[PATCH v3] Makefile: add a prerequisite to the coverage-report target

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Directly invoking make coverage-report as a target results in an error because
its prerequisites are missing,

This patch adds the compile-test prerequisite, which is run only once each time
the compile-report target is invoked. In practice, the developer may decide to
review the coverage-report results without necessarily rerunning for this
coverage-test, if it has already been run.

Signed-off-by: Elia Pinto <gitter.spiros@xxxxxxxxx>
---
This is the third revision of the patch. Compared to the second:

- deleted the Makefile coverage-test.file variable, replaced directly by the
  coverage-test.made file
- added in coverage-compile as last command the touch of coverage-test.made, so
  that even if coverage-test is run first, invoking indirectly it by the first coverage-report does not
  call coverage-test and so the test suite gain.

 Makefile | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index f8bccfab5e..d6ae228c74 100644
--- a/Makefile
+++ b/Makefile
@@ -3407,6 +3407,7 @@ coverage-clean-results:
 	$(RM) coverage-untested-functions
 	$(RM) -r cover_db/
 	$(RM) -r cover_db_html/
+	$(RM) coverage-test.made
 
 coverage-clean: coverage-clean-results
 	$(RM) $(addsuffix *.gcno,$(object_dirs))
@@ -3421,13 +3422,18 @@ coverage-compile:
 coverage-test: coverage-clean-results coverage-compile
 	$(MAKE) CFLAGS="$(COVERAGE_CFLAGS)" LDFLAGS="$(COVERAGE_LDFLAGS)" \
 		DEFAULT_TEST_TARGET=test -j1 test
+	touch coverage-test.made
+
+coverage-test.made:
+	@make coverage-test
+	touch coverage-test.made
 
 coverage-prove: coverage-clean-results coverage-compile
 	$(MAKE) CFLAGS="$(COVERAGE_CFLAGS)" LDFLAGS="$(COVERAGE_LDFLAGS)" \
 		DEFAULT_TEST_TARGET=prove GIT_PROVE_OPTS="$(GIT_PROVE_OPTS) -j1" \
 		-j1 test
 
-coverage-report:
+coverage-report: coverage-test.made
 	$(QUIET_GCOV)for dir in $(object_dirs); do \
 		$(GCOV) $(GCOVFLAGS) --object-directory=$$dir $$dir*.c || exit; \
 	done
-- 
2.35.1




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