dev-libs/pegtl: conditionally build tests, add USE=examples

With tests and examples off, there's nothing to build at all.

Signed-off-by: Sam James <sam@gentoo.org>

dev-libs/pegtl/pegtl-3.2.8-r1.ebuild

@@ -0,0 +1,31 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake
+
+DESCRIPTION="Header-only library for creating parsers according to Parsing Expression Grammar"
+HOMEPAGE="https://github.com/taocpp/PEGTL"
+SRC_URI="https://github.com/taocpp/PEGTL/archive/${PV}.tar.gz -> ${P}.tar.gz"
+S="${WORKDIR}/${P^^}"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~amd64 ~arm ~arm64 ~riscv ~x86"
+IUSE="examples test"
+RESTRICT="!test? ( test )"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-3.2.1-werror.patch
+)
+
+src_configure() {
+	local mycmakeargs=(
+		-DPEGTL_BUILD_EXAMPLES=$(usex examples)
+		-DPEGTL_BUILD_TESTS=$(usex test)
+		-DPEGTL_INSTALL_CMAKE_DIR="$(get_libdir)/cmake/${PN}"
+		-DPEGTL_INSTALL_DOC_DIR="share/doc/${PF}"
+	)
+	cmake_src_configure
+}