Add ISL (for Graphite) and install the LTO plugin for binutils

gcc.SlackBuild

@@ -150,6 +150,14 @@ tar xvf $CWD/gcc-$VERSION.tar.?z || exit 1
 #  #zcat $CWD/gcc.66782.diff.gz | patch -p0 --verbose || exit 1
 #) || exit 1
 
+# Add ISL to the source
+( cd gcc-$VERSION
+    ISLVER=$(echo $CWD/isl-*.tar.xz | rev | cut -f 3- -d . | cut -f 1 -d - | rev)
+    rm -rf isl isl-$ISLVER
+    tar xvf $CWD/isl-$ISLVER.tar.xz || exit 1
+    mv isl-$ISLVER isl || exit 1
+) || exit 1
+
 # Copy ecj.jar into the TLD of the source. Needed for java compiler.
 # This can be retrieved from ftp://sourceware.org/pub/java
 cp $CWD/ecj-4.9.jar gcc-$VERSION/ecj.jar
@@ -509,6 +517,10 @@ if [ "$ARCH" = "x86_64" ]; then
     $PKG1/usr/lib${LIBDIRSUFFIX}/gcc/${TARGET}/${VERSION}/specs
 fi
 
+# Install liblto_plugin.so for binutils
+mkdir -p $PKG1/usr/lib/bfd-plugins
+ln -sf ../../libexec/gcc/${TARGET}/${VERSION}/liblto_plugin.so $PKG1/usr/lib/bfd-plugins/liblto_plugin.so
+
 #  make ada.install-common DESTDIR=$PKG1
 #  make install-gnatlib DESTDIR=$PKG1
 make -i install-info DESTDIR=$PKG1