libcxx: fix xlocale.h forglibc 2.26 and use clang as CC.

srcpkgs/libcxx/patches/glibc-2.26.patch

@@ -0,0 +1,23 @@
+From 6e02e89f65ca1ca1d6ce30fbc557563164dd327e Mon Sep 17 00:00:00 2001
+From: Eric Fiselier <eric@efcs.ca>
+Date: Thu, 3 Aug 2017 04:28:10 +0000
+Subject: [PATCH] Fix libcxx build with glibc 2.26+ by removing xlocale.h
+ include.
+
+Patch by Khem Raj. Reviewed as D35697. Also see PR33729.
+
+
+
+git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@309920 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+--- include/__locale
++++ include/__locale
+@@ -34,7 +34,7 @@
+ # include <support/solaris/xlocale.h>
+ #elif defined(_NEWLIB_VERSION)
+ # include <support/newlib/xlocale.h>
+-#elif (defined(__GLIBC__) || defined(__APPLE__)      || defined(__FreeBSD__) \
++#elif (defined(__APPLE__)      || defined(__FreeBSD__) \
+     || defined(__EMSCRIPTEN__) || defined(__IBMCPP__))
+ # include <xlocale.h>
+ #elif defined(__Fuchsia__)

srcpkgs/libcxx/template

@@ -1,20 +1,21 @@
 # Template file for 'libcxx'
 pkgname=libcxx
 version=4.0.1
-revision=1
+revision=2
 build_style=cmake
-hostmakedepends="python"
+hostmakedepends="clang llvm python"
+makedepends="libcxxabi-devel llvm llvm-libunwind-devel"
 case "$XBPS_TARGET_MACHINE" in
 arm*)
-	# libcxxabi doesn't build on arm.
+	_broken="libcxxabi doesn't build on arm."
 	;;
 *)
 	configure_args+="
 	 -DLIBCXX_CXX_ABI=libcxxabi
 	 -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON
-	 -DLIBCXX_CXX_ABI_LIBRARY_PATH=/usr/lib
+	 -DLIBCXX_CXX_ABI_LIBRARY_PATH=${XBPS_CROSS_BASE}/usr/lib
+	 -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
 	"
-	makedepends="llvm llvm-libunwind-devel libcxxabi-devel"
 	LDFLAGS="-Wl,--no-as-needed -lunwind -Wl,--as-needed"
 esac
 case "$XBPS_TARGET_MACHINE" in
@@ -36,6 +37,18 @@ post_extract() {
 		sed -i 's/!defined(_GCC_MAX_ALIGN_T)/& \&\& !defined(__DEFINED_max_align_t)/' include/stddef.h
 	esac
 }
+pre_configure() {
+	export CC="clang"
+	export CXX="clang++"
+	if [ "$CROSS_BUILD" ]; then
+		for _gccdir in /usr/lib/gcc/$XBPS_CROSS_TRIPLET/*.*.*; do
+			CFLAGS+=" --target=$XBPS_CROSS_TRIPLET --sysroot=/usr/$XBPS_CROSS_TRIPLET -B$_gccdir"
+			CXXFLAGS+=" --target=$XBPS_CROSS_TRIPLET --sysroot=/usr/$XBPS_CROSS_TRIPLET -B$_gccdir"
+			LDFLAGS+=" -L$_gccdir"
+		done
+	fi
+
+}
 libcxx-devel_package() {
 	short_desc+=" - development files"
 	depends="${sourcepkg}>=${version}_${revision}"