applications/Xcode-
 beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/lib/libgcc_s.10.5.tbd
 }}}

 Whereas Xcode 6.4 (and earlier) provided dynamic libraries for libgcc_s,
 Xcode 7 beta only provides text files with a tbd extension, which is not
 an extension I'm familiar with.

 I'm also not sure where the request to use `-lgcc_s.10.5` in the unison
 build is coming from.

-- 
Ticket URL: <https://trac.macports.org/ticket/48334#comment:2>
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