Rename and restructure CMake (#1)

# Changes

The `install(EXPORT ...)` commands were failing because they required
Boost to also `install(EXPORT ...)` which Boost doesn't when you
submodule the repository. As such I've made it so that only if you load
the repository as the root repository will it setup the exporting.

As I was resolving this issue, I've also went ahead and renamed the
original targets because it was too generic and also changed the
namespace to be similar to Boost. Yes its not part of the Boost library
but when your `#include` starts with `boost` I think there are some
overlap.

Author: RReichert

CMakeLists.txt

@@ -28,28 +28,28 @@ find_package (Threads)
 find_package(OpenSSL REQUIRED)
 
 
-add_library(core INTERFACE)
+add_library(certify INTERFACE)
 
-add_library(certify::core ALIAS core)
+add_library(Boost::certify ALIAS certify)
 
-target_compile_features(core INTERFACE cxx_std_11)
+target_compile_features(certify INTERFACE cxx_std_11)
 
-target_include_directories(core INTERFACE
+target_include_directories(certify INTERFACE
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
     $<INSTALL_INTERFACE:include>
 )
 
 if(MSVC)
-	target_link_libraries(core INTERFACE Crypt32.lib)
+	target_link_libraries(certify INTERFACE Crypt32.lib)
 endif()
 
 if(APPLE)
-    target_link_libraries(core INTERFACE "-framework CoreFoundation" "-framework Security")
-    set_target_properties(core PROPERTIES LINK_FLAGS "-Wl,-F/Library/Frameworks")
+    target_link_libraries(certify INTERFACE "-framework CoreFoundation" "-framework Security")
+    set_target_properties(certify PROPERTIES LINK_FLAGS "-Wl,-F/Library/Frameworks")
 endif()
 
 target_link_libraries(
-    core
+    certify
     INTERFACE
         Boost::system
         Boost::filesystem
@@ -58,31 +58,33 @@ target_link_libraries(
         OpenSSL::SSL
         OpenSSL::Crypto)
 
-include(CMakePackageConfigHelpers)
-write_basic_package_version_file(
-    "certifyConfigVersion.cmake"
-    COMPATIBILITY AnyNewerVersion)
-
-install(FILES
-            "netutilsConfig.cmake"
-            "${CMAKE_BINARY_DIR}/certifyConfigVersion.cmake"
-        DESTINATION lib/cmake/certify)
-
-install(DIRECTORY ${CMAKE_SOURCE_DIR}/include/
-        DESTINATION include
-        FILES_MATCHING PATTERN "*.hpp")
-
-install(TARGETS core
-        EXPORT certifyTargets
-        INCLUDES DESTINATION include)
-
-install(EXPORT certifyTargets
-        FILE certifyTargets.cmake
-        NAMESPACE certify::
-        DESTINATION lib/cmake/certify)
-
-include(CTest)
-if(BUILD_TESTING)
-    enable_testing()
-    add_subdirectory(tests)
-endif()
+if (PROJECT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+    include(CMakePackageConfigHelpers)
+    write_basic_package_version_file(
+        "certifyConfigVersion.cmake"
+        COMPATIBILITY AnyNewerVersion)
+
+    install(FILES
+                "netutilsConfig.cmake"
+                "${CMAKE_BINARY_DIR}/certifyConfigVersion.cmake"
+            DESTINATION lib/cmake/certify)
+
+    install(DIRECTORY ${CMAKE_SOURCE_DIR}/include/
+            DESTINATION include
+            FILES_MATCHING PATTERN "*.hpp")
+
+    install(TARGETS certify
+            EXPORT certifyTargets
+            INCLUDES DESTINATION include)
+
+    install(EXPORT certifyTargets
+            FILE certifyTargets.cmake
+            NAMESPACE Boost::
+            DESTINATION lib/cmake/certify)
+
+    include(CTest)
+    if(BUILD_TESTING)
+        enable_testing()
+        add_subdirectory(tests)
+    endif()
+endif ()

tests/CMakeLists.txt

@@ -1,7 +1,7 @@
 function (certify_verify_add_test test_file)
     get_filename_component(target_name ${test_file} NAME_WE)
     add_executable(${target_name} ${test_file})
-    target_link_libraries(${target_name} certify::core)
+    target_link_libraries(${target_name} Boost::certify)
     target_include_directories(${target_name} PRIVATE ../include ../tests/extras/include)
     if ( CMAKE_COMPILER_IS_GNUCC )
         target_compile_options(${target_name} PRIVATE -Wall -Wextra -pedantic)