dev-util/lcov: Add patch to fix bad error code var

There is a mistake in the lcov code for inconsistent line numbers, the
ignorable error code is an undefined variable. This causes errors like
genhtml: ERROR: "/mnt/host/source/src/platform/ec/common/vboot/vb21_lib.c":18: function 'vb21_is_packed_key
_valid last line is 24 but is 25 in testcase 'vboot'
        (use "genhtml --ignore-errors code_ ..." to bypass this error)

Switch to the correct variable that was fixed in
6f48bf214a (diff-173ac1b8ad02cbcecdc47f8c7fa7762bbcc7050d0efa6a375ffb74eb1517f68cL5342)
but not included in the 2.0 release.

Signed-off-by: Jeremy Bettis <jbettis@google.com>
Closes: https://github.com/gentoo/gentoo/pull/34888
Signed-off-by: Sam James <sam@gentoo.org>

dev-util/lcov/files/lcov-2.0-wrong-error-code.patch

@@ -0,0 +1,18 @@
+From: Jeremy Bettis <jbettis@google.com>
+
+Fix incorrect error code usage.
+
+Bug: https://github.com/linux-test-project/lcov/issues/259
+Signed-off-by: Jeremy Bettis <jbettis@google.com>
+
+--- lcov-2.0/lib/lcovutil.pm
++++ lcov-2.0-fixed/lib/lcovutil.pm
+@@ -4219,7 +4219,7 @@
+                         } else {
+                             if ($f->end_line() != $func->end_line()) {
+                                 lcovutil::ignorable_error(
+-                                       $lcovutil::ERROR_INCONSISTENT,
++                                       $lcovutil::ERROR_INCONSISTENT_DATA,
+                                        '"' . $func->file() .
+                                            '":' . $first . ': function \'' .
+                                            $func->name() . ' last line is ' .

dev-util/lcov/lcov-2.0-r2.ebuild

@@ -0,0 +1,89 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{10..12} )
+inherit optfeature prefix python-any-r1
+
+DESCRIPTION="A graphical front-end for GCC's coverage testing tool gcov"
+HOMEPAGE="https://github.com/linux-test-project/lcov"
+
+if [[ ${PV} == 9999 ]] ; then
+	EGIT_REPO_URI="https://github.com/linux-test-project/lcov.git"
+	inherit git-r3
+else
+	SRC_URI="https://github.com/linux-test-project/lcov/releases/download/v${PV}/${P}.tar.gz"
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x86-linux ~x64-macos"
+fi
+
+LICENSE="GPL-2+"
+SLOT="0"
+IUSE="test"
+RESTRICT="!test? ( test )"
+
+# Python is used for spreadsheet.py
+RDEPEND="
+	dev-lang/perl
+	dev-perl/Capture-Tiny
+	dev-perl/DateTime
+	|| (
+		dev-perl/JSON-XS
+		dev-perl/Cpanel-JSON-XS
+		virtual/perl-JSON-PP
+		dev-perl/JSON
+	)
+	dev-perl/PerlIO-gzip
+"
+BDEPEND="
+	test? (
+		${RDEPEND}
+		dev-perl/GD
+		$(python_gen_any_dep '
+			dev-python/xlsxwriter[${PYTHON_USEDEP}]
+		')
+	)
+"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-wrong-error-code.patch
+)
+
+python_check_deps() {
+	python_has_version "dev-python/xlsxwriter[${PYTHON_USEDEP}]"
+}
+
+pkg_setup() {
+	use test && python-any-r1_pkg_setup
+}
+
+src_prepare() {
+	default
+	if use prefix; then
+		hprefixify bin/*.{pl,sh}
+	fi
+}
+
+src_compile() { :; }
+
+src_test() {
+	emake -j1 check
+}
+
+src_install() {
+	emake -j1 \
+		DESTDIR="${D}" \
+		CFG_DIR="${EPREFIX}/etc" \
+		PREFIX="${EPREFIX}/usr" \
+		LCOV_PERL_PATH="${EPREFIX}/usr/bin/perl" \
+		install
+}
+
+pkg_postinst() {
+	optfeature_header "Optional outuput support:"
+	optfeature "png output support" dev-perl/GD[png]
+	optfeature "spreadsheet output support" dev-python/xlsxwriter
+	optfeature_header "Optional language support:"
+	optfeature "Python code coverage support" dev-python/coverage
+	optfeature "Perl code coverage support" dev-perl/Devel-Cover
+}