Fix subproject build (#284)

- export stdlib targets for dependent projects

Author: awvwgk

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.14.0)
 project(stdlib Fortran)
 enable_testing()
 
-include(${CMAKE_SOURCE_DIR}/cmake/stdlib.cmake)
+include(${PROJECT_SOURCE_DIR}/cmake/stdlib.cmake)
 
 # --- compiler options
 if(CMAKE_Fortran_COMPILER_ID STREQUAL GNU)
@@ -52,3 +52,8 @@ if(NOT FYPP)
 endif()
 
 add_subdirectory(src)
+
+install(EXPORT fortran_stdlib-targets
+        NAMESPACE fortran_stdlib::
+        DESTINATION "lib/cmake/fortran_stdlib"
+)

src/CMakeLists.txt

@@ -63,8 +63,9 @@ endif()
 add_subdirectory(tests)
 
 install(TARGETS fortran_stdlib
+        EXPORT fortran_stdlib-targets
         RUNTIME DESTINATION bin
         ARCHIVE DESTINATION lib
         LIBRARY DESTINATION lib
-    )
+)
 install(DIRECTORY ${LIB_MOD_DIR} DESTINATION include)