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Date Submitted

Last Update

0013818

CMake

Modules

public

2012-12-28 15:04

2016-06-10 14:31

Reporter

Reid Kleckner

Assigned To

Kitware Robot

Priority

normal

Severity

minor

Reproducibility

always

Status

closed

Resolution

moved

Platform

Cygwin

Windows

OS Version

Product Version

CMake 2.8.10.2

Target Version

Fixed in Version

Summary

0013818: FindPythonInterp finds a cygwin symlink which can't be used with execute_process

Description

I'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 Reproduce

Install 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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Notes
(0042186) Kitware Robot (administrator) 2016-06-10 14:28	Resolving issue as `moved`. This issue tracker is no longer used. Further discussion of this issue may take place in the current CMake Issues page linked in the banner at the top of this page.

Issue History
Date Modified	Username	Field	Change
2012-12-28 15:04	Reid Kleckner	New Issue
2016-06-10 14:28	Kitware Robot	Note Added: 0042186
2016-06-10 14:28	Kitware Robot	Status	new => resolved
2016-06-10 14:28	Kitware Robot	Resolution	open => moved
2016-06-10 14:28	Kitware Robot	Assigned To	=> Kitware Robot
2016-06-10 14:31	Kitware Robot	Status	resolved => closed