MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0016002CMakeCMakepublic2016-03-02 09:052016-06-10 14:31
ReporterJordan 
Assigned ToKitware Robot 
PrioritynormalSeverityblockReproducibilityalways
StatusclosedResolutionmoved 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0016002: CMake strips -fPIC from executable compilation which blocks the use of Qt5 and GCC5
DescriptionI understand this case https://cmake.org/Bug/view.php?id=9659. [^]
However, Qt5 and GCC 5 are now forcing fPIC on all compilation.
I have brought this to QT's attention with https://bugreports.qt.io/browse/QTBUG-51593, [^] but they say the policy will not change.
As far as I can tell there is no way to apply fPIC to the executable.
It appears to be stripped from the CMAKE_CXX_FLAGS.
This blocks the use of Qt5 and GCC5.
Steps To ReproduceTake prebuild Qt-5.4.1 or new.
Use GCC-5 or newer.
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Issue History
Date ModifiedUsernameFieldChange
2016-03-02 09:05JordanNew Issue
2016-03-02 09:25Clinton StimpsonNote Added: 0040588
2016-03-02 10:16JordanNote Added: 0040589
2016-06-10 14:29Kitware RobotNote Added: 0042954
2016-06-10 14:29Kitware RobotStatusnew => resolved
2016-06-10 14:29Kitware RobotResolutionopen => moved
2016-06-10 14:29Kitware RobotAssigned To => Kitware Robot
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0040588)
Clinton Stimpson   
2016-03-02 09:25   
This snippet from Qt5CoreConfigExtras.cmake which is part of a Qt5 installation may be relevant.


# Targets using Qt need to use the POSITION_INDEPENDENT_CODE property. The
# Qt5_POSITION_INDEPENDENT_CODE variable is used in the # qt5_use_module
# macro to add it.
set(Qt5_POSITION_INDEPENDENT_CODE True)
set(Qt5Core_EXECUTABLE_COMPILE_FLAGS "-fPIC")
if (CMAKE_VERSION VERSION_LESS 2.8.12
        AND (NOT CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
        OR CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0))
    set_property(TARGET Qt5::Core APPEND PROPERTY INTERFACE_POSITION_INDEPENDENT_CODE "ON")
else()
    set_property(TARGET Qt5::Core APPEND PROPERTY INTERFACE_COMPILE_OPTIONS -fPIC)
endif()
(0040589)
Jordan   
2016-03-02 10:16   
I use SET(CMAKE_POSITION_INDEPENDENT_CODE ON CACHE BOOL "") and I SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Core_EXECUTABLE_COMPILEFLAGS}" CACHE BOOL "" FORCE)
neither works.
(0042954)
Kitware Robot   
2016-06-10 14:29   
Resolving issue as `moved`.

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