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[Qemu-devel] [PULL v3 08/20] build-system: add clean-coverage target

From: Alex Bennée
Subject: [Qemu-devel] [PULL v3 08/20] build-system: add clean-coverage target
Date: Thu, 5 Jul 2018 17:03:17 +0100

This can be used to remove any stale coverage data before any
particular test run. This is useful for analysing individual tests.

Signed-off-by: Alex Bennée <address@hidden>
Reviewed-by: Daniel P. Berrangé <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Tested-by: Philippe Mathieu-Daudé <address@hidden>---

diff --git a/Makefile b/Makefile
index 39fd4c0546..9731ec1bb7 100644
--- a/Makefile
+++ b/Makefile
@@ -723,6 +723,14 @@ module_block.h: 
$(SRC_PATH)/scripts/modules/module_block.py config-host.mak
        $(addprefix $(SRC_PATH)/,$(patsubst %.mo,%.c,$(block-obj-m))), \
+.PHONY: clean-coverage
+       $(call quiet-command, \
+               find . \( -name '*.gcda' -o -name '*.gcov' \) -type f -exec rm 
{} +, \
+               "CLEAN", "coverage files")
 # avoid old build problems by removing potentially incorrect old files
        rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h 
@@ -1073,6 +1081,9 @@ endif
                echo '')
        @echo  'Cleaning targets:'
        @echo  '  clean           - Remove most generated files but keep the 
+       @echo  '  clean-coverage  - Remove coverage files'
        @echo  '  distclean       - Remove all generated files'
        @echo  '  dist            - Build a distributable tarball'
        @echo  ''
diff --git a/docs/devel/testing.rst b/docs/devel/testing.rst
index 66ef219f69..7f04ca104e 100644
--- a/docs/devel/testing.rst
+++ b/docs/devel/testing.rst
@@ -161,9 +161,14 @@ GCC gcov support
 ``gcov`` is a GCC tool to analyze the testing coverage by
 instrumenting the tested code. To use it, configure QEMU with
 ``--enable-gcov`` option and build. Then run ``make check`` as usual.
-Reports can be obtained by running ``gcov`` command on the output
-files under ``$build_dir/tests/``, please read the ``gcov``
-documentation for more information.
+If you want to gather coverage information on a single test the ``make
+clean-coverage`` target can be used to delete any existing coverage
+information before running a single test.
+Reports can be obtained by running ``gcov`` command
+on the output files under ``$build_dir/tests/``, please read the
+``gcov`` documentation for more information.
 QEMU iotests

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