Our driver compiles clean (nowadays thanks to 0day) but for me, at least,
it would be beneficial if the compiler threw an error rather than a
warning when it found a piece of suspect code. (I use this to
compile-check patch series and want to break on the first compiler error
in order to fix the patch.)
v2: Kick off a new "Debugging" submenu for i915.ko
At this point, we applied it to the kernel and promptly kicked it out
again as it broke buildbots (due to a compiler warning on 32bits):
commit 908d759b210effb33d927a8cb6603a16448474e4
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Tue May 26 07:46:21 2015 +0200
Revert "drm/i915: Force clean compilation with -Werror"
v3: Avoid enabling -Werror for allyesconfig/allmodconfig builds, using
COMPILE_TEST as a suitable proxy suggested by Andrew Morton. (Damien)
Only make the option available for EXPERT to reinforce that the option
should not be casually enabled.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Damien Lespiau <damien.lespiau@xxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/Kconfig.debug | 17 +++++++++++++++++
drivers/gpu/drm/i915/Makefile | 2 ++
2 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/i915/Kconfig.debug b/drivers/gpu/drm/i915/Kconfig.debug
index 649a562ddf17..61485c8ba3a8 100644
--- a/drivers/gpu/drm/i915/Kconfig.debug
+++ b/drivers/gpu/drm/i915/Kconfig.debug
@@ -1,3 +1,20 @@
+config DRM_I915_WERROR
+ bool "Force GCC to throw an error instead of a warning when compiling"
+ # As this may inadvertently break the build, only allow the user
+ # to shoot oneself in the foot iff they aim really hard
+ depends on EXPERT
+ # We use the dependency on !COMPILE_TEST to not be enabled in
+ # allmodconfig or allyesconfig configurations
+ depends on !COMPILE_TEST
+ default n
+ help
+ Add -Werror to the build flags for (and only for) i915.ko.
+ Do not enable this unless you are writing code for the i915.ko module.
+
+ Recommended for driver developers only.
+
+ If in doubt, say "N".
+
config DRM_I915_DEBUG
bool "Enable additional driver debugging"
depends on DRM_I915
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 7ffb51b0cbc2..0b88ba0f3c1f 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -2,6 +2,8 @@
# Makefile for the drm device driver. This driver provides support for the
# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
+subdir-ccflags-$(CONFIG_DRM_I915_WERROR) := -Werror
+
# Please keep these build lists sorted!
# core driver code
--
2.8.0.rc3
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