dnl GNOME_CODE_COVERAGE
dnl
dnl Defines CODE_COVERAGE_CFLAGS and CODE_COVERAGE_LDFLAGS which should be
dnl included in the CFLAGS and LIBS/LDFLAGS variables of every build target
dnl (program or library) which should be built with code coverage support.
dnl Also defines GNOME_CODE_COVERAGE_RULES which should be substituted in your
dnl Makefile; and $enable_code_coverage which can be used in subsequent
dnl configure output.
dnl
dnl Note that all optimisation flags in CFLAGS must be disabled when code
dnl coverage is enabled.
dnl
dnl Derived from Makefile.decl in GLib, originally licenced under LGPLv2.1+.
dnl This file is licenced under LGPLv2.1+.
dnl
dnl Usage example:
dnl configure.ac:
dnl    GNOME_CODE_COVERAGE
dnl
dnl Makefile.am:
dnl    @GNOME_CODE_COVERAGE_RULES@
dnl    my_program_LIBS = … $(CODE_COVERAGE_LDFLAGS) …
dnl    my_program_CFLAGS = … $(CODE_COVERAGE_CFLAGS) …
dnl
dnl This results in a “check-code-coverage” rule being added to any Makefile.am
dnl which includes “@GNOME_CODE_COVERAGE_RULES@” (assuming the module has been
dnl configured with --enable-code-coverage). Running `make check-code-coverage`
dnl in that directory will run the module’s test suite (`make check`) and build
dnl a code coverage report detailing the code which was touched, then print the
dnl URI for the report.

AC_DEFUN([GNOME_CODE_COVERAGE],[
	dnl Check for --enable-code-coverage
	AC_MSG_CHECKING([whether to build with code coverage support])
	AC_ARG_ENABLE([code-coverage], AS_HELP_STRING([--enable-code-coverage], [Whether to enable code coverage support]),, enable_code_coverage=no)
	AM_CONDITIONAL([CODE_COVERAGE_ENABLED], [test x$enable_code_coverage = xyes])
	AC_SUBST([CODE_COVERAGE_ENABLED], [$enable_code_coverage])
	AC_MSG_RESULT($enable_code_coverage)

	AS_IF([ test "$enable_code_coverage" = "yes" ], [
		dnl Check if gcc is being used
		AS_IF([ test "$GCC" = "no" ], [
			AC_MSG_ERROR([not compiling with gcc, which is required for gcov code coverage])
		])

		# List of supported lcov versions.
		lcov_version_list="1.6 1.7 1.8 1.9"

		AC_CHECK_PROG([LCOV], [lcov], [lcov])
		AC_CHECK_PROG([GENHTML], [genhtml], [genhtml])

		AS_IF([ test "$LCOV" ], [
			AC_CACHE_CHECK([for lcov version], gnome_cv_lcov_version, [
				gnome_cv_lcov_version=invalid
				lcov_version=`$LCOV -v 2>/dev/null | $SED -e 's/^.* //'`
				for lcov_check_version in $lcov_version_list; do
					if test "$lcov_version" = "$lcov_check_version"; then
						gnome_cv_lcov_version="$lcov_check_version (ok)"
					fi
				done
			])
		], [
			lcov_msg="To enable code coverage reporting you must have one of the following lcov versions installed: $lcov_version_list"
			AC_MSG_ERROR([$lcov_msg])
		])

		case $gnome_cv_lcov_version in
			""|invalid[)]
				lcov_msg="You must have one of the following versions of lcov: $lcov_version_list (found: $lcov_version)."
				AC_MSG_ERROR([$lcov_msg])
				LCOV="exit 0;"
			;;
		esac

		AS_IF([ test -z "$GENHTML" ], [
			AC_MSG_ERROR([Could not find genhtml from the lcov package])
		])

		dnl Build the code coverage flags
		CODE_COVERAGE_CFLAGS="-O0 -g -fprofile-arcs -ftest-coverage"
		CODE_COVERAGE_LDFLAGS="-lgcov"

		AC_SUBST([CODE_COVERAGE_CFLAGS])
		AC_SUBST([CODE_COVERAGE_LDFLAGS])
	])

