Condition coverage, also known as MC/DC (modified condition/decision
coverage) is a coverage metric that tracks separate outcomes in
boolean expressions.
This patch adds CONFIG_CONDITION_COVERAGE option to enable MC/DC for
GCC. Clang is not supported right now.
Signed-off-by: Volodymyr Babchuk <volodymyr_babc...@epam.com>
---
Changes in v2:
- Move gcc version check from .c file to Rules.mk (I can't find
an easy way to check GCC version at Kconfig level)
- Check for gcc 14, not gcc 14.1
---
xen/Kconfig.debug | 9 +++++++++
xen/Rules.mk | 7 +++++++
2 files changed, 16 insertions(+)
diff --git a/xen/Kconfig.debug b/xen/Kconfig.debug
index f7cc5ffaab..7f758d221b 100644
--- a/xen/Kconfig.debug
+++ b/xen/Kconfig.debug
@@ -44,6 +44,15 @@ config COVERAGE
If unsure, say N here.
+config CONDITION_COVERAGE
+ bool "Condition coverage support"
+ depends on COVERAGE && !CC_IS_CLANG
+ help
+ Enable condition coverage support. Used for collecting MC/DC
+ (Modified Condition/Decision Coverage) metrics.
+
+ If unsure, say N here.
+
config DEBUG_LOCK_PROFILE
bool "Lock Profiling"
select DEBUG_LOCKS
diff --git a/xen/Rules.mk b/xen/Rules.mk
index d759cccee3..b6f83caad0 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -138,6 +138,13 @@ 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)
+ ifeq ($(call cc-ifversion,-ge,1400,y),y)
+ COV_FLAGS += -fcondition-coverage
+ else
+ $(error "GCC 14 or newer is required for CONFIG_CONDITION_COVERAGE")
+ endif
+endif
endif
# Reset COV_FLAGS in cases where an objects has another one as prerequisite
--
2.48.1
