Re: [PATCH] tests/tcg: use CONFIG_LINUX_USER, not CONFIG_LINUX

[Peter Maydell <peter.maydell@linaro.org>]

On Fri, 10 Dec 2021 at 09:41, Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> The two more or less overlap, because CONFIG_LINUX is a requirement for Linux
> user-mode emulation.  However, CONFIG_LINUX is technically a host symbol
> that applies even to system emulation.  Defining CONFIG_LINUX_USER, and
> CONFIG_BSD_USER for eventual future use, is cleaner.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  tests/tcg/configure.sh              | 8 +++++++-
>  tests/tcg/multiarch/Makefile.target | 2 +-
>  tests/tcg/x86_64/Makefile.target    | 2 +-
>  3 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/tests/tcg/configure.sh b/tests/tcg/configure.sh
> index 9ef913df5b..f859b61d90 100755
> --- a/tests/tcg/configure.sh
> +++ b/tests/tcg/configure.sh
> @@ -225,8 +225,14 @@ for target in $target_list; do
>    echo "TARGET_NAME=$arch" >> $config_target_mak
>    echo "target=$target" >> $config_target_mak
>    case $target in
> -    *-linux-user | *-bsd-user)
> +    *-linux-user)
>        echo "CONFIG_USER_ONLY=y" >> $config_target_mak
> +      echo "CONFIG_LINUX_USER=y" >> $config_target_mak
> +      echo "QEMU=$PWD/qemu-$arch" >> $config_target_mak
> +      ;;
> +    *-bsd-user)
> +      echo "CONFIG_USER_ONLY=y" >> $config_target_mak
> +      echo "CONFIG_BSD_USER=y" >> $config_target_mak
>        echo "QEMU=$PWD/qemu-$arch" >> $config_target_mak

I note that this is very subtly different from the logic
used in meson.build for setting CONFIG_LINUX_USER,
which uses "target.endswith('linux-user')" without the
leading hyphen...

Vaguely relatedly, gdbstub.c has some ifdefs:
 #if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER)

Is it possible for CONFIG_LINUX_USER to be defined when
CONFIG_USER_ONLY is not, or is the first clause in the #if
redundant?

thanks
-- PMM