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add support for riscv64 #752

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Jun 26, 2024
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add support for riscv64 #752

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2 changes: 2 additions & 0 deletions cmake/modules/SwiftSupport.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,8 @@ function(get_swift_host_arch result_var_name)
set("${result_var_name}" "i686" PARENT_SCOPE)
elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "wasm32")
set("${result_var_name}" "wasm32" PARENT_SCOPE)
elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "riscv64")
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It looks like this is just for computing the module triple.
If that's the case, rather than continuing to extend this tower of if statements, would you be okay swapping out the module triple computation for this:

if(NOT SwiftFormat_MODULE_TRIPLE)
  set(module_triple_command "${CMAKE_Swift_COMPILER}" -print-target-info)
  if(CMAKE_Swift_COMPILER_TARGET)
    list(APPEND module_triple_command -target ${CMAKE_Swift_COMPILER_TARGET})
  endif()
  execute_process(COMMAND ${module_triple_command} OUTPUT_VARIABLE target_info_json)
  string(JSON SwiftFormat_MODULE_TRIPLE GET "${target_info_json}" "target" "moduleTriple")
endif()

It scales better and means that this will build for anything that the compiler supports, rather than what we've manually listed out.

Please see the conversation on swiftlang/swift-corelibs-foundation#4959

https://github.com/apple/swift-corelibs-foundation/pull/4959/files#diff-9179d83b9cabd38d5049f3095d2c31d286f406b53443027b1bac119ecc4408c1R38-R54

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@etcwilde, I understand your reasoning for suggesting this change and if this was the only project with this change I would agree.
Unfortunately it is not. This is just one of 19 separate projects in the swift toolchain that require these changes.
https://github.com/orgs/swift-riscv/projects/2
Some of these have already been approved and merged.
For the sake of code conformity across all the different projects I would rather leave this PR as I submitted it if that is acceptable.
Thanks.

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For the ones that have merged, sure, we can update them later when the next architecture comes along.
I think we've hit a critical mass where expecting identical behavior across all of the repos is unlikely to happen and I would prefer to see incremental improvements over time over not improving anything to keep uniformity.
Sort of like how LLVM rolls out changes to policies, instead of making a gigantic patch that updates all of the code, folks are supposed to clean up the code around what they're working on.

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@etcwilde so you are refusing to accept this PR as is?
If so, please state this clearly so I can take further action.

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Yes, I have requested changes and given my reasoning.

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@etcwilde thats unfortunate.

set("${result_var_name}" "riscv64" PARENT_SCOPE)
else()
message(FATAL_ERROR "Unrecognized architecture on host system: ${CMAKE_SYSTEM_PROCESSOR}")
endif()
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