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IDProjectCategoryView StatusDate SubmittedLast Update
0014983CMakeCMakepublic2014-06-20 07:192016-06-10 14:31
ReporterLudwig Nussel 
Assigned ToKitware Robot 
PrioritynormalSeverityminorReproducibilityhave not tried
StatusclosedResolutionmoved 
PlatformLinuxOSopenSUSEOS VersionFactory
Product VersionCMake 3.0 
Target VersionFixed in Version 
Summary0014983: POSITION_INDEPENDENT_CODE does not add -pie
DescriptionI tried to make wodim a position independent executable to comply with distro policies. I did that by adding this to CMakeLists.txt:
SET_TARGET_PROPERTIES(wodim PROPERTIES POSITION_INDEPENDENT_CODE TRUE)

That however does not set -pie for the linker flags so no actual pie binary is
created. An extra "LINK_FLAGS -pie" is necessary. I guess that's not the
intention of the abstraction.
Steps To ReproduceSET_TARGET_PROPERTIES(wodim PROPERTIES POSITION_INDEPENDENT_CODE TRUE)

should result in

$ readelf -h wodim|grep Type:
  Type: DYN (Shared object file)
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Issue History
Date ModifiedUsernameFieldChange
2014-06-20 07:19Ludwig NusselNew Issue
2014-06-23 10:40Brad KingAssigned To => Stephen Kelly
2014-06-23 10:40Brad KingStatusnew => assigned
2014-06-24 04:55Stephen KellyNote Added: 0036237
2014-06-24 09:39Stephen KellyNote Added: 0036239
2014-06-24 11:32Stephen KellyNote Added: 0036242
2014-06-24 11:32Stephen KellyAssigned ToStephen Kelly =>
2014-06-24 11:32Stephen KellyStatusassigned => backlog
2016-06-10 14:29Kitware RobotNote Added: 0042569
2016-06-10 14:29Kitware RobotStatusbacklog => 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
(0036237)
Stephen Kelly   
2014-06-24 04:55   
http://lfs.osuosl.org/hlfs/view/unstable/glibc/chapter02/pie.html [^]
(0036239)
Stephen Kelly   
2014-06-24 09:39   
This feature was added for the needs of Qt-based executables, as qglobal.h gained a snippet similar to

 #if !defined(__PIC__)
 # error Must compile with -fPIC or -fPIE
 #endif

I followed the lead of qmake, which did not add -pie. I am trying to find out why:

 https://codereview.qt-project.org/88178 [^]
(0036242)
Stephen Kelly   
2014-06-24 11:32   
I don't think I know enough about the issues surrounding this. Changing the behavior of POSITION_INDEPENDENT_CODE affects all users of Qt 4 and 5 imported targets.

The 'safest' way forward is a POSITION_INDEPENDENT_EXECUTABLE property which implies POSITION_INDEPENDENT_CODE.
(0042569)
Kitware Robot   
2016-06-10 14:29   
Resolving issue as `moved`.

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