how to build multi arch libstdc++

[Zhang hw]

Thank jwakely!
yes , I've compiled my x86_64 with "configure --disable-multilib" for
some compile errors. Is thers a simple way to build the 32bit lib on
my amd64 env now, against re-configure and re-build the whole gcc? It
need 2-3 hours to compile the gcc on my computer.
By the way , I downloaded a precompiled lib package from the fc
website for temporary using , and it looked like worked well.

2013/9/7, Jonathan Wakely <jwakely.gcc@gmail.com>:
> On 7 September 2013 05:11, Zhang hw wrote:
>> Hello , everybody!
>> I have compiled and installed a gcc-4.8.1 with configure
>> --build=x86_64-redhat-linux-gnu.There is a app need 32bit libstdc++
>> now , but there is nothing in "lib" directory , how to build and
>> install it?
>
> x86_64-*-linux-gnu always builds a multilib compiler unless you use
> --disable-multilib
>
>> I have compiled with xxx/libstdc++-v3/configure
>> --target=i686-redhat-linux-gnu and returned success , but after
>> installed it , I've got only the libraries in directory "lib64" ,
>> there was nothing in "lib" directory?
>
> That doesn't make sense, i686-*-linux-gnu is a 32-bit non-multilib target.
>
>> Can I compile and install a 32bit libstdc++ with parameters changing
>> for configure and make install? Or , shall I build a cross compiler
>> first?
>
> As I said, just build on x86_64 without --disable-multilib
>