fix clang builds

src/CMakeLists.txt

@@ -17,10 +17,12 @@ set_source_files_properties(kernel/version.c PROPERTIES
 COMPILE_DEFINITIONS ERESSEA_VERSION="${ERESSEA_VERSION}")
 ENDIF()
 
-IF(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_CLANG)
+IF (CMAKE_COMPILER_IS_GNUCC)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-error=unused-but-set-variable")
+ENDIF()
+IF (CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
 #    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wconversion -Wno-sign-conversion")
     SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pedantic -Wsign-compare -Wall -Werror -Wno-unknown-pragmas -Wstrict-prototypes -Wpointer-arith -Wno-char-subscripts -Wno-long-long")
-    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-error=unused-but-set-variable")
     SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
     add_definitions(-DHAVE__BOOL)
 ELSEIF(MSVC)

src/kernel/messages.test.c

@@ -75,3 +75,4 @@ CuSuite *get_messages_suite(void) {
     SUITE_ADD_TEST(suite, test_message);
     return suite;
 }
+

src/spells/flyingship.h

@@ -23,3 +23,4 @@ extern "C" {
 #endif
 
 #endif
+

src/util/functions.c

@@ -52,3 +52,4 @@ void register_function(pf_generic fun, const char *name)
 void free_functions(void) {
     cb_clear(&cb_functions);
 }
+