kou commented on issue #40248:
URL: https://github.com/apache/arrow/issues/40248#issuecomment-1967927360
Ah, sorry. I should have explained the idea of the suggested patch.
In general, Apache Arrow C++ build uses Apple's C/C++ toolchain. So
`CMAKE_CXX_COMPILER_ID` is `AppleClang`. In this case,
`if(CMAKE_CXX_COMPILER_ID MATCHES "^(Clang|GNU|Intel|IntelLLVM)$")` isn't
matched. `if(APPLE)` (Apple's libtool) is used.
If macOS + CRAN build does NOT use Apple's C/C++ toolchain (uses C/C++
toolchain provided by R.framework that also includes GNU libtool, gcc, g++, GNU
ar and so on), `CMAKE_CXX_COMPILER_ID` may be `GNU` not `AppleClang`. In this
case, `if(CMAKE_CXX_COMPILER_ID MATCHES "^(Clang|GNU|Intel|IntelLLVM)$")` (GNU
ar) is used.
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