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[PATCH] cmake: Support source include with add_subdirectory and

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find_package use
This commit allows the sources of the project to be included in a parent
project CMakeLists.txt and support use of "find_package(Eigen3 CONFIG REQUIRED)"

Here is an example allowing to test the changes. It is not particularly
useful in itself. This change will allow to support one of the scenario
allowing to create custom 3D Slicer application bundling associated plugins.

/tmp/eigen-git-mirror  # Eigen sources

/tmp/test/CMakeLists.txt:

  cmake_minimum_required(VERSION 3.12)
  project(test)
  add_subdirectory("/tmp/eigen-git-mirror" "eigen-git-mirror")
  find_package(Eigen3 CONFIG REQUIRED)

and configuring it using:

  mkdir /tmp/test-build && cd $_
  cmake \
    -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY:BOOL=1 \
    -DEigen3_DIR:PATH=/tmp/test-build/eigen-git-mirror \
    /tmp/test

Co-authored-by: Pablo Hernandez <pablo.hernandez@kitware.com>
---
 CMakeLists.txt              | 1 +
 cmake/Eigen3Config.cmake.in | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)
This commit is contained in:
Jean-Christophe Fillion-Robin 2018-09-07 15:50:19 -04:00
parent a80a290079
commit 2cbd9dd498
2 changed files with 4 additions and 1 deletions
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1
CMakeLists.txt
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@ -538,6 +538,7 @@ if (NOT CMAKE_VERSION VERSION_LESS 3.0)
# Imported target support
add_library (eigen INTERFACE)
add_library (Eigen3::Eigen ALIAS eigen)
target_compile_definitions (eigen INTERFACE ${EIGEN_DEFINITIONS})
target_include_directories (eigen INTERFACE

4
cmake/Eigen3Config.cmake.in
View File

@ -3,7 +3,9 @@
@PACKAGE_INIT@
include ("${CMAKE_CURRENT_LIST_DIR}/Eigen3Targets.cmake")
if (NOT TARGET eigen)
include ("${CMAKE_CURRENT_LIST_DIR}/Eigen3Targets.cmake")
endif ()
# Legacy variables, do *not* use. May be removed in the future.