Matheus Kowalczuk Ferst <matheus.fe...@eldorado.org.br> writes:
> On 01/06/2022 15:05, Alex Bennée wrote:
>> From: Paolo Bonzini <pbonz...@redhat.com>
>>
>> In preparation for handling more binaries than just cc, handle
>> the case of "probe_target_compiler $cpu" directly in the function,
>> setting the target_* variables based on the ones that are used to
>> build QEMU. The clang check also needs to be moved after this
>> fallback.
>>
>> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
>> Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
>> Message-Id: <20220517092616.1272238-10-pbonz...@redhat.com>
>> Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
>> Message-Id: <20220527153603.887929-21-alex.ben...@linaro.org>
>
> Hi,
>
> After this patch, a clean build in ppc64le hosts will not build
> ppc64{,le}-linux-user tests with "make check-tcg"
>
>>
>> diff --git a/configure b/configure
>> index fbf6d39f96..217c8b3cac 100755
>> --- a/configure
>> +++ b/configure
>> @@ -954,10 +954,6 @@ case $git_submodules_action in
>> ;;
>> esac
>>
>> -if eval test -z "\${cross_cc_$cpu}"; then
>> - eval "cross_cc_${cpu}=\$cc"
>> -fi
>> -
>> default_target_list=""
>> mak_wilds=""
>>
>> @@ -2008,13 +2004,6 @@ probe_target_compiler() {
>> if eval test -n "\"\${cross_cc_$1}\""; then
>> if eval has "\"\${cross_cc_$1}\""; then
>> eval "target_cc=\"\${cross_cc_$1}\""
>> - case $1 in
>> - i386|x86_64)
>> - if $target_cc --version | grep -qi "clang"; then
>> - unset target_cc
>> - fi
>> - ;;
>> - esac
>> fi
>> fi
>> if eval test -n "\"\${cross_as_$1}\""; then
>> @@ -2027,6 +2016,20 @@ probe_target_compiler() {
>> eval "target_ld=\"\${cross_ld_$1}\""
>> fi
>> fi
>> + if test "$1" = $cpu; then > + : ${target_cc:=$cc}
>> + : ${target_as:=$as}
>> + : ${target_ld:=$ld}
>> + fi
>
> $cpu is normalized[1] to ppc64 on little-endian hosts, so
> ppc64le-linux-user will not have $target_{cc,as,ld} set, and
> ppc64-linux-user will have them set to a toolchain that may not support
> -mbig-endian. I suppose we have a similar problem with MIPS targets on
> MIPS hosts.
For now you can always explicitly tell configure about the host compiler
with:
--cross-cc-ppc64le=gcc
but we should fix the broken detection. It seems the var cpu has an
overloaded meaning so I wonder if we just need an explicit host_cpu
setting when we normalize cpu?
>
> [1]
> https://gitlab.com/qemu-project/qemu/-/blob/2ad60f6f8c12ca0acd8834fdd70e088361b8791f/configure#L611
--
Alex Bennée
