upstream release

manually specify the includedir inside the sysroot to adapt to *-glibc change
make some long lines a bit prettier

PKGBUILD

 # Maintainer: Anatol Pomozov <anatol.pomozov@gmail.com>
+# Maintainer: Eli Schwartz <eschwartz@archlinux.org>
 
 _target=aarch64-linux-gnu
 pkgname=$_target-gcc
-pkgver=8.3.0
-_islver=0.20
+pkgver=9.1.0
+_islver=0.21
 pkgrel=1
 #_snapshot=8-20190111
 pkgdesc='The GNU Compiler Collection - cross compiler for ARM64 target'
@@ -16,9 +17,9 @@ options=(!emptydirs !strip staticlibs)
 source=(https://ftp.gnu.org/gnu/gcc/gcc-$pkgver/gcc-$pkgver.tar.xz{,.sig}
         #https://gcc.gnu.org/pub/gcc/snapshots/$_snapshot/gcc-$_snapshot.tar.xz
         http://isl.gforge.inria.fr/isl-$_islver.tar.bz2)
-sha256sums=('64baadfe6cc0f4947a84cb12d7f0dfaf45bb58b7e92461639596c21e02d97d2c'
+sha256sums=('79a66834e96a6050d8fe78db2c3b32fb285b230b855d0a66288235bc04b327a0'
             'SKIP'
-            'b587e083eb65a8b394e833dea1744f21af3f0e413a448c17536b5549ae42a4c2')
+            'd18ca11f8ad1a39ab6d03d3dcb3365ab416720fcb65b42d69f34f51bf0a0e859')
 validpgpkeys=(33C235A34C46AA3FFB293709A328C3A2C3C45C06) # Jakub Jelinek <jakub@redhat.com>
 
 if [ -n "$_snapshot" ]; then
@@ -41,8 +42,8 @@ prepare() {
   # hack! - some configure tests for header files using "$CPP $CPPFLAGS"
   sed -i "/ac_cpp=/s/\$CPPFLAGS/\$CPPFLAGS -O2/" "$srcdir"/$_basedir/{libiberty,gcc}/configure
 
-  rm -rf $srcdir/gcc-build
-  mkdir $srcdir/gcc-build
+  rm -rf "$srcdir"/gcc-build
+  mkdir "$srcdir"/gcc-build
 }
 
 build() {
@@ -53,12 +54,13 @@ build() {
   CFLAGS=${CFLAGS/-pipe/}
   CXXFLAGS=${CXXFLAGS/-pipe/}
 
-  $srcdir/$_basedir/configure \
+  "$srcdir"/$_basedir/configure \
       --prefix=/usr \
       --program-prefix=$_target- \
       --with-local-prefix=/usr/$_target \
       --with-sysroot=/usr/$_target \
       --with-build-sysroot=/usr/$_target \
+      --with-native-system-header-dir=/include \
       --libdir=/usr/lib --libexecdir=/usr/lib \
       --target=$_target --host=$CHOST --build=$CHOST \
       --disable-nls \
@@ -79,10 +81,14 @@ build() {
 package() {
   cd gcc-build
 
-  make DESTDIR="$pkgdir" install-gcc install-target-libgcc install-target-libstdc++-v3 install-target-libgomp install-target-libgfortran install-target-libquadmath
+  make DESTDIR="$pkgdir" install-gcc install-target-{libgcc,libstdc++-v3,libgomp,libgfortran,libquadmath}
 
   # strip target binaries
-  find "$pkgdir"/usr/lib/gcc/$_target/ "$pkgdir"/usr/$_target/lib -type f -and \( -name \*.a -or -name \*.o \) -exec $_target-objcopy -R .comment -R .note -R .debug_info -R .debug_aranges -R .debug_pubnames -R .debug_pubtypes -R .debug_abbrev -R .debug_line -R .debug_str -R .debug_ranges -R .debug_loc '{}' \;
+  find "$pkgdir"/usr/lib/gcc/$_target/ "$pkgdir"/usr/$_target/lib \
+       -type f -and \( -name \*.a -or -name \*.o \) \
+       -exec $_target-objcopy -R .comment -R .note -R .debug_info -R .debug_aranges \
+           -R .debug_pubnames -R .debug_pubtypes -R .debug_abbrev -R .debug_line \
+           -R .debug_str -R .debug_ranges -R .debug_loc '{}' \;
 
   # strip host binaries
   find "$pkgdir"/usr/bin/ "$pkgdir"/usr/lib/gcc/$_target/ -type f -and \( -executable \) -exec strip '{}' \;