build: use CMAKE_INCLUDE_CURRENT_DIR

This uses the CMake mechanism for including the current source and
binary directories.  This avoids the custom handling for this.

CMakeLists.txt

@@ -76,6 +76,8 @@ set(CMAKE_C_EXTENSIONS NO)
 set(CMAKE_C_VISIBILITY_PRESET hidden)
 set(CMAKE_VISIBILITY_INLINES_HIDDEN TRUE)
 
+set(CMAKE_INCLUDE_CURRENT_DIR YES)
+
 # Use CMake's generated headers instead of the Swift package prebuilt ones
 add_compile_definitions(CMARK_USE_CMAKE_HEADERS)
 

extensions/CMakeLists.txt

@@ -17,7 +17,7 @@ include_directories(
   ${PROJECT_BINARY_DIR}/src
 )
 
-include_directories(include ${CMAKE_CURRENT_BINARY_DIR})
+include_directories(include)
 
 if (CMARK_SHARED)
   add_library(${LIBRARY} SHARED ${LIBRARY_SOURCES})

src/CMakeLists.txt

@@ -33,7 +33,7 @@ set(LIBRARY_SOURCES
 
 set(PROGRAM "cmark-gfm")
 
-include_directories(include ${CMAKE_CURRENT_BINARY_DIR})
+include_directories(include)
 include_directories(
   ${PROJECT_SOURCE_DIR}/extensions/include
   ${PROJECT_BINARY_DIR}/extensions
@@ -56,6 +56,7 @@ endif()
 if (CMARK_SHARED)
   add_library(${LIBRARY} SHARED ${LIBRARY_SOURCES})
   target_include_directories(${LIBRARY} PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src/include>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extensions/include>)
     target_link_libraries(${LIBRARY} PRIVATE
@@ -81,6 +82,7 @@ if (CMARK_STATIC)
   target_compile_definitions(${STATICLIBRARY} PUBLIC
     CMARK_GFM_STATIC_DEFINE)
   target_include_directories(${LIBRARY} PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src/include>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extensions/include>)
   target_link_libraries(${STATICLIBRARY} PRIVATE