[Mesa-stable] [PATCH v2] st: require compatible driver in autotools

[Alyssa Ross]

> if test -n "$with_gallium_drivers" -a "x$with_gallium_drivers" != xswrast; then
>     if test "x$enable_xvmc" = xauto -a "x$have_xvmc_platform" = xyes; then
>         PKG_CHECK_EXISTS([xvmc >= $XVMC_REQUIRED], [enable_xvmc=yes],
> [enable_xvmc=no])
>     fi
> ...
> fi
>
> Thus auto-detection will disable xvmc and other VL state-trackers,
> when no gallium drivers or swrast only is set.
> Thus the NEED_GALLIUM_VL_WINSYS shortly afterwords is set to
> no/disabled, and vl_winsys_dri.c et al is not build.

Perhaps I wasn't clear in my initial message. It's not an autodetection
issue, it's that there is no error when trying to use, say,
--enable-omx-bellagio when there's only an swrast driver.

> A random old checkout commit 7be26976b8e8bc34fa7d55550014197ed2af488f
> seems happy with the following:
>
> mkdir aa; cd aa;
> ../autogen.sh      --enable-autotools \
>      --with-platforms=x11 \
>      --with-dri-drivers= \
>      --with-gallium-drivers=swrast \
>      --disable-glx \
>      --disable-dri3 \
>      --disable-gbm
>
> Am I missing something?

If you try adding --enable-omx-bellagio, I think you should see the
configure script run successfully, despite the incompatibility between
--with-gallium-drivers=swrast and --enable-omx-bellagio that it should
have caught.
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