build: Add CPM and remove extern

Author: cwahn

CMakeLists.txt

@@ -4,20 +4,23 @@ project(efp_logger VERSION 0.1.0 LANGUAGES C CXX)
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
 
-include(CTest)
-enable_testing()
-
 set(CPACK_PROJECT_NAME ${PROJECT_NAME})
 set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
 include(CPack)
 
+include(cmake/CPM.cmake)
+
+CPMAddPackage("gh:cwahn/efp#v0.1.0-rc.3")
+CPMAddPackage("gh:fmtlib/fmt#10.2.1")
+
 add_library(efp_logger INTERFACE)
 target_include_directories(efp_logger INTERFACE include)
 target_link_libraries(efp_logger INTERFACE efp fmt::fmt)
 
-add_subdirectory(extern)
-
 # Only if the project is the top-most project
 if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+    include(CTest)
+    enable_testing()
+
     add_subdirectory(example)
 endif()