CI: added msys2-clang Windows build

tests/CMakeLists.txt

@@ -96,7 +96,7 @@ include_directories(googletest/googletest/include)
 
 if (WIN32)
 	set(LIBS ${LIBS} ws2_32 iphlpapi userenv psapi dnsapi dbghelp)
-	if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
+	if ((CMAKE_CXX_COMPILER_ID MATCHES GNU) OR (CMAKE_CXX_COMPILER_ID MATCHES Clang))
 		set(LIBS ${LIBS} bcrypt)
 	endif()
 	add_definitions(-DCURL_STATICLIB)

tests/cmake/flags.cmake

@@ -41,7 +41,12 @@ elseif (CMAKE_CXX_COMPILER_ID MATCHES MSVC)
 	set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${GENERAL_FLAGS} ${WARNING_FLAGS} ${SECURITY_FLAGS} /Ob1 /Ot /Zi /MT")
 
 elseif (CMAKE_CXX_COMPILER_ID MATCHES Clang)
-	set(GENERAL_FLAGS "-pthread")
+	if (WIN32)
+		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")
+	else()
+		set(GENERAL_FLAGS "-pthread")
+	endif()
+
 	set(WARNING_FLAGS "-Wall -Wextra -Wno-undefined-internal")
 	set(OPTIMIZATION_FLAGS "-Ofast -funroll-loops -fmerge-all-constants -flto")