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[CMake] Use Clang to infer the target triple (#89425)

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When using Clang as a compiler, use Clang to normalize the triple that's
used to construct path for runtime library build and install paths. This
ensures that paths are consistent and avoids the issue where the build
uses a different triple spelling.

Differential Revision: https://reviews.llvm.org/D140925
This commit is contained in:
Petr Hosek
2024-07-05 22:56:15 -07:00
committed by GitHub
parent ccf357ff64
commit 9cb9a97e44
3 changed files with 33 additions and 5 deletions
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19
runtimes/CMakeLists.txt
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@@ -183,6 +183,25 @@ message(STATUS "LLVM default target triple: ${LLVM_DEFAULT_TARGET_TRIPLE}")
set(LLVM_TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}")
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
set(option_prefix "")
if (CMAKE_C_SIMULATE_ID MATCHES "MSVC")
set(option_prefix "/clang:")
endif()
set(print_target_triple ${CMAKE_C_COMPILER} ${option_prefix}--target=${LLVM_DEFAULT_TARGET_TRIPLE} ${option_prefix}-print-target-triple)
execute_process(COMMAND ${print_target_triple}
RESULT_VARIABLE result
OUTPUT_VARIABLE output
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(result EQUAL 0)
set(LLVM_DEFAULT_TARGET_TRIPLE ${output})
else()
string(REPLACE ";" " " print_target_triple "${print_target_triple}")
# TODO(#97876): Report an error.
message(WARNING "Failed to execute `${print_target_triple}` to normalize target triple.")
endif()
endif()
option(LLVM_INCLUDE_TESTS "Generate build targets for the runtimes unit tests." ON)
option(LLVM_INCLUDE_DOCS "Generate build targets for the runtimes documentation." ON)
option(LLVM_ENABLE_SPHINX "Use Sphinx to generate the runtimes documentation." OFF)