diff --git a/sys-devel/clang-common/clang-common-15.0.5.ebuild b/sys-devel/clang-common/clang-common-15.0.5.ebuild
index 2fdf615be8185..ee4c708e9f3c9 100644
--- a/sys-devel/clang-common/clang-common-15.0.5.ebuild
+++ b/sys-devel/clang-common/clang-common-15.0.5.ebuild
@@ -12,7 +12,7 @@ LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA"
 SLOT="0"
 KEYWORDS="amd64 arm arm64 ppc ppc64 ~riscv sparc x86 ~amd64-linux ~ppc-macos ~x64-macos"
 IUSE="
-	default-compiler-rt default-libcxx default-lld llvm-libunwind
+	default-compiler-rt default-libcxx default-lld ieee-long-double llvm-libunwind
 	stricter
 "
 
@@ -88,6 +88,19 @@ src_install() {
 		@gentoo-gcc-install.cfg
 	EOF
 
+	# needed until https://reviews.llvm.org/D117181#3266224 is done.
+	# silently drop support on musl even if enabled, it does not support it.
+	if use ppc64 && use ieee-long-double && ! use elibc_musl; then
+		newins - gentoo-ppc64le-ieeelongdouble.cfg <<-EOF
+			# This file forces 128bit long double on ppc64le systems.
+			-mabi=ieeelongdouble
+		EOF
+
+		cat >> "${ED}/etc/clang/gentoo-common.cfg" <<-EOF || die
+			@gentoo-ppc64le-ieeelongdouble.cfg
+		EOF
+	fi
+
 	if use stricter; then
 		newins - gentoo-stricter.cfg <<-EOF
 			# This file increases the strictness of older clang versions
diff --git a/sys-devel/clang-common/clang-common-15.0.6.9999.ebuild b/sys-devel/clang-common/clang-common-15.0.6.9999.ebuild
index 3e43f51a0aab5..748263e37efa0 100644
--- a/sys-devel/clang-common/clang-common-15.0.6.9999.ebuild
+++ b/sys-devel/clang-common/clang-common-15.0.6.9999.ebuild
@@ -12,7 +12,7 @@ LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA"
 SLOT="0"
 KEYWORDS=""
 IUSE="
-	default-compiler-rt default-libcxx default-lld llvm-libunwind
+	default-compiler-rt default-libcxx default-lld ieee-long-double llvm-libunwind
 	stricter
 "
 
@@ -88,6 +88,19 @@ src_install() {
 		@gentoo-gcc-install.cfg
 	EOF
 
+	# needed until https://reviews.llvm.org/D117181#3266224 is done.
+	# silently drop support on musl even if enabled, it does not support it.
+	if use ppc64 && use ieee-long-double && ! use elibc_musl; then
+		newins - gentoo-ppc64le-ieeelongdouble.cfg <<-EOF
+			# This file forces 128bit long double on ppc64le systems.
+			-mabi=ieeelongdouble
+		EOF
+
+		cat >> "${ED}/etc/clang/gentoo-common.cfg" <<-EOF || die
+			@gentoo-ppc64le-ieeelongdouble.cfg
+		EOF
+	fi
+
 	if use stricter; then
 		newins - gentoo-stricter.cfg <<-EOF
 			# This file increases the strictness of older clang versions
diff --git a/sys-devel/clang-common/clang-common-15.0.6.ebuild b/sys-devel/clang-common/clang-common-15.0.6.ebuild
index e681aa13cd6da..ed38534ff2894 100644
--- a/sys-devel/clang-common/clang-common-15.0.6.ebuild
+++ b/sys-devel/clang-common/clang-common-15.0.6.ebuild
@@ -12,7 +12,7 @@ LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA"
 SLOT="0"
 KEYWORDS="amd64 ~arm arm64 ~ppc ~ppc64 ~riscv ~sparc ~x86 ~amd64-linux ~ppc-macos ~x64-macos"
 IUSE="
-	default-compiler-rt default-libcxx default-lld llvm-libunwind
+	default-compiler-rt default-libcxx default-lld ieee-long-double llvm-libunwind
 	stricter
 "
 
@@ -88,6 +88,19 @@ src_install() {
 		@gentoo-gcc-install.cfg
 	EOF
 
+	# needed until https://reviews.llvm.org/D117181#3266224 is done.
+	# silently drop support on musl even if enabled, it does not support it.
+	if use ppc64 && use ieee-long-double && ! use elibc_musl; then
+		newins - gentoo-ppc64le-ieeelongdouble.cfg <<-EOF
+			# This file forces 128bit long double on ppc64le systems.
+			-mabi=ieeelongdouble
+		EOF
+
+		cat >> "${ED}/etc/clang/gentoo-common.cfg" <<-EOF || die
+			@gentoo-ppc64le-ieeelongdouble.cfg
+		EOF
+	fi
+
 	if use stricter; then
 		newins - gentoo-stricter.cfg <<-EOF
 			# This file increases the strictness of older clang versions
diff --git a/sys-devel/clang-common/clang-common-16.0.0.9999.ebuild b/sys-devel/clang-common/clang-common-16.0.0.9999.ebuild
index e9669ee1adcc4..efd64f57046cc 100644
--- a/sys-devel/clang-common/clang-common-16.0.0.9999.ebuild
+++ b/sys-devel/clang-common/clang-common-16.0.0.9999.ebuild
@@ -12,7 +12,7 @@ LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA"
 SLOT="0"
 KEYWORDS=""
 IUSE="
-	default-compiler-rt default-libcxx default-lld llvm-libunwind
+	default-compiler-rt default-libcxx default-lld ieee-long-double llvm-libunwind
 	stricter
 "
 
