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IDProjectCategoryView StatusDate SubmittedLast Update
0011392CMakeCMakepublic2010-11-02 11:482016-06-10 14:31
ReporterDerek Bruening 
Assigned ToKitware Robot 
PlatformOSOS Version
Product VersionCMake-2-8 
Target VersionFixed in Version 
Summary0011392: find_package does not support relative paths
DescriptionI have one CMake project ("drmemory") that uses another ("DynamoRIO") via
find_package, using a cache variable "DynamoRIO_DIR" to point at the
location of the DynamoRIO config file. It is very natural to use a
relative path from the build dir at configure time for DynamoRIO_DIR.
However, this does not always work.

Try this on Linux with any CMake version (I've tried 2.6.4 and 2.8.0) and
you'll get a find_package failure on the config for drmemory:

mkdir test-dotdot
cd test-dotdot
svn checkout -r 474 [^] dynamorio
mkdir -p build-dynamorio/sub
cd build-dynamorio/sub
CXXFLAGS=-m32 CFLAGS=-m32 cmake -DBUILD_DOCS=OFF -DCMAKE_INSTALL_PREFIX=../../exports ../../dynamorio && make -j4 install
cd ../..
svn checkout -r 75 [^] drmemory
mkdir -p build-drmemory/sub
cd build-drmemory/sub
ls ../../exports/cmake
CXXFLAGS=-m32 CFLAGS=-m32 cmake -DDynamoRIO_DIR=../../exports/cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=../../exports_drmemory ../../drmemory

I asked Brad King about this:

  By the time find_package runs it has no clue what the base path was
  for the relative path. The best guess it has is the *source* tree
  containing the CMakeLists.txt that invoked it. This behavior is
  meant for finding in-tree packages.

  We've never supported relative paths here. The command line
  parser has no way to know that DynamoRIO_DIR is a path and not
  a string and therefore cannot do conversion to full path safely.
  Someday we will have a way to map options like --prefix= to cache
  definitions that have types. That mapping might be able to do this.

At the least, the find_package documentation should state that relative
paths are not supported, or what they are relative to. My intuition says
that a relative path would be from the build dir.
TagsNo tags attached.
Attached Files


Kitware Robot (administrator)
2016-06-10 14:28

Resolving issue as `moved`.

This issue tracker is no longer used. Further discussion of this issue may take place in the current CMake Issues page linked in the banner at the top of this page.

 Issue History
Date Modified Username Field Change
2010-11-02 11:48 Derek Bruening New Issue
2010-12-15 12:12 David Cole Assigned To => Brad King
2010-12-15 12:12 David Cole Status new => assigned
2011-09-19 10:21 Brad King Assigned To Brad King =>
2011-09-19 10:21 Brad King Status assigned => backlog
2016-06-10 14:28 Kitware Robot Note Added: 0041760
2016-06-10 14:28 Kitware Robot Status backlog => resolved
2016-06-10 14:28 Kitware Robot Resolution open => moved
2016-06-10 14:28 Kitware Robot Assigned To => Kitware Robot
2016-06-10 14:31 Kitware Robot Status resolved => closed

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