commit 02f420012a169ed9267a8a78083aaa588e713353
author Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com> Fri Sep 07 15:50:19 2018 -0400
committer Antonio Sánchez <cantonios@google.com> Sun Feb 13 21:22:14 2022 +0000
tree 5803b81af1886e093ff78094b855bc918a92dc63
parent d45ac54008bc2b42d7079abdf63b839dbe3bf2fa

[PATCH] cmake: Support source include with add_subdirectory and
 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(-)


(cherry picked from commit 2cbd9dd49806d686a40841b6d888a83c816efccf)