makefiles: split gcc -W options

Avoid using gcc only Warnings for compilation of g++ object files.

make.tmpl.in

@@ -142,21 +142,45 @@ INSTALL_SCRIPT = $(INSTALL) -p $(M_INSTALL_PROGRAM)
 
 .SUFFIXES: .c .cpp .d .o .so .a .po .pot .mo .dylib
 
-WFLAGS += -Wall -Wundef -Wshadow -Wcast-align -Wwrite-strings \
- -Wmissing-prototypes -Wmissing-declarations -Wnested-externs \
- -Winline -Wmissing-noreturn -Wformat-security -Wredundant-decls \
- -Wpointer-arith -Wuninitialized -Wmissing-include-dirs \
- -Wfloat-equal -Wstrict-prototypes \
- -Wold-style-definition -Wmissing-format-attribute
+WFLAGS +=\
+ -Wall\
+ -Wcast-align\
+ -Wfloat-equal\
+ -Wformat-security\
+ -Winline\
+ -Wmissing-declarations\
+ -Wmissing-format-attribute\
+ -Wmissing-include-dirs\
+ -Wmissing-noreturn\
+ -Wpointer-arith\
+ -Wredundant-decls\
+ -Wshadow\
+ -Wundef\
+ -Wuninitialized\
+ -Wwrite-strings
+
+WCFLAGS +=\
+ -Wmissing-prototypes\
+ -Wnested-externs\
+ -Wold-style-definition\
+ -Wstrict-prototypes
 
 ifeq ("@HAVE_WJUMP@", "yes")
-WFLAGS += -Wjump-misses-init
+WCFLAGS += -Wjump-misses-init
 endif
 
 ifeq ("@HAVE_WCLOBBERED@", "yes")
-WFLAGS += -Wclobbered -Wempty-body -Wignored-qualifiers \
- -Wmissing-parameter-type -Wold-style-declaration -Woverride-init \
- -Wtype-limits -Wlogical-op
+WFLAGS +=\
+ -Wclobbered\
+ -Wempty-body\
+ -Wignored-qualifiers\
+ -Wlogical-op\
+ -Wtype-limits
+
+WCFLAGS +=\
+ -Wmissing-parameter-type\
+ -Wold-style-declaration\
+ -Woverride-init
 endif
 
 ifeq ("@HAVE_WSYNCNAND@", "yes")
@@ -372,7 +396,7 @@ endif
 $(TARGETS): $(OBJECTS)
 
 %.o: %.c
-	$(CC) -c $(INCLUDES) $(DEFS) $(WFLAGS) $(CFLAGS) $(CFLAGS_$@) $< -o $@
+	$(CC) -c $(INCLUDES) $(DEFS) $(WFLAGS) $(WCFLAGS) $(CFLAGS) $(CFLAGS_$@) $< -o $@
 
 %.o: %.cpp
 	$(CXX) -c $(INCLUDES) $(DEFS) $(WFLAGS) $(CXXFLAGS) $(CXXFLAGS_$@) $< -o $@