[Mesa-dev] [PATCH 2/2] configure.ac: refuse to build r300g without LLVM

[Matt Turner]

On Thu, Apr 21, 2011 at 11:39 AM, Marek Olšák <maraeo at gmail.com> wrote:
> ---
>  configure.ac |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index 8e9f73f..84a75c4 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -1778,6 +1778,11 @@ AC_ARG_ENABLE([gallium-r300],
>         [build gallium r300 @<:@default=disabled@:>@])],
>     [enable_gallium_r300="$enableval"],
>     [enable_gallium_r300=auto])
> +if test "x$enable_gallium_r300" != xno; then
> +    if test "x$MESA_LLVM" = x0; then
> +        AC_MSG_ERROR([LLVM is required to build r300g])
> +    fi
> +fi
>  if test "x$enable_gallium_r300" = xauto; then
>     GALLIUM_DRIVERS_DIRS="$GALLIUM_DRIVERS_DIRS r300"
>     gallium_check_st "radeon/drm" "dri-r300"
> --
> 1.7.4.1

How does this affect architectures on which r300g works but don't have
LLVM JIT support? See [1]. (I'm assuming that LLVMpipe requires JIT
support in LLVM). r300g works on Alpha, SPARC, and probably others
that don't have JIT support.

I think the purpose of this patch is to simply prevent downstream
packagers from screwing up SWTCL users, but on, say, Alpha and SPARC,
I don't think SWTCL cards are possible. Does LLVMpipe in addition to
r300g do any good for HWTCL cards?

Matt

[1] http://llvm.org/docs/CodeGenerator.html#targetfeatures