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Date Submitted

Last Update

0016017

CMake

public

2016-03-14 10:37

2016-06-10 14:21

Reporter

Abai

Assigned To

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

no change required

Platform

Apple Mac

OSX

OS Version

10.11.3

Product Version

CMake 3.5

Target Version

Fixed in Version

Summary

0016017: Setting OPTION to ON results in FALSE

Description

It seems that setting an arbitrary option to ON results in variable to be set to OFF instead. I am certain that the variable is not cached too. See the example below to reproduce.

Here is the output from the attached CMakeLists.txt:

-- The C compiler identification is AppleClang 7.0.2.7000181
-- The CXX compiler identification is AppleClang 7.0.2.7000181
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- WAX is not defined.
-- Setting WAX=ON.
-- Results in WAX=OFF
-- Configuring done
-- Generating done

The only workaround I found around is (FORCE is required even with empty cache):

SET(WAX ON CACHE BOOL "" FORCE)

Steps To Reproduce

PROJECT(OPTION_BUG)

CMAKE_MINIMUM_REQUIRED(VERSION 3.5.0 FATAL_ERROR)

IF(NOT DEFINED WAX)
MESSAGE(STATUS "WAX is not defined.")
ENDIF()
MESSAGE(STATUS "Setting WAX=ON.")
OPTION(WAX ON)
MESSAGE(STATUS "Results in WAX=${WAX}")

Additional Information

CMake version 3.5.0 installed with home-brew on OSX 10.11.3

Tags

No tags attached.

Attached Files

CMakeLists.txt [^] (231 bytes) 2016-03-14 10:37 [Show Content] [Hide Content]

PROJECT(OPTION_BUG)

CMAKE_MINIMUM_REQUIRED(VERSION 3.5.0 FATAL_ERROR)

IF(NOT DEFINED WAX)
    MESSAGE(STATUS "WAX is not defined.")
ENDIF()
MESSAGE(STATUS "Setting WAX=ON.")
OPTION(WAX ON)
MESSAGE(STATUS "Results in WAX=${WAX}")

Relationships

Notes
(0040672) Brad King (manager) 2016-03-14 10:46	The option() command signature is documented here: https://cmake.org/cmake/help/v3.5/command/option.html [^] The second argument is a documentation string. The third argument is the default value, if any, and the default default is OFF. Therefore the code option(WAX ON) creates an option called "WAX" whose documentation is "ON" and whose default value is "OFF".

(0040677) Abai (reporter) 2016-03-14 10:57	Ah, my bad. Thank you! I guess it's a common misunderstanding as I have seen a few others making the same mistake.

(0041230) Kitware Robot (administrator) 2016-06-10 14:21	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
2016-03-14 10:37	Abai	New Issue
2016-03-14 10:37	Abai	File Added: CMakeLists.txt
2016-03-14 10:46	Brad King	Note Added: 0040672
2016-03-14 10:47	Brad King	Status	new => resolved
2016-03-14 10:47	Brad King	Resolution	open => no change required
2016-03-14 10:57	Abai	Note Added: 0040677
2016-06-10 14:21	Kitware Robot	Note Added: 0041230
2016-06-10 14:21	Kitware Robot	Status	resolved => closed