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Re: [PATCH v3 3/3] xen: debug: gcov: add condition coverage support
- To: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 3 Apr 2025 09:30:21 +0200
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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" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 03 Apr 2025 07:30:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.04.2025 03:17, Volodymyr Babchuk wrote:
> --- a/xen/Kconfig
> +++ b/xen/Kconfig
> @@ -41,6 +41,11 @@ config CC_SPLIT_SECTIONS
> config CC_HAS_UBSAN
> def_bool $(cc-option,-fsanitize=undefined)
>
> +# Compiler supports -fcondition-coverage aka MC/DC
> +config CC_HAS_MCDC
> + def_bool $(cc-option,-fcondition-coverage)
> +
> +
Nit: No double blank lines please.
Also, just to clarify - until the use of Kconfig (alone) for things like
this is properly resolved one way or another, I'm not going to approve
such changes (but I'm also not going to veto them). My proposal [1] is
still pending with no resolution, nor any counter-proposals.
> --- a/xen/Rules.mk
> +++ b/xen/Rules.mk
> @@ -138,6 +138,9 @@ ifeq ($(CONFIG_CC_IS_CLANG),y)
> COV_FLAGS := -fprofile-instr-generate -fcoverage-mapping
> else
> COV_FLAGS := -fprofile-arcs -ftest-coverage
> +ifeq ($(CONFIG_CONDITION_COVERAGE),y)
> + COV_FLAGS += -fcondition-coverage
> +endif
> endif
Personally I find ifeq() uses like this unhelpful, and would prefer
COV_FLAGS-$(CONFIG_CONDITION_COVERAGE) += -fcondition-coverage
together with an eventual
COV_FLAGS += $(COV_FLAGS-y)
(if we don't already have one).
Jan
[1] https://lists.xen.org/archives/html/xen-devel/2022-09/msg01793.html
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