try lldb with LTO

llvm-core/lldb/Manifest

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+DIST llvm-project-20.1.4.src.tar.xz 147228104 BLAKE2B 756799d104f94931a6bdca182c4b23983aad9c7ea5acf77f2f5519540137a8dc9a4ec227293c6ba7ddc7fb0fa10cc92e65808f1c07f04bea34a304bb0e2df612 SHA512 acace8175a5468c7e84a89d1564e147e81fe92b6d910f22b058edf72094b27176677c06dbe141fccfbabdad77165f957bbf1ec8aff7bffc85f0757c0103f7e59
+DIST llvm-project-20.1.4.src.tar.xz.sig 566 BLAKE2B 1f0f057dedf938190554ca1a51d9837da9faa38851edb7fe6f305769f3048b5507b010cb81b97550a13c9141e03480009602ff092ddd65b42483b0f79c1523e8 SHA512 634414ea877724ebdeeabe3bb1079d78938aa05dba2243d5458cf211c35444124dc01fa73a593548290196f8c0e40e1e6a4a72571dba4b716b5781c656c6f9b2

llvm-core/lldb/lldb-20.1.4.ebuild

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+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=(python3_{10..13})
+inherit cmake flag-o-matic llvm.org python-single-r1
+
+DESCRIPTION="The LLVM debugger"
+HOMEPAGE="https://llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA"
+SLOT="0/${LLVM_SOABI}"
+KEYWORDS="~amd64 ~arm ~arm64 ~loong ~x86"
+IUSE="debug debuginfod +libedit lzma ncurses +python test +xml"
+RESTRICT="test"
+REQUIRED_USE=${PYTHON_REQUIRED_USE}
+
+DEPEND="
+	debuginfod? (
+		net-misc/curl:=
+		dev-cpp/cpp-httplib:=
+	)
+	libedit? ( dev-libs/libedit:0= )
+	lzma? ( app-arch/xz-utils:= )
+	ncurses? ( >=sys-libs/ncurses-5.9-r3:0= )
+	xml? ( dev-libs/libxml2:= )
+	~llvm-core/clang-${PV}
+	~llvm-core/llvm-${PV}[debuginfod=]
+"
+RDEPEND="
+	${DEPEND}
+	python? (
+		${PYTHON_DEPS}
+	)
+"
+BDEPEND="
+	${PYTHON_DEPS}
+	python? (
+		>=dev-lang/swig-3.0.11
+	)
+	test? (
+		$(python_gen_cond_dep "
+			~dev-python/lit-${PV}[\${PYTHON_USEDEP}]
+			dev-python/psutil[\${PYTHON_USEDEP}]
+		")
+		llvm-core/lld
+	)
+"
+
+LLVM_COMPONENTS=(lldb cmake llvm/utils)
+LLVM_TEST_COMPONENTS=(llvm/lib/Testing/Support third-party)
+llvm.org_set_globals
+
+src_configure() {
+	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
+	use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
+
+	local mycmakeargs=(
+		-DLLVM_ROOT="${ESYSROOT}/usr/lib/llvm/${LLVM_MAJOR}"
+		-DClang_ROOT="${ESYSROOT}/usr/lib/llvm/${LLVM_MAJOR}"
+
+		-DLLDB_ENABLE_CURSES=$(usex ncurses)
+		-DLLDB_ENABLE_LIBEDIT=$(usex libedit)
+		-DLLDB_ENABLE_PYTHON=$(usex python)
+		-DLLDB_ENABLE_LUA=OFF
+		-DLLDB_ENABLE_LZMA=$(usex lzma)
+		-DLLDB_ENABLE_LIBXML2=$(usex xml)
+		-DLLVM_ENABLE_TERMINFO=$(usex ncurses)
+
+		-DLLDB_INCLUDE_TESTS=$(usex test)
+
+		-DCLANG_LINK_CLANG_DYLIB=ON
+		# TODO: fix upstream to detect this properly
+		-DHAVE_LIBDL=ON
+		-DHAVE_LIBPTHREAD=ON
+
+		# normally we'd have to set LLVM_ENABLE_TERMINFO, HAVE_TERMINFO
+		# and TERMINFO_LIBS... so just force FindCurses.cmake to use
+		# ncurses with complete library set (including autodetection
+		# of -ltinfo)
+		-DCURSES_NEED_NCURSES=ON
+
+		-DCLANG_RESOURCE_DIR="../../../clang/${LLVM_MAJOR}"
+
+		-DLLVM_MAIN_SRC_DIR="${WORKDIR}/llvm"
+		-DPython3_EXECUTABLE="${PYTHON}"
+	)
+	use test && mycmakeargs+=(
+		-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+		-DLLVM_LIT_ARGS="$(get_lit_flags)"
+	)
+
+	cmake_src_configure
+}
+
+src_test() {
+	local -x LIT_PRESERVES_TMP=1
+	cmake_build check-lldb-{shell,unit}
+	# failures + hangs
+	#use python && cmake_build check-lldb-api
+}
+
+src_install() {
+	cmake_src_install
+	find "${D}" -name '*.a' -delete || die
+
+	use python && python_optimize
+}