From: Prarit Bhargava <prarit@xxxxxxxxxx>
makefile: Add -Werror support for RHEL
The -Werror flag should be enabled for RHEL. In ARK, however, it is a bit
tricky to enable -Werror as a build bug occasionally leaks through
upstream review and into Linus' tree. As a consequence, -Werror cannot be
enabled in ARK but the code to enable it for RHEL can be added to the
top-level makefile.
This code could be placed in the top-level Makefile, around the -Werror
line added by Linus in 3fe617ccafd6 ("Enable '-Werror' by default for all
kernel builds"), but given the amount of RHEL Only code here it is best to
keep it separated in our top-level makefile. Reviewers should note that
there is no harm in calling 'KBUILD_CFLAGS += -Werror' twice and that
-Werror only appears once in gcc calls when compiling kernel files.
Signed-off-by: Prarit Bhargava <prarit@xxxxxxxxxx>
diff --git a/makefile b/makefile
index blahblah..blahblah 100644
--- a/makefile
+++ b/makefile
@@ -14,3 +14,20 @@ dist-%::
distg-%::
$(MAKE) -C redhat $(@) $(_EXTRA_ARGS)
+# Enable -Werror for RHEL
+ifneq ($(DISABLE_WERROR),1)
+ifneq ($(WITH_GCOV),1)
+ifeq ($(KBUILD_EXTMOD),)
+ifneq (,$(filter $(ARCH), x86 x86_64 powerpc s390 aarch64))
+KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
+endif
+# powerpc is compiled with -O3. Starting with gcc 4.8, there have been some
+# known problems with compiler warnings so disable them on all compilers
+# greater than that version
+ifneq (,$(filter $(ARCH), powerpc))
+KBUILD_CFLAGS += $(call cc-ifversion, -gt, 0408, -Wno-uninitialized -Wno-maybe-uninitialized -Wno-error=array-bounds)
+endif
+endif
+endif
+endif
+
--
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2240
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