Add pragma value to disable GCC warnings altogether

This is useful for generated files such as those produced by the
protocol buffers compiler.

Author: ongardie

GNUmakefile

@@ -73,14 +73,20 @@ NULL := # useful for terminating lists of files
 # The optional third parameter $(3) is any additional options compiler options.
 define run-cc
 @GCCWARN=$$( $(PRAGMAS) -q GCCWARN $(2) ); \
-if [ $$GCCWARN -eq 5 ]; then \
+case $$GCCWARN in \
+0) \
+	echo $(CC) $(CFLAGS_BASE) $(3) -c -o $(1) $(2); \
+	$(CC) $(CFLAGS_BASE) $(3) -c -o $(1) $(2); \
+	;; \
+5) \
 	echo $(CC) $(CFLAGS_NOWERROR) $(3) -c -o $(1) $(2); \
 	$(CC) $(CFLAGS_NOWERROR) $(3) -c -o $(1) $(2); \
-else \
+	;; \
+9) \
 	echo $(CC) $(CFLAGS) $(3) -c -o $(1) $(2); \
 	$(CC) $(CFLAGS) $(3) -c -o $(1) $(2); \
-fi
-
+	;; \
+esac
 endef
 
 # run-cxx:
@@ -91,13 +97,20 @@ endef
 # The optional third parameter $(3) is any additional options compiler options.
 define run-cxx
 @GCCWARN=$$( $(PRAGMAS) -q GCCWARN $(2) ); \
-if [ $$GCCWARN -eq 5 ]; then \
+case $$GCCWARN in \
+0) \
+	echo $(CXX) $(CXXFLAGS_BASE) $(3) -c -o $(1) $(2); \
+	$(CXX) $(CXXFLAGS_BASE) $(3) -c -o $(1) $(2); \
+	;; \
+5) \
 	echo $(CXX) $(CXXFLAGS_NOWERROR) $(3) -c -o $(1) $(2); \
 	$(CXX) $(CXXFLAGS_NOWERROR) $(3) -c -o $(1) $(2); \
-else \
+	;; \
+9) \
 	echo $(CXX) $(CXXFLAGS) $(3) -c -o $(1) $(2); \
 	$(CXX) $(CXXFLAGS) $(3) -c -o $(1) $(2); \
-fi
+	;; \
+esac
 endef
 
 define filter-pragma

pragmas.conf.py

@@ -5,6 +5,7 @@
 magic_pattern = 'RAMCloud[\s_-]+pragma.*\[(.*)\]'
 
 gccwarn = PragmaDefinition('GCC warnings', default=9)
+gccwarn[0] = 'no warnings'
 gccwarn[5] = 'non-fatal warnings'
 gccwarn[9] = 'fatal, pedantic warnings'
 definitions['GCCWARN'] = gccwarn