MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0011375CMakeCMakepublic2010-10-28 05:252016-06-10 14:31
ReporterMatthieu Volat 
Assigned ToBill Hoffman 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionmoved 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0011375: CMake searching of library path on AMD64 architectures with GNU/Linux
DescriptionWhen searching for libraries in pure CXX projects in Linux on 64 bits systems, the lib64 directories are not searched, even with the FIND_LIBRARY_USE_LIB64_PATHS macro set. Adding the 64 prefix works in pure C or hybrid C/CXX projects.
Steps To Reproduce
Additional InformationThe file hierarchy standard (http://www.pathname.com/fhs/pub/fhs-2.3.html#LIB64 [^]) specifies that the "lib" directories will house 32bits binaries on PPC64, s390x, sparc64 and AMD64 architectures running GNU/Linux.

While the FIND_LIBRARY_USE_LIB64_PATHS property allows to mitigate this problem, it still has a few quircks :
* Even setting the property at global level do not seem to apply to subsequent find_package calls
* If a 32bit library with the adequate name is found in "lib" directories, it will be used instead of the native version
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Issue History
Date ModifiedUsernameFieldChange
2010-10-28 05:25Matthieu VolatNew Issue
2010-11-02 07:29Matthieu VolatNote Added: 0022770
2011-01-17 16:53David ColeNote Added: 0024831
2011-01-17 17:00David ColeAssigned To => Bill Hoffman
2011-01-17 17:00David ColeStatusnew => assigned
2011-01-21 10:56Matthieu VolatNote Added: 0024993
2011-01-21 11:03David ColeDescription Updatedbug_revision_view_page.php?rev_id=151#r151
2016-06-10 14:28Kitware RobotNote Added: 0041759
2016-06-10 14:28Kitware RobotStatusassigned => resolved
2016-06-10 14:28Kitware RobotResolutionopen => moved
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0022770)
Matthieu Volat   
2010-11-02 07:29   
Hmm, it seems that my test was a bit hasty:
The problem was observed with a pure C++ project (using the macro PROJECT(myproject CXX) at the begining of the CMakeLists.txt).

Tracking the issue, i went into the cmFindLibraryCommand.cxx file and saw at begining of the cmFindLibraryCommand::AddLib64Paths() function that searching for lib64 variants is only enabled when project is C-enabled.

Transforming it in a C/CXX enabled project is a workaround. I tried enlarging the conditional to allow CXX projects, but it was a mitigated success since some findpackages calls requires a C compiler to build their internal test programs. Maybe this bug should be closed and reopened with a proper description of the problem?
(0024831)
David Cole   
2011-01-17 16:53   
You don't need to close and re-open the bug. As the reporter of a still open bug, you should be able to edit the summary and description fields to reflect reality.

Would you mind re-phrasing this issue to tell us exactly what the problem is and what you think should be done to fix it?

Thanks.
(0024993)
Matthieu Volat   
2011-01-21 10:56   
I'm sorry, I can't find where to edit the description of the bug report. A correct rephrasement of the issue should be :

"When searching for libraries in pure CXX projects in Linux on 64 bits systems, the lib64 directories are not searched, even with the FIND_LIBRARY_USE_LIB64_PATHS macro set. Adding the 64 prefix works in pure C or hybrid C/CXX projects."
(0041759)
Kitware Robot   
2016-06-10 14:28   
Resolving issue as `moved`.

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