GNOME_CODE_COVERAGE_RULES='
# Code coverage
#
# Optional:
#  - CODE_COVERAGE_DIRECTORY: Top-level directory for code coverage reporting.
#    (Default: $(top_builddir))
#  - CODE_COVERAGE_OUTPUT_FILE: Filename and path for the .info file generated
#    by lcov for code coverage. (Default:
#    $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage.info)
#  - CODE_COVERAGE_OUTPUT_DIRECTORY: Directory for generated code coverage
#    reports to be created. (Default:
#    $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage)
#  - CODE_COVERAGE_LCOV_OPTIONS: Extra options to pass to the lcov instance.
#    (Default: empty)
#  - CODE_COVERAGE_GENHTML_OPTIONS: Extra options to pass to the genhtml
#    instance. (Default: empty)
#  - CODE_COVERAGE_IGNORE_PATTERN: Extra glob pattern of files to ignore
#
# The generated report will be titled using the $(PACKAGE_NAME) and
# $(PACKAGE_VERSION). In order to add the current git hash to the title,
# use the git-version-gen script, available online.

# Optional variables
CODE_COVERAGE_DIRECTORY ?= $(top_builddir)
CODE_COVERAGE_OUTPUT_FILE ?= $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage.info
CODE_COVERAGE_OUTPUT_DIRECTORY ?= $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage
CODE_COVERAGE_LCOV_OPTIONS ?=
CODE_COVERAGE_GENHTML_OPTIONS ?=
CODE_COVERAGE_IGNORE_PATTERN ?=

code_coverage_quiet = $(code_coverage_quiet_$(V))
code_coverage_quiet_ = $(code_coverage_quiet_$(AM_DEFAULT_VERBOSITY))
code_coverage_quiet_0 = --quiet

# Use recursive makes in order to ignore errors during check
check-code-coverage:
ifdef CODE_COVERAGE_ENABLED
	-$(MAKE) $(AM_MAKEFLAGS) -k check
	$(MAKE) $(AM_MAKEFLAGS) code-coverage-capture
else
	@echo "Need to reconfigure with --enable-code-coverage"
endif

# Capture code coverage data
code-coverage-capture: code-coverage-capture-hook
ifdef CODE_COVERAGE_ENABLED
	$(LCOV) $(code_coverage_quiet) --directory $(CODE_COVERAGE_DIRECTORY) --capture --output-file "$(CODE_COVERAGE_OUTPUT_FILE).tmp" --test-name "$(PACKAGE_NAME)-$(PACKAGE_VERSION)" --no-checksum --compat-libtool $(CODE_COVERAGE_LCOV_OPTIONS)
	$(LCOV) $(code_coverage_quiet) --directory $(CODE_COVERAGE_DIRECTORY) --remove "$(CODE_COVERAGE_OUTPUT_FILE).tmp" "/tmp/*" $(CODE_COVERAGE_IGNORE_PATTERN) --output-file "$(CODE_COVERAGE_OUTPUT_FILE)"
	-@rm -f $(CODE_COVERAGE_OUTPUT_FILE).tmp
	LANG=C $(GENHTML) $(code_coverage_quiet) --prefix $(CODE_COVERAGE_DIRECTORY) --output-directory "$(CODE_COVERAGE_OUTPUT_DIRECTORY)" --title "$(PACKAGE_NAME)-$(PACKAGE_VERSION) Code Coverage" --legend --show-details "$(CODE_COVERAGE_OUTPUT_FILE)" $(CODE_COVERAGE_GENHTML_OPTIONS)
	@echo "file://$(abs_builddir)/$(CODE_COVERAGE_OUTPUT_DIRECTORY)/index.html"
else
	@echo "Need to reconfigure with --enable-code-coverage"
endif

# Hook rule executed before code-coverage-capture, overridable by the user
code-coverage-capture-hook:

clean: code-coverage-clean
code-coverage-clean:
	-$(LCOV) --directory $(top_builddir) -z
	-rm -rf $(CODE_COVERAGE_OUTPUT_FILE) $(CODE_COVERAGE_OUTPUT_FILE).tmp $(CODE_COVERAGE_OUTPUT_DIRECTORY)
	-find . -name "*.gcda" -o -name "*.gcov" -delete

GITIGNOREFILES ?=
GITIGNOREFILES += $(CODE_COVERAGE_OUTPUT_FILE) $(CODE_COVERAGE_OUTPUT_DIRECTORY)

DISTCHECK_CONFIGURE_FLAGS ?=
DISTCHECK_CONFIGURE_FLAGS += --disable-code-coverage

.PHONY: check-code-coverage code-coverage-capture code-coverage-capture-hook code-coverage-clean
'

	AC_SUBST([GNOME_CODE_COVERAGE_RULES])
	m4_ifdef([_AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE([GNOME_CODE_COVERAGE_RULES])])
])
