fix: it is best to define log domain in CFLAGS

Otherwise all source files need to include config.h, which is
cumbersome. Fail to do this and debug logs lose default domain.

CMakeLists.txt

@@ -24,11 +24,11 @@ if(DEFINED CMAKE_C_FLAGS_DEBUG)
 else()
     set(CMAKE_C_FLAGS_DEBUG "-O0 -Wextra")
 endif()
-if(DEFINED CMAKE_C_FLAGS)
-    string(APPEND CMAKE_C_FLAGS " -Wall -Werror")
-else()
-    set(CMAKE_C_FLAGS "-Wall -Werror")
+if(NOT DEFINED CMAKE_C_FLAGS)
+    set(CMAKE_C_FLAGS "")
 endif()
+string(APPEND CMAKE_C_FLAGS
+    " -DG_LOG_DOMAIN=\\\"${PROJECT_NAME}\\\" -Wall -Werror")
 
 set(CMAKE_STATIC_LINKER_FLAGS "-static")
 

src/config.h.in

@@ -1,3 +1,6 @@
+#ifndef _RIFIUTI2_CONFIG_H
+#define _RIFIUTI2_CONFIG_H
+
 #cmakedefine PROJECT_NAME               "@PROJECT_NAME@"
 #cmakedefine PROJECT_VERSION            "@PROJECT_VERSION@"
 #cmakedefine PROJECT_DESCRIPTION        "@PROJECT_DESCRIPTION@"
@@ -6,4 +9,4 @@
 #cmakedefine PROJECT_TOOL_USAGE_URL     "@PROJECT_TOOL_USAGE_URL@"
 #cmakedefine PROJECT_GH_PAGE            "@PROJECT_GH_PAGE@"
 
-#define G_LOG_DOMAIN PROJECT_NAME
+#endif