Re: [RFC PATCH] configure: don't try a "native" cross for i386

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, Nov 16, 2023 at 05:28:20PM +0000, Alex Bennée wrote:
> As 32 bit x86 become rarer we are starting to run into problems with
> search paths. Although we switched to a Debian container we still
> favour the native CC on a Bookworm host. As a result we have a broken
> cross compile setup which then fails to build with:
> 
>     BUILD   i386-linux-user guest-tests
>   In file included from /usr/include/linux/stat.h:5,
>                    from /usr/include/bits/statx.h:31,
>                    from /usr/include/sys/stat.h:465,
>                    from /home/alex/lsrc/qemu.git/tests/tcg/multiarch/linux/linux-test.c:28:
>   /usr/include/linux/types.h:5:10: fatal error: asm/types.h: No such file or directory
>       5 | #include <asm/types.h>
>         |          ^~~~~~~~~~~~~
>   compilation terminated.
>   make[1]: *** [Makefile:119: linux-test] Error 1
>   make: *** [/home/alex/lsrc/qemu.git/tests/Makefile.include:50: build-tcg-tests-i386-linux-user] Error 2
> 
> So lets stop trying to be cute and honour cross_prefix_i386 when
> searching locally. We also need to ensure we are using the correct
> prefix if we do end up using the container version. We can also drop
> the extra CFLAGS while we are at it.
> 
> Fixes: 791e6fedc5 (tests/docker: replace fedora-i386 with debian-i686)
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> ---
>  configure | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

> 
> diff --git a/configure b/configure
> index 5e7b76e3a1..2343d629ec 100755
> --- a/configure
> +++ b/configure
> @@ -1190,7 +1190,6 @@ fi
>  : ${cross_cc_cflags_armeb="-mbig-endian"}
>  : ${cross_cc_hexagon="hexagon-unknown-linux-musl-clang"}
>  : ${cross_cc_cflags_hexagon="-mv73 -O2 -static"}
> -: ${cross_cc_cflags_i386="-m32"}
>  : ${cross_cc_cflags_ppc="-m32 -mbig-endian"}
>  : ${cross_cc_cflags_ppc64="-m64 -mbig-endian"}
>  : ${cross_cc_ppc64le="$cross_cc_ppc64"}
> @@ -1308,7 +1307,7 @@ probe_target_compiler() {
>          ;;
>        i386)
>          container_image=debian-i686-cross
> -        container_cross_prefix=
> +        container_cross_prefix=i686-linux-gnu-
>          ;;
>        loongarch64)
>          container_image=debian-loongarch-cross
> @@ -1394,7 +1393,6 @@ probe_target_compiler() {
>    case "$target_arch:$cpu" in
>      aarch64_be:aarch64 | \
>      armeb:arm | \
> -    i386:x86_64 | \
>      mips*:mips64 | \
>      ppc*:ppc64 | \
>      sparc:sparc64 | \

I kinda wonder if we have people using the rest of this arch compat
stuff too ? With debian making it easy to parallel install the full
cross-arch toolchains + matching libraries, it shouldn't be needed in
general for any arch ?  Getting rid of QEMU specific special cases
like this in configure would be nice.


With regards,
Daniel
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