From d452c3b061549008404b81e359c8a8e3f2f043de Mon Sep 17 00:00:00 2001
From: Stefan Reinhold <sre@informatik.uni-kiel.de>
Date: Tue, 17 Jul 2018 10:23:44 +0200
Subject: [PATCH] Make library importable by CMake using find_package

---
 CMakeLists.txt | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b0de85d..8259516 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,6 +5,9 @@ project(GSL CXX)
 include(ExternalProject)
 find_package(Git)
 
+# Use GNUInstallDirs to provide the right locations on all platforms
+include(GNUInstallDirs)
+
 # creates a library GSL which is an interface (header files only)
 add_library(GSL INTERFACE)
 
@@ -55,6 +58,7 @@ target_include_directories(GSL INTERFACE
     $<BUILD_INTERFACE:
         ${CMAKE_CURRENT_SOURCE_DIR}/include
     >
+    $<INSTALL_INTERFACE:include>
 )
 
 if ((CMAKE_VERSION GREATER 3.7.9) OR (CMAKE_VERSION EQUAL 3.7.9))
@@ -72,10 +76,18 @@ if ((CMAKE_VERSION GREATER 3.7.9) OR (CMAKE_VERSION EQUAL 3.7.9))
     endif()
 endif()
 
+install(TARGETS GSL EXPORT GSLConfig
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
 install(
     DIRECTORY include/gsl
-    DESTINATION include
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
+# Make library importable by other projects
+install(EXPORT GSLConfig DESTINATION share/GSL/cmake)
+export(TARGETS GSL FILE GSLConfig.cmake)
 
 option(GSL_TEST "Generate tests." ${GSL_STANDALONE_PROJECT})
 if (GSL_TEST)