Makefile.inc: Use 'Wmissing-include-dirs' command option
This is to warn if a user add to Makefile a path to nonexistent
directory.
Change-Id: I5a30c3830f30509deaaadc6eaeab0e17bc08565c
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70251
Reviewed-by: Erik van den Bogaert <ebogaert@eltan.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Makefile.inc b/Makefile.inc
index f1f4646..96121d4 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -423,7 +423,7 @@
CFLAGS_common += -nostdlib -Wall -Wundef -Wstrict-prototypes -Wmissing-prototypes
CFLAGS_common += -Wwrite-strings -Wredundant-decls -Wno-trigraphs -Wimplicit-fallthrough
CFLAGS_common += -Wshadow -Wdate-time -Wtype-limits -Wvla -Wold-style-definition
-CFLAGS_common += -Wdangling-else
+CFLAGS_common += -Wdangling-else -Wmissing-include-dirs
CFLAGS_common += -fno-common -ffreestanding -fno-builtin -fomit-frame-pointer
CFLAGS_common += -fstrict-aliasing -ffunction-sections -fdata-sections -fno-pie
ifeq ($(CONFIG_COMPILER_GCC),y)