rework selection of cuda build architecture

[borg323]

This pull request consists of 3 related parts:

1. Adds support for using -arch=native for cuda code (if nvcc supports it). This is used by default unless -Dnative_cuda=false is passed to the build or code generation for a specific CC is requested with e.g. -Dcc_cuda=50.
2. Disables fp16 cuda code that breaks the build when compiling for a CC less than 5.3 - this is needed to make -arch=native work even on older gpus.
3. Passes -Dnative_cuda=false to appveyor builds in order to generate code for multiple gpu architectures.

[whelanh]

Compiling this using Windows, I received the following error message: meson.build:507:26: ERROR: The == operator of str does not accept objects of type list ([]) meson-log.txt

[borg323]

@whelanh can you try the following fix?

--- a/meson.build
+++ b/meson.build
@@ -484,7 +484,7 @@ if get_option('build_backends')
     if cuda_cc != ''
       nvcc_extra_args = ['-arch=compute_' + cuda_cc, '-code=sm_' + cuda_cc]
     elif get_option('native_cuda') and nvcc_help.contains('-arch=native')
-      nvcc_extra_args = '-arch=native'
+      nvcc_extra_args = ['-arch=native']
     endif
     foreach x : get_option('cudnn_include')
       cuda_arguments += ['-I', x]

[whelanh]

I did try that correction of line 487 changing to:

nvcc_extra_args = ['-arch=native']

and it compiles fine without any errors. Kind regards, Hugh Whelan

On Sat, Jul 29, 2023 at 9:06 PM borg323 @.***> wrote:

@whelanh https://github.com/whelanh can you try the following fix?

--- a/meson.build+++ b/meson.build@@ -484,7 +484,7 @@ if get_option('build_backends') if cuda_cc != '' nvcc_extraargs = ['-arch=compute' + cudacc, '-code=sm' + cuda_cc] elif get_option('native_cuda') and nvcc_help.contains('-arch=native')- nvcc_extra_args = '-arch=native'+ nvcc_extra_args = ['-arch=native'] endif foreach x : get_option('cudnn_include') cuda_arguments += ['-I', x]

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