[Buildroot] [PATCH v2 0/3] llvm for mesa3d
Valentin Korenblit
valentin.korenblit at smile.fr
Thu Feb 22 09:04:54 UTC 2018
On 21/02/2018 21:55, Andre Renaud wrote:
> Hi Valentin,
> Thanks for these patches - I've been looking at getting the llvmpipe
> mesa3d driver going on the Dragonboard 410C, which uses the freedreno
> driver. The work you've done here gets me very close, but I'm having
> one last issue I thought you might know something about.
>
> I'm having to patch in a change to enable this for AARCH64 on top of
> the changes that you've made, but it looks like I'm ending up with the
> LLVM tools generating output for the host architecture,
> x86_64-unknown-linux-gnu, rather than the target architecture. As such
> I'm getting the "No available targets are compatible with this triple"
> error when llvmpipe gets initialised.
>
Hi Andre,
Today I will start working on aarch64, so I'll check that. I guess that
error should be related to TARGETS_TO_BUILD.
> The changes I made to enable compilation were:
> --- a/package/llvm/Config.in2018-02-22 09:49:46.635210136 +1300
> +++ b/package/llvm/Config.in2018-02-21 11:49:39.638970682 +1300
> @@ -3,11 +3,12 @@
> #
> http://llvm.org/docs/GettingStarted.html#host-c-toolchain-both-compiler-and-standard-library
> # http://llvm.org/docs/GettingStarted.html#local-llvm-configuration
> depends on BR2_HOST_GCC_AT_LEAST_4_8
> -default y if BR2_i386 || BR2_x86_64
> +default y if BR2_i386 || BR2_x86_64 || BR2_aarch64
> config BR2_PACKAGE_LLVM_TARGET_ARCH
> string
> default "X86" if BR2_i386 || BR2_x86_64
> +default "AArch64" if BR2_aarch64
> config BR2_PACKAGE_LLVM
> bool "llvm"
>
Your changes are ok, it shouldn't be necessary to do other
modifications, but I haven't tested it yet.
> In addition I've tried tinkering with LLVM_NATIVE_ARCH, and
> LLVM_TARGET_TRIPLE_ENV, but haven't had much luck.
>
> I don't suppose you have any thoughts on what I might have missed? I'm
> assuming that there is some confusion over the host llvm vs. the
> target. I appreciate that your initial patch targeted x86 only, so if
> you're still working on the ARM support then it may be easiest if I
> wait on that.
I will keep you up to date.
>
> Regards,
> Andre
>
> On Tue, 20 Feb 2018 at 06:18 Valentin Korenblit
> <valentin.korenblit at smile.fr <mailto:valentin.korenblit at smile.fr>> wrote:
>
> Hello all,
>
> This series provides LLVM support for Mesa3d, enabling
> llvmpipe software rasterizer.
>
> It must be considered that it does not provide a full LLVM
> installation for the host, only the necessary components to
> cross-compile LLVM for the target. It will install all target
> components as libLLVM.so.
>
> Changes in v2:
>
> The series has been simplified:
>
> *Build only backend for target architecture by default.
>
> *Support for AMDGPU(PATCH 3/4 in v1) was removed because I cannot test
> it currently.
>
> *Host: make options modified to build only llvm-config and llvm-tblgen
> (reduces drastically build time for host).
>
> *Target: support only x86 currently (tested), I will test on ARM soon.
>
>
> The idea is to add incrementally more options to configure LLVM as
> soon
> as I can test them.
>
> Regards,
>
> Valentín
>
>
> Romain Naour (3):
> package/llvm: new host package
> package/llvm: enable target variant
> package/mesa3d: enable llvm support
>
> package/Config.in | 1 +
> package/Config.in.host | 1 +
> package/llvm/Config.in | 19 +++
> package/llvm/Config.in.host | 8 +
> package/llvm/llvm.hash | 2 +
> package/llvm/llvm.mk <http://llvm.mk> | 360
> ++++++++++++++++++++++++++++++++++++++++++++
> package/mesa3d/Config.in | 8 +
> package/mesa3d/mesa3d.mk <http://mesa3d.mk> | 18 ++-
> 8 files changed, 414 insertions(+), 3 deletions(-)
> create mode 100644 package/llvm/Config.in
> create mode 100644 package/llvm/Config.in.host
> create mode 100644 package/llvm/llvm.hash
> create mode 100644 package/llvm/llvm.mk <http://llvm.mk>
>
> --
> 2.14.3
>
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Best regards,
Valentín
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