From 8782e6c6c422ba64cc8febbf4553e96523abba7e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johel=20Ernesto=20Guerrero=20Pe=C3=B1a?=
 <johelegp@gmail.com>
Date: Sun, 12 Mar 2017 17:16:46 -0400
Subject: [PATCH] Make GSL a CMake consumable header-only library

---
 CMakeLists.txt       | 16 +++++++++++-----
 tests/CMakeLists.txt |  2 +-
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b96546..7f8aff3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,11 +1,17 @@
-cmake_minimum_required(VERSION 2.8.7)
+cmake_minimum_required(VERSION 3.0.0)
 
 project(GSL CXX)
 
-install(
-    DIRECTORY include/gsl
-    DESTINATION include
-)
+add_library(cppgsl INTERFACE)
+target_include_directories(cppgsl INTERFACE
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:include>)
+
+install(TARGETS cppgsl EXPORT cppgslConfig)
+install(DIRECTORY include/gsl DESTINATION include)
+
+export(EXPORT cppgslConfig)
+install(EXPORT cppgslConfig DESTINATION cmake)
 
 enable_testing()
 add_subdirectory(tests)
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 40c46d5..e01e83d 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -34,7 +34,7 @@ endif()
 
 function(add_gsl_test name)
     add_executable(${name} ${name}.cpp)
-    target_link_libraries(${name} UnitTest++)
+    target_link_libraries(${name} UnitTest++ cppgsl)
     add_test(
       ${name}
       ${name}