[Buildroot] Generating a 32-bit toolchain on a 64-bit machine

[Buildroot] Generating a 32-bit toolchain on a 64-bit machine

[Thomas De Schampheleire]

Hi,

I would like to create a 32-bit toolchain on a 64-bit machine with
buildroot/crosstool-ng. By default, all host tools will be 64-bit.

I couldn't find a configuration option or the like for this.
I guess one way to do is it to call 'make' like this:
make HOSTCC="`which gcc` -m32" HOSTCXX="`which g++` -m32" HOSTCPP="cpp
-m32" HOSTLD="ld -m32"
but ideally there'd be a configuration for this.

In crosstool-ng I didn't find such an option either...

Thanks for your advice,
Thomas
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[Buildroot] Generating a 32-bit toolchain on a 64-bit machine

[Thomas Petazzoni]

Le Mon, 2 Jan 2012 16:42:01 +0100,
Thomas De Schampheleire <patrickdepinguin+buildroot@gmail.com> a ?crit :

> In crosstool-ng I didn't find such an option either...

I did so with crosstool-ng. I created a Debian 32 bits chroot on my 64
bits machine and did the build in here. I had to force ABI=32 to
the ./configure script of GMP to get it to build properly, though,
since it gets confused by the fact of having a 64 bits kernel and a 32
bits userspace. My reason for using a chroot is also because I wanted
the toolchain to be built against an old version of the C library, so
as to be compatible with as many hosts as possible.

Regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com