MantisBT - CMake

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Project

Category

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Date Submitted

Last Update

0015478

CMake

public

2015-03-26 15:25

2015-11-02 09:13

Reporter

Walter Gray

Assigned To

Priority

normal

Severity

minor

Reproducibility

always

Status

closed

Resolution

duplicate

Platform

All

OS Version

Product Version

CMake 3.2.1

Target Version

Fixed in Version

Summary

0015478: As of CMake 3.1 Properties cannot be set to ""

Description

As of CMake 3.0.2, it was completely legal to set a target property to "". This was in fact a very helpful feature for me in some cases since it meant that if I knew I'd set a property to a list (even an empty one), when I read it back later and passed it into a foreach I didn't have to also use an if to check if it existed. This functionality was broken in 3.1, and there is neither a policy setting about it, nor any documentation I can find that indicates this was an intended change.

Steps To Reproduce

Run the following cmake script. In CMake <= 3.0.2, prop1 will be an empty string. In CMake >= 3.1, it will be prop1-NOTFOUND

cmake_minimum_required(VERSION 3.0)
cmake_policy(VERSION 3.0.2)

project(cmaketestproject)

add_executable(testexe test.cpp)

set(emptylist "")

set_target_properties(testexe PROPERTIES INTERFACE_PROP_1 "${emptylist}" INTERFACE_PROP_2 "thing")
get_target_property(prop1 testexe INTERFACE_PROP_1)
get_target_property(prop2 testexe INTERFACE_PROP_2)
get_target_property(prop3 testexe INTERFACE_PROP_3)

message(prop1=${prop1})
message(prop2=${prop2})
message(prop3=${prop3})

Additional Information