dev-util/gperf: Sync with Gentoo

It's from Gentoo commit c552aae1e4c2dc88ad964fd4134505c2cdf0d26e.

sdk_container/src/third_party/portage-stable/dev-util/gperf/gperf-3.1-r2.ebuild

@@ -0,0 +1,36 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit flag-o-matic
+
+DESCRIPTION="A perfect hash function generator"
+HOMEPAGE="https://www.gnu.org/software/gperf/"
+SRC_URI="mirror://gnu/gperf/${P}.tar.gz"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-strncmp-decl-mismatch.patch
+	"${FILESDIR}"/${P}-clang-16-wregister.patch
+	"${FILESDIR}"/${P}-parallel-tests.patch
+)
+
+src_prepare() {
+	sed -i \
+		-e "/^CPPFLAGS /s:=:+=:" \
+		*/Makefile.in || die #444078
+
+	default
+}
+
+src_configure() {
+	# Aliasing violation (bug #858377)
+	append-flags -fno-strict-aliasing
+	filter-lto
+
+	econf --cache-file="${S}"/config.cache
+}