Fix broken library discovery. Merged: a9183756-gh#57

Author: technyon

Arduino/System/BoardBuildTargets.cmake

@@ -861,8 +861,8 @@ function(_library_search_process lib search_paths_var search_suffixes_var return
 			# message("Folder match ${lib}:${dir}:${folder_name_priority}")
 
 			# Check for architecture match
-			file(STRINGS "${dir}/library.properties" arch_str REGEX "architectures=.*")
-			string(REGEX MATCH "architectures=(.*)" arch_list "${arch_str}")
+			file(STRINGS "${dir}/library.properties" arch_str REGEX "^architectures=.*")
+			string(REGEX MATCH "^architectures=(.*)" arch_list "${arch_str}")
 			string(REPLACE "," ";" arch_list "${CMAKE_MATCH_1}")
 			string(TOUPPER "${ARDUINO_BOARD_BUILD_ARCH}" board_arch)
 
@@ -916,11 +916,18 @@ function(_library_search_process lib search_paths_var search_suffixes_var return
 	endif()
 
 	# Although we got the match, let us search for the required header within the folder
-	file(GLOB_RECURSE lib_header_path "${matched_lib_path}/${lib}.h*")
-	if (NOT lib_header_path)
-		set ("${return_var}" "${lib}-NOTFOUND" PARENT_SCOPE)
-		return()
-	endif()
+	file(STRINGS "${matched_lib_path}/library.properties" incl_list REGEX "^includes=.*")
+	string(REGEX MATCH "^includes=(.*)" incl_list "${arch_str}")
+	string(REPLACE "," ";" incl_list "${CMAKE_MATCH_1}")
+
+	foreach(h ${incl_list})
+		file(GLOB_RECURSE lib_header_path "${matched_lib_path}/${h}.h*")
+		if (NOT lib_header_path)
+			message(STATUS "Header ${h} for ${lib} is not found.")
+			set ("${return_var}" "${lib}-NOTFOUND" PARENT_SCOPE)
+			return()
+		endif()
+	endforeach()
 
 	set ("${return_var}" "${matched_lib_path}" PARENT_SCOPE)