PATCH: compile the kernel with -Werror

From: Muli Ben-Yehuda (
Date: Sat Jul 13 2002 - 02:26:15 EST

A full kernel compilation, especially when using the -j switch to
make, can cause warnings to "fly off the screen" without the user
noticing them. For example, wli's patch lazy_buddy.2.5.25-1 of today
had a missing return statement in a function returning non void, which
the compiler probably complained about but the warning got lost in the
noise (a little birdie told me wli used -j64).

The easiest safeguard agsinst this kind of problems is to compile with
-Werror, so that wherever there's a warning, compilation
stops. Compiling 2.5.25 with -Werror with my .config found only three
warnings (quite impressive, IMHO), and patches for those were sent to

Patch against 2.5.25 to add -Werror attached:

--- linux-2.5.25-vanilla/Makefile Sat Jul 6 02:42:04 2002
+++ linux-2.5.25-mx/Makefile Sat Jul 13 10:01:55 2002
@@ -39,7 +39,7 @@
 FINDHPATH = $(HPATH)/asm $(HPATH)/linux $(HPATH)/scsi $(HPATH)/net
 HOSTCC = gcc
-HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
+HOSTCFLAGS = -Wall -Werror -Wstrict-prototypes -O2 -fomit-frame-pointer
@@ -211,7 +211,7 @@
-CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes -Wno-trigraphs -O2 \
+CFLAGS := $(CPPFLAGS) -Wall -Werror -Wstrict-prototypes -Wno-trigraphs -O2 \
           -fomit-frame-pointer -fno-strict-aliasing -fno-common


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This archive was generated by hypermail 2b29 : Mon Jul 15 2002 - 22:00:25 EST