[cmake-developers] [CMake 0015333]: Behaviour change with 3.1 - target properies set to empty string returned as -NOTFOUND

Mantis Bug Tracker mantis at public.kitware.com
Fri Jan 2 18:39:07 EST 2015


The following issue has been SUBMITTED. 
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http://public.kitware.com/Bug/view.php?id=15333 
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Reported By:                arlbranch
Assigned To:                
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Project:                    CMake
Issue ID:                   15333
Category:                   CMake
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
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Date Submitted:             2015-01-02 18:39 EST
Last Modified:              2015-01-02 18:39 EST
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Summary:                    Behaviour change with 3.1 - target properies set to
empty string returned as -NOTFOUND
Description: 
Under the old behaviour, when a target property was set to "",
get_target_property would give "". In version 3.1 it now gives prop-NOTFOUND.
Needless to say, this change breaks build systems that relied on the old
behaviour.

Steps to Reproduce: 
CMakeLists.txt
---------------
cmake_minimum_required(VERSION 2.8.0)

add_custom_target(tgt)
set_target_properties(tgt PROPERTIES emptyprop "")
get_target_property(val tgt emptyprop)
message("val = ${val}")
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Old Behaviour
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[branch at viter on /dev/pts/9] 1044 ~/tmp/cm31bug/build
$ cmake --version
cmake version 2.8.12.2
[branch at viter on /dev/pts/9] 1045 ~/tmp/cm31bug/build
$ cmake ..
val = 
-- Configuring done
-- Generating done
-- Build files have been written to: /local/home/branch/tmp/cm31bug/build
----------------

New Behaviour
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$ cmake --version
cmake version 3.1.0

CMake suite maintained and supported by Kitware (kitware.com/cmake).
[branch at fortuna on /dev/pts/5] 1054 ~/tmp/cm31bug/fbuild
$ cmake ..
val = val-NOTFOUND
-- Configuring done
-- Generating done
-- Build files have been written to: /home/branch/tmp/cm31bug/fbuild
----------------

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Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2015-01-02 18:39 arlbranch      New Issue                                    
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