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Dan Gohman 2cd26ead40 Update how wasi-sdk uses cmake (#161) ... * Update how wasi-sdk uses cmake Change `CMAKE_SYSTEM_NAME` to `WASI`, use a `CMAKE_MODULE_PATH`, remove `CACHE` usage, and fix the compiler autodetection code so that the "compiler works" hacks are no longer needed, following the advice in [this comment](https://gitlab.kitware.com/cmake/cmake/-/issues/19223#note_567327). This is hopefully a step towards re-submitting WASI support to upstream cmake. * Add --sysroot to compiler-rt's C flags. This ensures that it finds the built sysroot when testing whether the C compiler works. * Fixes. * Use the just-built ar rather than the host ar. * Use -DCMAKE_C_COMPILER_WORKS=ON instead of stubbing out archive files. * Use -DCMAKE_CXX_COMPILER_WORKS=ON too. * Restore the `--sysroot` argument when building compiler-rt. compiler-rt depends on some libc headers, so it needs a sysroot. * Add sysroot arguments for libc++ and libc++abi too. * Also set CMAKE_AR. It appears with the removal of the AR checks cmake is no longer autodetecting CMAKE_AR, so set it explicitly.		4 years ago
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WASI.cmake	Update how wasi-sdk uses cmake (#161)	4 years ago