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Re: [PATCH v2] XEN: enable MC/DC coverage for Clang
- To: Saman Dehghan <samaan.dehghan@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 24 Nov 2025 12:11:23 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 24 Nov 2025 11:11:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.11.2025 12:04, Saman Dehghan wrote:
> Clang >= 18 supports Modified Condition/Decision Coverage (MC/DC).
> This patch enables the detection and usage of this feature when
> compiling Xen with Clang.
>
> - Update detection logic in Kconfig to check for the required set of
> Clang flags for MC/DC:
> '-fprofile-instr-generate -fcoverage-mapping -fcoverage-mcdc'.
> This bundle is necessary because '-fcoverage-mcdc' requires
> '-fcoverage-mapping', which in turn requires '-fprofile-instr-generate'.
> - Update llvm.c to handle the profile format changes (bitmap section)
> required for MC/DC.
> - Guard -Wno-error=coverage-too-many-conditions with CONFIG_CC_IS_GCC
> to avoid passing a GCC-only warning option to Clang
>
> Signed-off-by: Saman Dehghan <samaan.dehghan@xxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
ideally with ...
> --- a/xen/Rules.mk
> +++ b/xen/Rules.mk
> @@ -136,6 +136,7 @@ non-init-objects = $(filter-out %.init.o, $(obj-y)
> $(obj-bin-y) $(extra-y))
>
> ifeq ($(CONFIG_CC_IS_CLANG),y)
> cov-cflags-$(CONFIG_COVERAGE) := -fprofile-instr-generate
> -fcoverage-mapping
> + cov-cflags-$(CONFIG_CONDITION_COVERAGE) += -fcoverage-mcdc
... the excess (double) blank here dropped (can likely be done while committing,
if no other need for a v3 arises).
Jan
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