Allow disabling of -Werror

For distro maintainers having `-Werror` can delay update of GCC.
Since every GCC release might add new warnings that were not
yet captured, it might break the build of packages.

With this, distros can now build with `NOWERROR=TRUE` instead of
patching either the errors or the makefiles.

The default behavior keeps on using `-Werror`.

Fixes #798

generate/efi/Makefile.config

@@ -150,7 +150,6 @@ CWARNINGFLAGS = \
 	-Wall\
 	-Wbad-function-cast\
 	-Wdeclaration-after-statement\
-	-Werror\
 	-Wformat=2\
 	-Wmissing-declarations\
 	-Wmissing-prototypes\
@@ -162,6 +161,11 @@ CWARNINGFLAGS = \
 	-Wmissing-parameter-type\
 	-Wold-style-declaration\
 	-Wtype-limits
+
+ifneq ($(NOWERROR),TRUE)
+CWARNINGFLAGS += -Werror
+endif
+
 #
 # Extra warning flags (for possible future use)
 #

generate/unix/Makefile.config

@@ -203,7 +203,6 @@ CWARNINGFLAGS = \
     -Wall\
     -Wbad-function-cast\
     -Wdeclaration-after-statement\
-    -Werror\
     -Wformat=2\
     -Wmissing-declarations\
     -Wmissing-prototypes\
@@ -213,6 +212,10 @@ CWARNINGFLAGS = \
     -Wpointer-arith\
     -Wundef
 
+ifneq ($(NOWERROR),TRUE)
+CWARNINGFLAGS += -Werror
+endif
+
 #
 # Common gcc 4+ warning flags
 #

generate/unix/iasl/Makefile

@@ -290,6 +290,12 @@ CFLAGS += \
     -I$(ASL_COMPILER)\
     -I$(OBJDIR)
 
+ifeq ($(NOWERROR),TRUE)
+WERROR_FLAGS=
+else
+WERROR_FLAGS=-Werror
+endif
+
 #
 # Common Rules
 #
@@ -360,32 +366,32 @@ $(OBJDIR)/prparserparse.c $(OBJDIR)/prparser.y.h :       $(ASL_COMPILER)/prparse
 #
 $(OBJDIR)/aslcompilerlex.o :   $(OBJDIR)/aslcompilerlex.c
 	@echo "- " "Intermediate" $<
-	@$(CC) -c $(CFLAGS) -Wall -Werror -o$@ $<
+	@$(CC) -c $(CFLAGS) -Wall $(WERROR_FLAGS) -o$@ $<
 
 $(OBJDIR)/aslcompilerparse.o : $(OBJDIR)/aslcompilerparse.c
 	@echo "- " "Intermediate" $<
-	@$(CC) -c $(CFLAGS) -Wall -Werror -o$@ $<
+	@$(CC) -c $(CFLAGS) -Wall $(WERROR_FLAGS) -o$@ $<
 
 $(OBJDIR)/dtcompilerparserlex.o :      $(OBJDIR)/dtcompilerparserlex.c
 	@echo "- " "Intermediate" $<
-	@$(CC) -c $(CFLAGS) -Wall -Werror -o$@ $<
+	@$(CC) -c $(CFLAGS) -Wall $(WERROR_FLAGS) -o$@ $<
 
 $(OBJDIR)/dtcompilerparserparse.o :    $(OBJDIR)/dtcompilerparserparse.c
 	@echo "- " "Intermediate" $<
-	@$(CC) -c $(CFLAGS) -Wall -Werror -o$@ $<
+	@$(CC) -c $(CFLAGS) -Wall $(WERROR_FLAGS) -o$@ $<
 
 $(OBJDIR)/dtparserlex.o :      $(OBJDIR)/dtparserlex.c
 	@echo "- " "Intermediate" $<
-	@$(CC) -c $(CFLAGS) -Wall -Werror -o$@ $<
+	@$(CC) -c $(CFLAGS) -Wall $(WERROR_FLAGS) -o$@ $<
 
 $(OBJDIR)/dtparserparse.o :    $(OBJDIR)/dtparserparse.c
 	@echo "- " "Intermediate" $<
-	@$(CC) -c $(CFLAGS) -Wall -Werror -o$@ $<
+	@$(CC) -c $(CFLAGS) -Wall $(WERROR_FLAGS) -o$@ $<
 
 $(OBJDIR)/prparserlex.o :      $(OBJDIR)/prparserlex.c
 	@echo "- " "Intermediate" $<
-	@$(CC) -c $(CFLAGS) -Wall -Werror -o$@ $<
+	@$(CC) -c $(CFLAGS) -Wall $(WERROR_FLAGS) -o$@ $<
 
 $(OBJDIR)/prparserparse.o :    $(OBJDIR)/prparserparse.c
 	@echo "- " "Intermediate" $<
-	@$(CC) -c $(CFLAGS) -Wall -Werror -o$@ $<
+	@$(CC) -c $(CFLAGS) -Wall $(WERROR_FLAGS) -o$@ $<