@@ -88,6 +88,19 @@ src_install() {
 		@gentoo-gcc-install.cfg
 	EOF
 
+	# needed until https://reviews.llvm.org/D117181#3266224 is done.
+	# silently drop support on musl even if enabled, it does not support it.
+	if use ppc64 && use ieee-long-double && ! use elibc_musl; then
+		newins - gentoo-ppc64le-ieeelongdouble.cfg <<-EOF
+			# This file forces 128bit long double on ppc64le systems.
+			-mabi=ieeelongdouble
+		EOF
+
+		cat >> "${ED}/etc/clang/gentoo-common.cfg" <<-EOF || die
+			@gentoo-ppc64le-ieeelongdouble.cfg
+		EOF
+	fi
+
 	if use stricter; then
 		newins - gentoo-stricter.cfg <<-EOF
 			# This file increases the strictness of older clang versions
diff --git a/sys-devel/clang-common/clang-common-16.0.0_pre20221210.ebuild b/sys-devel/clang-common/clang-common-16.0.0_pre20221210.ebuild
index 0df5a88a9a098..e8dbca1bdc0f4 100644
--- a/sys-devel/clang-common/clang-common-16.0.0_pre20221210.ebuild
+++ b/sys-devel/clang-common/clang-common-16.0.0_pre20221210.ebuild
@@ -12,7 +12,7 @@ LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA"
 SLOT="0"
 KEYWORDS="~loong"
 IUSE="
-	default-compiler-rt default-libcxx default-lld llvm-libunwind
+	default-compiler-rt default-libcxx default-lld ieee-long-double llvm-libunwind
 	stricter
 "
 
@@ -88,6 +88,19 @@ src_install() {
 		@gentoo-gcc-install.cfg
 	EOF
 
+	# needed until https://reviews.llvm.org/D117181#3266224 is done.
+	# silently drop support on musl even if enabled, it does not support it.
+	if use ppc64 && use ieee-long-double && ! use elibc_musl; then
+		newins - gentoo-ppc64le-ieeelongdouble.cfg <<-EOF
+			# This file forces 128bit long double on ppc64le systems.
+			-mabi=ieeelongdouble
+		EOF
+
+		cat >> "${ED}/etc/clang/gentoo-common.cfg" <<-EOF || die
+			@gentoo-ppc64le-ieeelongdouble.cfg
+		EOF
+	fi
+
 	if use stricter; then
 		newins - gentoo-stricter.cfg <<-EOF
 			# This file increases the strictness of older clang versions
diff --git a/sys-devel/clang-common/clang-common-16.0.0_pre20221217.ebuild b/sys-devel/clang-common/clang-common-16.0.0_pre20221217.ebuild
index 0df5a88a9a098..e8dbca1bdc0f4 100644
--- a/sys-devel/clang-common/clang-common-16.0.0_pre20221217.ebuild
+++ b/sys-devel/clang-common/clang-common-16.0.0_pre20221217.ebuild
@@ -12,7 +12,7 @@ LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA"
 SLOT="0"
 KEYWORDS="~loong"
 IUSE="
-	default-compiler-rt default-libcxx default-lld llvm-libunwind
+	default-compiler-rt default-libcxx default-lld ieee-long-double llvm-libunwind
 	stricter
 "
 
@@ -88,6 +88,19 @@ src_install() {
 		@gentoo-gcc-install.cfg
 	EOF
 
+	# needed until https://reviews.llvm.org/D117181#3266224 is done.
+	# silently drop support on musl even if enabled, it does not support it.
+	if use ppc64 && use ieee-long-double && ! use elibc_musl; then
+		newins - gentoo-ppc64le-ieeelongdouble.cfg <<-EOF
+			# This file forces 128bit long double on ppc64le systems.
+			-mabi=ieeelongdouble
+		EOF
+
+		cat >> "${ED}/etc/clang/gentoo-common.cfg" <<-EOF || die
+			@gentoo-ppc64le-ieeelongdouble.cfg
+		EOF
+	fi
+
 	if use stricter; then
 		newins - gentoo-stricter.cfg <<-EOF
 			# This file increases the strictness of older clang versions
diff --git a/sys-devel/clang-common/metadata.xml b/sys-devel/clang-common/metadata.xml
index 7ea033c083c9c..8eb8b3420e8e7 100644
--- a/sys-devel/clang-common/metadata.xml
+++ b/sys-devel/clang-common/metadata.xml
@@ -11,6 +11,7 @@
 		<flag name="default-compiler-rt">Use compiler-rt + libunwind instead of libgcc as the default rtlib for clang</flag>
 		<flag name="default-libcxx">Use libc++ instead of libstdc++ as the default stdlib for clang</flag>
 		<flag name="default-lld">Use lld as the default linker for clang</flag>
+		<flag name="ieee-long-double">Use accelerated 128-bit IEEE long double ABI (ppc64le only)</flag>
 		<flag name="stricter">Default to stricter behavior known from newer clang versions, turning more warnings into errors</flag>
 	</use>
 </pkgmetadata>