diff --git a/srcpkgs/libcxx/patches/ppc.patch b/srcpkgs/libcxx/patches/ppc.patch
new file mode 100644
index 00000000000..adcb0c57b0d
--- /dev/null
+++ b/srcpkgs/libcxx/patches/ppc.patch
@@ -0,0 +1,22 @@
+This ensures `is_iec559` is defined correctly under all long double ABIs,
+including musl and its 64-bit long double. Also, `__ppc__` or `__ppc64__`
+is not defined on gcc.
+
+--- include/limits
++++ include/limits
+@@ -426,8 +426,14 @@ protected:
+     _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type signaling_NaN() _NOEXCEPT {return __builtin_nansl("");}
+     _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type denorm_min() _NOEXCEPT {return __LDBL_DENORM_MIN__;}
+ 
+-#if (defined(__ppc__) || defined(__ppc64__))
++#if defined(__powerpc__) || defined(__powerpc64__)
++#if (__LDBL_MAX_EXP__ > __DBL_MAX_EXP__) || (__LDBL_MANT_DIG__ == __DBL_MANT_DIG__)
++    /* IEEE 754 quadruple or double precision */
++    static _LIBCPP_CONSTEXPR const bool is_iec559 = true;
++#else
++    /* 128-bit IBM double-double */
+     static _LIBCPP_CONSTEXPR const bool is_iec559 = false;
++#endif
+ #else
+     static _LIBCPP_CONSTEXPR const bool is_iec559 = true;
+ #endif
diff --git a/srcpkgs/libcxx/template b/srcpkgs/libcxx/template
index df7444a470f..58af53e149e 100644
--- a/srcpkgs/libcxx/template
+++ b/srcpkgs/libcxx/template
@@ -1,13 +1,13 @@
 # Template file for 'libcxx'
 pkgname=libcxx
-version=8.0.0
+version=9.0.0
 revision=1
 wrksrc="${pkgname}-${version}.src"
 build_style=cmake
 configure_args+=" -DLIBCXX_CXX_ABI=libcxxabi -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON
  -DLIBCXX_CXX_ABI_LIBRARY_PATH=${XBPS_CROSS_BASE}/usr/lib
  -DLIBCXXABI_USE_LLVM_UNWINDER=1"
-hostmakedepends="llvm8 python"
+hostmakedepends="llvm9 python3"
 makedepends="libcxxabi-devel llvm llvm-libunwind-devel"
 make_build_args="VERBOSE=1"
 short_desc="New implementation of the C++ standard library, targeting C++11, C++14 and above"
@@ -15,7 +15,7 @@ maintainer="Orphaned <orphan@voidlinux.org>"
 license="NCSA, MIT"
 homepage="https://libcxx.llvm.org"
 distfiles="https://www.llvm.org/releases/${version}/${pkgname}-${version}.src.tar.xz"
-checksum=c2902675e7c84324fb2c1e45489220f250ede016cc3117186785d9dc291f9de2
+checksum=3c4162972b5d3204ba47ac384aa456855a17b5e97422723d4758251acf1ed28c
 
 case "$XBPS_TARGET_MACHINE" in
 	*-musl) configure_args+=" -DLIBCXX_HAS_MUSL_LIBC=YES"