From 39bf4de89ff7c87a2205e7ec5483e7424b86a1f6 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 24 Oct 2017 19:15:47 +0100 Subject: [PATCH] drm/i915: Add -Wall -Wextra to our build, set warnings to full MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Recently W=1 on gcc-7.2 (-Wunused-const-variable) caught a regression that had been lurking for 6 months, so lets try enabling the full set of warnings for CI builds. This means more patches will be rejected early that contain trivial and sometimes not so trivial bugs. However, our code does not yet compile cleanly with W=1, so we have to apply a filter to the set of warnings until we can eliminate the mistakes. It also means that developers will have to be running the full gamut of gcc to ensure that as warnings come and go with gcc updates, we have the CI build prepared. v2: Use fine-grained -Wno overrides. Inside the makefile, we can specify CFLAGS on a per-object level, which allows us to limit the scope of any particular warning override. v3: Place per-file overrides after the main enabling block. Signed-off-by: Chris Wilson Cc: Joonas Lahtinen Cc: Jani Nikula Cc: Daniel Vetter Cc: Tomi Sarvela Cc: Michal Wajdeczko Cc: Ville Syrjälä Acked-by: Tomi Sarvela Reviewed-by: Joonas Lahtinen Link: https://patchwork.freedesktop.org/patch/msgid/20171024181547.27889-1-chris@chris-wilson.co.uk Acked-by: Jani Nikula --- drivers/gpu/drm/i915/Makefile | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 6c3b0481ef82..7750be8e27a6 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -2,7 +2,26 @@ # 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 +# Add a set of useful warning flags and enable -Werror for CI to prevent +# trivial mistakes from creeping in. We have to do this piecemeal as we reject +# any patch that isn't warning clean, so turning on -Wall -Wextra (or W=1) we +# need to filter out dubious warnings. Still it is our interest +# to keep running locally with W=1 C=1 until we are completely clean. +# +# Note the danger in using -Wall -Wextra is that when CI updates gcc we +# will most likely get a sudden build breakage... Hopefully we will fix +# new warnings before CI updates! +subdir-ccflags-y := -Wall -Wextra +subdir-ccflags-y += $(call cc-option,-Wno-unused-parameter,) +subdir-ccflags-y += $(call cc-option,-Wno-type-limits,) +subdir-ccflags-y += $(call cc-option,-Wno-missing-field-initializers,) +subdir-ccflags-y += $(call cc-option,-Wno-implicit-fallthrough,) +subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror + +# Fine grained warnings disable +CFLAGS_i915_pci.o = $(call cc-option,-Wno-override-init,) +CFLAGS_intel_fbdev.o = $(call cc-option,-Wno-override-init,) + subdir-ccflags-y += \ $(call as-instr,movntdqa (%eax)$(comma)%xmm0,-DCONFIG_AS_MOVNTDQA) -- 2.30.2