Re: [PATCH] configure: Fail when specified cross compiler cannot be found

[Gustavo Romero]

Hi Alex,

On 12/16/20 7:51 AM, Alex Bennée wrote:
> Gustavo Romero <gromero@linux.ibm.com> writes:
>
> > Currently if the cross compiler passed to 'configure' (--cross-cc-<arch>) does
> > not exist no error happens and only later when the TCG tests are run they fail
> > because the cross compiler is not set correctly.
>
> Do they? They should just skip because of a non-existing compiler and a
> failed fallback to using docker:
>
>    ../../configure --disable-docs --target-list=aarch64-softmmu 
> --cross-cc-aarch64=nonexisting_gcc
>
> and then cat ./tests/tcg/config-aarch64-softmmu.mak
>
>    # Automatically generated by configure - do not modify
>    TARGET_NAME=aarch64
>    CONFIG_SOFTMMU=y
>    QEMU=/home/alex/lsrc/qemu.git/builds/bisect/qemu-system-aarch64
>    CROSS_CC_GUEST_CFLAGS=
>    DOCKER_IMAGE=debian-arm64-test-cross
>    DOCKER_CROSS_CC_GUEST=aarch64-linux-gnu-gcc-10
>
> So what do you see in your failing case?

I get the following (I don't have docker installed):

$  ../configure --disable-docs --target-list=aarch64-softmmu 
--cross-cc-aarch64=nonexisting_gcc
gromero@pub:~/git/qemu/build$ cat ./tests/tcg/config-aarch64-softmmu.mak
# Automatically generated by configure - do not modify
TARGET_NAME=aarch64
CONFIG_SOFTMMU=y
QEMU=/home/gromero/git/qemu/build/qemu-system-aarch64
CROSS_CC_GUEST_CFLAGS=

$ ../configure --disable-docs --target-list=ppc64-softmmu 
--cross-cc-ppc64=nonexisting_gcc
gromero@pub:~/git/qemu/build$ cat ./tests/tcg/config-ppc64-softmmu.mak
# Automatically generated by configure - do not modify
TARGET_NAME=ppc64
CONFIG_SOFTMMU=y
QEMU=/home/gromero/git/qemu/build/qemu-system-ppc64
CROSS_CC_GUEST_CFLAGS=
CROSS_CC_GUEST_STATIC=y
CROSS_CC_GUEST=powerpc-linux-gnu-gcc

hrm It seems PPC64 is even assuming some default gcc...

I'm at commit af3f37319c from Dec 15.

I'm wondering if tha happens because I don't have docker package installed.

Anyway, should we at least say we're using Docker as fallback?


Cheers,
Gustavo