app-arch/xar: fix arm and ppc64, bug #650024

Due to a different signedness of char type on arm and ppc, xar wouldn't
start at all on these platforms.  A weird (compiler?) bug caused a
completely random offset to be taken obviously failing any checksums.

Fixes: https://bugs.gentoo.org/650024
Closes: https://bugs.gentoo.org/650024
Package-Manager: Portage-2.3.19, Repoman-2.3.6

app-arch/xar/files/xar-1.8-arm-ppc.patch

@@ -0,0 +1,23 @@
+--- a/lib/archive.c
++++ b/lib/archive.c
+@@ -387,7 +387,8 @@
+ 			return NULL;
+ 		}
+
+-		XAR(ret)->heap_offset = xar_get_heap_offset(ret) + offset;
++		XAR(ret)->heap_offset =
++			XAR(ret)->toc_count + sizeof(xar_header_t) + offset;
+ 		if( lseek(XAR(ret)->fd, XAR(ret)->heap_offset, SEEK_SET) == -1 ) {
+ 			xar_close(ret);
+ 			return NULL;
+--- a/src/xar.c
++++ a/src/xar.c
+@@ -783,7 +783,7 @@
+ int main(int argc, char *argv[]) {
+ 	int ret;
+ 	char *filename = NULL;
+-	char command = 0, c;
++	signed char command = 0, c;
+ 	char **args;
+ 	const char *tocfile = NULL;
+ 	int arglen, i, err;

app-arch/xar/xar-1.8-r1.ebuild

@@ -0,0 +1,47 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+inherit flag-o-matic multilib-minimal ltprune
+
+APPLE_PV=400
+DESCRIPTION="An easily extensible archive format"
+HOMEPAGE="https://opensource.apple.com/source/xar/"
+SRC_URI="https://opensource.apple.com/tarballs/xar/xar-${APPLE_PV}.tar.gz"
+
+LICENSE="BSD-2"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~hppa ~ia64 ~ppc ~ppc64 ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos"
+IUSE="libressl kernel_Darwin"
+
+DEPEND="
+	!kernel_Darwin? (
+		virtual/acl
+		!libressl? ( dev-libs/openssl:0=[${MULTILIB_USEDEP}] )
+		libressl? ( dev-libs/libressl:0=[${MULTILIB_USEDEP}] )
+	)
+	app-arch/bzip2[${MULTILIB_USEDEP}]
+	sys-libs/zlib[${MULTILIB_USEDEP}]
+	dev-libs/libxml2[${MULTILIB_USEDEP}]
+"
+RDEPEND="${DEPEND}"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.6.1-ext2.patch
+	"${FILESDIR}"/${PN}-1.8-safe_dirname.patch
+	"${FILESDIR}"/${PN}-1.8-arm-ppc.patch
+)
+
+S=${WORKDIR}/${PN}-${APPLE_PV}/${PN}
+
+multilib_src_configure() {
+	use kernel_Darwin || append-libs $(pkg-config --libs openssl)
+	ECONF_SOURCE=${S} \
+	econf \
+		--disable-static
+}
+
+multilib_src_install() {
+	default
+	prune_libtool_files
+}