MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0013818CMakeModulespublic2012-12-28 15:042016-06-10 14:31
ReporterReid Kleckner 
Assigned ToKitware Robot 
PrioritynormalSeverityminorReproducibilityalways
StatusclosedResolutionmoved 
PlatformCygwinOSWindowsOS Version7
Product VersionCMake 2.8.10.2 
Target VersionFixed in Version 
Summary0013818: FindPythonInterp finds a cygwin symlink which can't be used with execute_process
DescriptionI'm using native Windows CMake from a Cygwin shell, so Cygwin Python is on my PATH. My /usr/bin looks like:
$ ll /usr/bin/python*
lrwxrwxrwx 1 rnk Domain Users 13 Aug 20 18:35 /usr/bin/python -> python2.6.exe
-rwxr-xr-x 1 rnk Domain Users 4622 Jun 9 2012 /usr/bin/python2.6.exe
-rwxr-xr-x 1 rnk Domain Users 1419 Jun 9 2012 /usr/bin/python2.6-config
lrwxrwxrwx 1 rnk Domain Users 16 Aug 20 18:35 /usr/bin/python-config -> python2.6-config

FindPythonInterp.cmake uses find_program() with "python" first, which succeeds.

This is a reasonable result to return, but then execute_process fails on the Cygwin symlink file. It doesn't seem reasonable for native Windows CMake to know how to follow Cygwin symlinks, so maybe find_program should fail on such symlinks, or FindPythonInterp should test that it can actually execute the python executable, and fall back to its version based queries.

As a workaround, it's pretty easy for me to point it at the right executable.
Steps To ReproduceInstall or build native Windows CMake
In a Cygwin shell, run cmake on this script:

include(FindPythonInterp)
if( NOT PYTHONINTERP_FOUND )
  message(FATAL_ERROR "can't find python")
endif ()

execute_process(
  COMMAND ${PYTHON_EXECUTABLE} -c "print \"hello\"" RESULT_VARIABLE result)
if (NOT "${result}" STREQUAL "0")
  message(FATAL_ERROR "PYTHON_EXECUTABLE failed, is it a symlink?")
endif ()
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Issue History
Date ModifiedUsernameFieldChange
2012-12-28 15:04Reid KlecknerNew Issue
2016-06-10 14:28Kitware RobotNote Added: 0042186
2016-06-10 14:28Kitware RobotStatusnew => resolved
2016-06-10 14:28Kitware RobotResolutionopen => moved
2016-06-10 14:28Kitware RobotAssigned To => Kitware Robot
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0042186)
Kitware Robot   
2016-06-10 14:28   
Resolving issue as `moved`.

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