6e4e181c83
Compute the cmake system name from the target triple, rather than passing through the host's. This is primarily to stop forwarding OSX specific cmake variables. This fixes build failures when trying to build gpu libc on mac hosts. Previously it would fail on several issues, starting with an unused argument -mmacos-version-min error, followed by other errors caused by passing -isysroot. Secondarily, restrict the cmake imported targets when cross compiling. Without this, the amdgpu build prints many cmake warnings about the target not supporting shared libraries. Claude did most of the actual work, though it required quite a few rounds of prodding to get it into the right place. In particular it took care of handling all of the cmake platform recognized names from the triple. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
36 lines
1.4 KiB
CMake
36 lines
1.4 KiB
CMake
#===--------------------------------------------------------------------===//
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#
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for details.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#
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#===--------------------------------------------------------------------===//
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# Normalize a target triple using clang's -print-target-triple.
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#
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# Usage:
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# normalize_triple(<compiler> <triple> <out_var>)
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#
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# Runs <compiler> --target=<triple> -print-target-triple to produce a
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# canonical triple. If the compiler invocation fails (e.g. the compiler
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# is not clang), <triple> is returned unchanged.
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function(normalize_triple compiler triple out_var)
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set(_prefix "")
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if(CMAKE_C_COMPILER_FRONTEND_VARIANT MATCHES "MSVC")
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set(_prefix "/clang:")
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endif()
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execute_process(
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COMMAND "${compiler}" "${_prefix}--target=${triple}" "${_prefix}-print-target-triple"
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RESULT_VARIABLE _result
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OUTPUT_VARIABLE _output
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OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_QUIET)
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if(_result EQUAL 0 AND _output)
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set(${out_var} "${_output}" PARENT_SCOPE)
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else()
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# TODO(#97876): Report an error.
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message(WARNING "Failed to execute `${compiler} ${_prefix}--target=${triple} ${_prefix}-print-target-triple` to normalize target triple.")
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set(${out_var} "${triple}" PARENT_SCOPE)
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endif()
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endfunction()
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