add: Allow for temporarily disabling of compiler diagnostics

Workaround for an issue in GCC w.r.t. -Weffc++ on operator= …

src/macros.hpp

@@ -15,6 +15,15 @@
 #define ATTR_LIKELY(x) __builtin_expect((x), 1)
 #define ATTR_UNLIKELY(x) __builtin_expect((x), 0)
 
+#define COMPILER_PRAGMA(x) _Pragma(#x)
+
+#define COMPILER_SUPRESS(flag)                     \
+    COMPILER_PRAGMA(GCC diagnostic push)           \
+    COMPILER_PRAGMA(GCC diagnostic ignored flag)
+
+#define COMPILER_RESTORE(flag) \
+    COMPILER_PRAGMA(GCC diagnostic pop) // flag
+
 #else
 
 #define ATTR_NONNULL_ALL
@@ -30,6 +39,10 @@
 #define ATTR_LIKELY(x) (x)
 #define ATTR_UNLIKELY(x) (x)
 
+#define COMPILER_PRAGMA(x)
+#define COMPILER_SUPRESS(flag)
+#define COMPILER_RESTORE(flag)
+
 #endif
 
 #define MARK_UNUSED(x) (void)(x)