[Buildroot] [PATCH v4 03/11] package/llvm: enable AMDGPU
Arnout Vandecappelle
arnout at mind.be
Fri Mar 30 18:08:28 UTC 2018
On 30-03-18 11:02, Thomas Petazzoni wrote:
> Hello Valentin,
>
> On Thu, 29 Mar 2018 13:33:38 +0200, Valentin Korenblit wrote:
>
>> +config BR2_PACKAGE_LLVM_AMDGPU
>> + bool "AMDGPU backend"
>> + depends on BR2_PACKAGE_LLVM
>> + help
>> + Build AMDGPU target. Select this option if you are going
>> + to install mesa3d with llvm and use Gallium Radeon driver.
>> diff --git a/package/llvm/llvm.mk b/package/llvm/llvm.mk
>> index 4e58c96e0f..c819487bdf 100644
>> --- a/package/llvm/llvm.mk
>> +++ b/package/llvm/llvm.mk
>> @@ -226,9 +226,15 @@ LLVM_CONF_OPTS += -DLLVM_BUILD_EXTERNAL_COMPILER_RT=OFF
>> # Get target architecture
>> HOST_LLVM_TARGET_ARCH = $(call qstrip,$(BR2_PACKAGE_LLVM_TARGET_ARCH))
>>
>> +# Build AMDGPU backend
>> +ifeq ($(BR2_PACKAGE_LLVM_AMDGPU),y)
>> +HOST_LLVM_CONF_OPTS += -DLLVM_TARGETS_TO_BUILD="$(HOST_LLVM_TARGET_ARCH);AMDGPU"
>> +LLVM_CONF_OPTS += -DLLVM_TARGETS_TO_BUILD="$(HOST_LLVM_TARGET_ARCH);AMDGPU"
>
> It feels non-natural that a target Config.in option
> (BR2_PACKAGE_LLVM_AMDGPU) affect the build of the host variant of the
> LLVM package. Is this really intended and necessary ? I.e do you need
> AMDGPU support in the host LLVM variant for it to work in the target
> LLVM ?
>
>> +else
>> # Build backend for target architecture
>> HOST_LLVM_CONF_OPTS += -DLLVM_TARGETS_TO_BUILD="$(HOST_LLVM_TARGET_ARCH)"
>> LLVM_CONF_OPTS += -DLLVM_TARGETS_TO_BUILD="$(HOST_LLVM_TARGET_ARCH)"
>> +endif
>
> This doesn't look like a very extensible solution.
>
> What about instead:
>
> LLVM_TARGETS_TO_BUILD = $(HOST_LLVM_TARGET_ARCH)
>
> ifeq ($(BR2_PACKAGE_LLVM_AMDGPU),y)
> LLVM_TARGETS_TO_BUILD := $(LLVM_TARGETS_TO_BUILD);AMDGPU
> endif
>
> and then use LLVM_TARGETS_TO_BUILD to pass -DLLVM_TARGETS_TO_BUILD.
Or maybe
LLVM_TARGETS_TO_BUILD = $(HOST_LLVM_TARGET_ARCH)
ifeq ($(BR2_PACKAGE_LLVM_AMDGPU),y)
LLVM_TARGETS_TO_BUILD += AMDGPU
endif
LLVM_CONF_OPTS = -DLLVM_TARGETS_TO_BUILD=$(subst
$(space),;,$(LLVM_TARGETS_TO_BUILD))
Or is that too much GNUmake black magic?
Regards,
Arnout
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
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