build: add more warnings

diff --git a/libass/Makefile.am b/libass/Makefile.am
index b134a66d4fbbdcf1e5545a6dbc5aca796e1e665f..524d9a8ed1b87ad7a1b5b36349aee1df53e02d63 100644 (file)
--- a/libass/Makefile.am
+++ b/libass/Makefile.am
@@ -1,4 +1,6 @@
-AM_CFLAGS = -Wall
+AM_CFLAGS = -std=gnu99 -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter \
+            -Werror-implicit-function-declaration -Wstrict-prototypes        \
+            -Wpointer-arith -Wredundant-decls
 
 LIBASS_LT_CURRENT = 5
 LIBASS_LT_REVISION = 0