PR target/85596 Add --with-multilib-list doc for aarch64

2019-01-18  Christophe Lyon  <christophe.lyon@linaro.org>

	PR target/85596
	* doc/install.texi (with-multilib-list): Document for aarch64.

From-SVN: r268065

gcc/ChangeLog

+2019-01-18  Christophe Lyon  <christophe.lyon@linaro.org>
+
+	PR target/85596
+	* doc/install.texi (with-multilib-list): Document for aarch64.
+
 2019-01-18  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/88734

gcc/doc/install.texi

@@ -1073,10 +1073,19 @@ sysv, aix.
 @itemx --without-multilib-list
 Specify what multilibs to build.  @var{list} is a comma separated list of
 values, possibly consisting of a single value.  Currently only implemented
-for arm*-*-*, riscv*-*-*, sh*-*-* and x86-64-*-linux*.  The accepted
-values and meaning for each target is given below.
+for aarch64*-*-*, arm*-*-*, riscv*-*-*, sh*-*-* and x86-64-*-linux*.  The
+accepted values and meaning for each target is given below.
 
 @table @code
+@item aarch64*-*-*
+@var{list} is a comma separated list of @code{ilp32}, and @code{lp64}
+to enable ILP32 and LP64 run-time libraries, respectively.  If
+@var{list} is empty, then there will be no multilibs and only the
+default run-time library will be built.  If @var{list} is
+@code{default} or --with-multilib-list= is not specified, then the
+default set of libraries is selected based on the value of
+@option{--target}.
+
 @item arm*-*-*
 @var{list} is a comma separated list of @code{aprofile} and
 @code{rmprofile} to build multilibs for A or R and M architecture