Fixed version extraction in CMake

cmake/utils.cmake

@@ -2,16 +2,23 @@
 function(spdlog_extract_version)
 	file(READ "${CMAKE_CURRENT_LIST_DIR}/include/spdlog/version.h" file_contents)
 	string(REGEX MATCH "SPDLOG_VER_MAJOR ([0-9]+)" _  "${file_contents}")
+	if(NOT CMAKE_MATCH_COUNT EQUAL 1)
+        message(FATAL_ERROR "Could not extract major version number from spdlog/version.h")
+	endif()
 	set(ver_major ${CMAKE_MATCH_1})
 
 	string(REGEX MATCH "SPDLOG_VER_MINOR ([0-9]+)" _  "${file_contents}")
+	if(NOT CMAKE_MATCH_COUNT EQUAL 1)
+        message(FATAL_ERROR "Could not extract minor version number from spdlog/version.h")
+	endif()
+
 	set(ver_minor ${CMAKE_MATCH_1})
 	string(REGEX MATCH "SPDLOG_VER_PATCH ([0-9]+)" _  "${file_contents}")
+	if(NOT CMAKE_MATCH_COUNT EQUAL 1)
+        message(FATAL_ERROR "Could not extract patch version number from spdlog/version.h")
+	endif()
 	set(ver_patch ${CMAKE_MATCH_1})
 
-	if (NOT ver_major OR NOT ver_minor OR NOT ver_patch)
-		message(FATAL_ERROR "Could not extract valid version from spdlog/version.h")
-	endif()
 	set (SPDLOG_VERSION "${ver_major}.${ver_minor}.${ver_patch}" PARENT_SCOPE)
 endfunction()
 

include/spdlog/version.h

@@ -7,4 +7,5 @@
 #define SPDLOG_VER_MINOR 4
 #define SPDLOG_VER_PATCH 0
 
+
 #define SPDLOG_VERSION (SPDLOG_VER_MAJOR * 10000 + SPDLOG_VER_MINOR * 100 + SPDLOG_VER_PATCH)