build-sys: add -Wwrite-strings

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Makefile

@@ -23,7 +23,7 @@ ASSUME_MASK ?= 0
 CPPFLAGS = -I libfdt -I . -DFDT_ASSUME_MASK=$(ASSUME_MASK)
 WARNINGS = -Wall -Wpointer-arith -Wcast-qual -Wnested-externs -Wsign-compare \
 	-Wstrict-prototypes -Wmissing-prototypes -Wredundant-decls -Wshadow \
-	-Wsuggest-attribute=format
+	-Wsuggest-attribute=format -Wwrite-strings
 CFLAGS = -g -Os $(SHAREDLIB_CFLAGS) -Werror $(WARNINGS) $(EXTRA_CFLAGS)
 
 BISON = bison

meson.build

@@ -16,6 +16,7 @@ add_project_arguments(
     '-Wredundant-decls',
     '-Wshadow',
     '-Wsuggest-attribute=format',
+    '-Wwrite-strings',
   ]),
   language: 'c'
 )