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

[Christophe Lyon <christophe.lyon@linaro.org>]

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Hi,

This small patch adds a short description of --with-multilib-list for aarch64.
OK?

Thanks,

Christophe

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2019-01-07  Christophe Lyon  <christophe.lyon@linaro.org>

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


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diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 5cf007b..d2bf21d 100644
--- a/gcc/doc/install.texi
+++ b/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