Add kconfig to enable -Werror subsystem wide. This is useful for
development and CI to keep the subsystem warning free, while avoiding
issues outside of the subsystem that kernel wide CONFIG_WERROR=y might
hit.
Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
drivers/gpu/drm/Kconfig | 18 ++++++++++++++++++
drivers/gpu/drm/Makefile | 3 +++
2 files changed, 21 insertions(+)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 6ec33d36f3a4..36a00cba2540 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -414,3 +414,21 @@ config DRM_LIB_RANDOM
config DRM_PRIVACY_SCREEN
bool
default n
+
+config DRM_WERROR
+ bool "Compile the drm subsystem with warnings as errors"
+ # 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
+ A kernel build should not cause any compiler warnings, and this
+ enables the '-Werror' flag to enforce that rule in the drm subsystem.
+
+ The drm subsystem enables more warnings than the kernel default, so
+ this config option is disabled by default.
+
+ If in doubt, say N.
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 8b6be830f7c3..b7fd3e58b7af 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -32,6 +32,9 @@ subdir-ccflags-y += -Wno-sign-compare
endif
# --- end copy-paste
+# Enable -Werror in CI and development
+subdir-ccflags-$(CONFIG_DRM_WERROR) += -Werror
+
drm-y := \
drm_aperture.o \
drm_atomic.o \
--
2.39.2
