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IDProjectCategoryView StatusDate SubmittedLast Update
0016020CMakeCMakepublic2016-03-14 22:002016-06-10 14:21
ReporterTom Jakubowski 
Assigned ToRoger Leigh 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionfixed 
PlatformOSOS Version
Product VersionCMake 3.5 
Target VersionCMake 3.5.1Fixed in VersionCMake 3.5.1 
Summary0016020: FindBoost "Automatically add missing component dependencies" fails with header-only libraries
DescriptionIf only some separately-compiled Boost libraries are installed, so that Boost components like Boost.Atomic and Boost.DateTime are used header-only, find_package(Boost REQUIRED COMPONENTS thread) will fail with:

    :1647 (message):
      Unable to find the requested Boost libraries.

      Boost version: 1.56.0

      Boost include path: /opt/foo/deps-64-10/include

      Could not find the following Boost libraries:

              boost_atomic
              boost_chrono
              boost_date_time

If a full installation of Boost 1.56, with all optional separately-compiled libraries, is used instead, then the FindBoost() call succeeds.

This is a regression from CMake 3.4. It seems like https://github.com/Kitware/CMake/commit/01c80acdbdadf3811bc0a6cab0c28469a4e9f5b7 [^] is probably responsible.

Also related to bug 15767.
Steps To Reproduce
Additional Information
TagsNo tags attached.
Relationships
related to 0016013closed Roger Leigh FindBoost: iostreams depends on regex [3.5 regression] 
Attached Files
Issue History
Date ModifiedUsernameFieldChange
2016-03-14 22:00Tom JakubowskiNew Issue
2016-03-15 08:56Brad KingAssigned To => Roger Leigh
2016-03-15 08:56Brad KingStatusnew => assigned
2016-03-15 08:56Brad KingRelationship addedrelated to 0016013
2016-03-15 10:03Brad KingNote Added: 0040692
2016-03-15 10:05Brad KingTarget Version => CMake 3.5.1
2016-03-16 13:13Brad KingNote Added: 0040700
2016-03-16 13:17Brad KingNote Added: 0040702
2016-03-16 13:17Brad KingStatusassigned => resolved
2016-03-16 13:17Brad KingResolutionopen => fixed
2016-03-16 13:17Brad KingFixed in Version => CMake 3.5.1
2016-06-10 14:21Kitware RobotNote Added: 0041225
2016-06-10 14:21Kitware RobotStatusresolved => closed

Notes
(0040692)
Brad King   
2016-03-15 10:03   
Does the change linked in 0016013:0040691 address this?
(0040700)
Brad King   
2016-03-16 13:13   
I've reproduced this error as reported in the description. The change linked in 0016013:0040691 *does* fix it.

In the described environment, however, the FindBoost.Test test case in CMake fails with errors like:

 CMake Error at CMakeLists.txt:7 (add_executable):
   Target "test_boost_tgt" links to target "Boost::chrono" but the target was
   not found. Perhaps a find_package() call is missing for an IMPORTED
   target, or an ALIAS target is missing?

 CMake Error at CMakeLists.txt:7 (add_executable):
   Target "test_boost_tgt" links to target "Boost::date_time" but the target
   was not found. Perhaps a find_package() call is missing for an IMPORTED
   target, or an ALIAS target is missing?

 CMake Error at CMakeLists.txt:7 (add_executable):
   Target "test_boost_tgt" links to target "Boost::atomic" but the target was
   not found. Perhaps a find_package() call is missing for an IMPORTED
   target, or an ALIAS target is missing?

This is because the Boost::thread imported target still records that it depends on the other targets even though they were never created.

This is tricky because when using the Boost::thread imported target we have no way to indicate whether we want the header-only part or to really link to the library. Currently CMake is assuming the latter. Perhaps that is okay because for header-only usage one really only needs the include directory and does not need all the imported targets to get it.
(0040702)
Brad King   
2016-03-16 13:17   
The change linked in 0016013:0040691 has been merged to the 'release' branch for inclusion in CMake 3.5.1. That resolves the issue raised here.

Further discussion raised in 0016020:0040700 would be better held on the mailing list if the status quo is not sufficient.
(0041225)
Kitware Robot   
2016-06-10 14:21   
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