From b8838d28b356ba4dd72de733be4fe0a611aafb28 Mon Sep 17 00:00:00 2001
From: Markus Blatt <markus@dr-blatt.de>
Date: Fri, 15 Sep 2017 11:21:59 +0200
Subject: [PATCH] Added sibling search mechanism using ${PROJECT_BINARY_DIR}
 for opm-common

If sibling search is activated and opm-common_DIR is not set, then
we try to determine the build directory layout from ${PROJECT_BINARY_DIR}.
The following two possibilities are supported:
 + <modules-build-dir>/<project-name>
 + <project-name>/<build-dir>
where <project-name> is the case sensitive module name (in this case
opm-common).

This results in the following search precedence:
1. User set opm-common_DIR
2. sibling directories search (if the directories exist)
3. Default (system) CMake search path
---
 CMakeLists.txt | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 00c1e7d0..c1d2bebc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,6 +24,24 @@ set( OPM_COMMON_ROOT "" CACHE PATH "Root directory containing OPM related cmake
 option(SIBLING_SEARCH "Search for other modules in sibling directories?" ON)
 
 if(NOT OPM_COMMON_ROOT)
+  if(SIBLING_SEARCH AND NOT opm-common_DIR)
+    # guess the sibling dir
+    get_filename_component(_leaf_dir_name ${PROJECT_BINARY_DIR} NAME)
+    get_filename_component(_parent_full_dir ${PROJECT_BINARY_DIR} DIRECTORY)
+    get_filename_component(_parent_dir_name ${_parent_full_dir} NAME)
+    if(_parent_dir_name STREQUAL CMAKE_PROJECT_NAME)
+      #looks like <module-name>/<build-dir> is used
+      get_filename_component(_modules_dir ${_parent_full_dir} DIRECTORY)
+      if(IS_DIRECTORY ${_modules_dir}/opm-common/${_leaf_dir_name})
+        set(opm-common_DIR ${_modules_dir}/opm-common/${_leaf_dir_name})
+      endif()
+    elseif(_leaf_dir_name STREQUAL CMAKE_PROJECT_NAME)
+      # we assume <build-dir>/<module-name>
+      if(IS_DIRECTORY ${_parent_full_dir}/opm-common)
+        set(opm-common_DIR "${_parent_full_dir}/opm-common}")
+      endif()
+    endif()
+  endif()
    find_package(opm-common QUIET)
 endif()