[MacPorts] #44581: cmake fails when a deployment target is set but not a matching SDK

[MacPorts]

#44581: cmake fails when a deployment target is set but not a matching SDK
---------------------------------+-------------------------------
  Reporter:  daniele.pontillo@…  |      Owner:  css@…
      Type:  defect              |     Status:  closed
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:  2.3.2
Resolution:  fixed               |   Keywords:  haspatch yosemite
      Port:  cmake               |
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Comment (by akarypid@…):

 Hello,

 I located this bug when investigating a build problem with port that uses
 cmake to build; see: https://trac.macports.org/ticket/47062#comment:8

 I was actually trying to build octave, which failed due to the gl2ps
 library missing, which failed due to CMAKE_OSX_SYSROOT being specified
 when running cmake for the gl2ps package.

 Any idea what the problem is with the the XCode 6.1 command line tools? I
 think that starting with XCode 5 the command line tools are included in
 the XCode application. So you don't need to install the separate command-
 line tools package (just the XCode GUI will do). The command line tools
 are only required if you want to be able to build in a headless
 environment.

 I've installed XCode GUI and been able to build lots of ports without
 issue until now. When I run port I always get a warning:

 {{{
 $ sudo port install octave
 Warning: The Xcode Command Line Tools don't appear to be installed; most
 ports will likely fail to build.
 Warning: Install them by running `xcode-select --install'.
 --->  Computing dependencies for octave
 ...
 }}}

 ...but in fact everything works because the command line tools are present
 on the syste:

 {{{
 $ xcode-select -p
 /Applications/Xcode.app/Contents/Developer
 }}}

 It seems that due to the above, macports note detecting the location of
 the command line tools, it passes a {{{CMAKE_OSX_SYSROOT="/"}}} to cmake
 which causes it to silently break the build...

 Currently I've "cheated" by building and installing gl2ps manually... I
 was able to build octave normally after that.

-- 
Ticket URL: <https://trac.macports.org/ticket/44581#comment:92>
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