Re: [dpdk-dev] [PATCH] test-meson-builds: add a 32-bit build

[Thomas Monjalon <thomas@monjalon.net>]

05/11/2020 12:07, Bruce Richardson:
> It's reasonably common for patches to have issues when built on 32-bits, so
> to prevent this, we can add a 32-bit build (if supported) to the
> "test-meson-builds.sh" script. The tricky bit is using a valid
> PKG_CONFIG_LIBDIR, so for now we use two common possibilities for where that
> should point to in order to get a successful build.
> 
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

Thanks we really need such test.

> +if echo "int main(void) { return 0; }" | cc -m32 -x c - -o /dev/null 2> /dev/null ; then

I think a function would be cleaner, with -m32 passed as parameter.

> +	if [ -d "/usr/lib/i386-linux-gnu" ] ; then
> +		# 32-bit pkgconfig on debian/ubuntu
> +		export PKG_CONFIG_LIBDIR="/usr/lib/i386-linux-gnu/pkgconfig"
> +	else
> +		# 32-bit pkgconfig on RHEL/fedora (lib vs lib64)
> +		export PKG_CONFIG_LIBDIR="/usr/lib/pkgconfig"

It is /usr/lib32 on my Arch Linux.

I would prefer avoiding export,
by assigning a local variable and use it below:

PKG_CONFIG_LIBDIR=libdir32 build build-32-bit ...

> +	fi
> +	build build-32-bit cc -Dc_args='-m32' -Dc_link_args='-m32'

Or just "build-32" as directory name.

> +	unset PKG_CONFIG_LIBDIR

No need of unset if not using export above.

> +fi