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@ -137,11 +137,29 @@ add_custom_target(compiler-rt DEPENDS compiler-rt-build compiler-rt-post-build)
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# =============================================================================
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function(define_wasi_libc_sub target target_suffix lto)
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set(build_dir ${CMAKE_CURRENT_BINARY_DIR}/wasi-libc-${target}${target_suffix})
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string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UPPER)
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get_property(directory_cflags DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY COMPILE_OPTIONS)
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set(extra_cflags_list "${WASI_SDK_CPU_CFLAGS} ${CMAKE_C_FLAGS} ${directory_cflags}")
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list(APPEND directory_cflags -resource-dir ${wasi_resource_dir})
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set(extra_cflags_list
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"${WASI_SDK_CPU_CFLAGS} ${CMAKE_C_FLAGS} ${directory_cflags} ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UPPER}}")
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set(extra_make_flags default)
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# If LTO is enabled then pass that on to wasi-libc, and otherwise make sure to
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# build a `libc.so` dynamic library where possible (not compatible with
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# threads though)
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if(lto)
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list(APPEND extra_make_flags LTO=full)
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elseif(NOT ${target} MATCHES threads)
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list(APPEND extra_make_flags libc_so)
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endif()
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if(${target} MATCHES p2)
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if(${target} MATCHES threads)
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list(APPEND extra_make_flags THREAD_MODEL=posix)
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elseif(${target} MATCHES p2)
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list(APPEND extra_make_flags WASI_SNAPSHOT=p2)
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# Always enable `-fPIC` for the `wasm32-wasip2` target. This makes `libc.a`
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# more flexible and usable in dynamic linking situations.
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list(APPEND extra_cflags_list -fPIC)
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@ -155,26 +173,25 @@ function(define_wasi_libc_sub target target_suffix lto)
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set(libcompiler_rt_a ${wasi_resource_dir}/lib/wasm32-unknown-wasip1/libclang_rt.builtins.a)
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endif()
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set(extra_cmake_args)
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# Configure LTO in wasi libc if it's enabled. Be sure to disable shared
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# libraries as well since that's not currently supported.
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if (lto)
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list(APPEND extra_cmake_args -DLTO=full -DBUILD_SHARED=OFF)
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endif()
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ExternalProject_Add(wasi-libc-${target}${target_suffix}-build
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SOURCE_DIR ${wasi_libc}
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CMAKE_ARGS
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${default_cmake_args}
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${extra_cmake_args}
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-DTARGET_TRIPLE=${target}
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-DCMAKE_INSTALL_PREFIX=${wasi_sysroot}
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-DCMAKE_C_FLAGS=${extra_cflags}
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-DBUILTINS_LIB=${libcompiler_rt_a}
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-DUSE_WASM_COMPONENT_LD=OFF
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-DBINDINGS_TARGET=OFF
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-DWASI_SDK_VERSION=${wasi_sdk_version}
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# Currently wasi-libc doesn't support out-of-tree builds so feign a
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# "download command" which copies the source tree to a different location
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# so out-of-tree builds are supported.
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DOWNLOAD_COMMAND
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${CMAKE_COMMAND} -E copy_directory ${wasi_libc} ${build_dir}
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SOURCE_DIR "${build_dir}"
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CONFIGURE_COMMAND ""
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BUILD_COMMAND
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${MAKE} -j8 -C ${build_dir}
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CC=${CMAKE_C_COMPILER}
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AR=${CMAKE_AR}
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NM=${CMAKE_NM}
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SYSROOT=${wasi_sysroot}
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EXTRA_CFLAGS=${extra_cflags}
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TARGET_TRIPLE=${target}
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BUILTINS_LIB=${libcompiler_rt_a}
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${extra_make_flags}
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INSTALL_COMMAND ""
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DEPENDS compiler-rt
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EXCLUDE_FROM_ALL ON
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USES_TERMINAL_CONFIGURE ON
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