mirror of
https://github.com/apple/swift.git
synced 2026-10-12 14:50:47 +02:00
Max Desiatov
63a2373ed2
The Emscripten-host frontend and the wasi sysroot/stdlib bake the build machine's absolute source path into `__FILE__`/`#file` literals that ship in the served artifacts. When `TOOLCHAIN_FILE_PREFIX_MAP` is set, thread it through the C/C++/Swift compile flags as `-ffile-prefix-map`/`-file-prefix-map` to rewrite those paths to a neutral prefix. The wiring is a no-op when the variable is unset, so default builds are unchanged.
56 lines
2.7 KiB
CMake
56 lines
2.7 KiB
CMake
# Cross-build `swift-frontend` to run hosted on a WebAssembly (Emscripten)
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# runtime. The Swift half of the wasm-hosted toolchain; LLVM/clang uses
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# EmscriptenHostLLVM.cmake.
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# Consumed by the EmscriptenHostSwift build-script product, which also passes
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# the path-dependent -D flags (LLVM_DIR, Clang_DIR, SDK/sysroot, native tools,
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# and the EmscriptenHostSwiftLLDShim.cmake top-level include).
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#
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# These `set(... CACHE ...)` entries are no-FORCE: they apply only on a fresh
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# build dir, not an existing one (even with --reconfigure). Remove the build
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# dir and reconfigure after editing this file.
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# BOOTSTRAPPING_MODE is BOOTSTRAPPING, but the product also passes
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# SWIFT_NATIVE_SWIFT_TOOLS_PATH (a prebuilt native swiftc), which flips the
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# effective mode to CROSSCOMPILE: that swiftc compiles SwiftCompilerSources
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# instead of in-tree bootstrapping stages.
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set(SWIFT_ENABLE_SWIFT_IN_SWIFT ON CACHE BOOL "")
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set(SWIFT_BUILD_SWIFT_SYNTAX OFF CACHE BOOL "")
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set(BOOTSTRAPPING_MODE "BOOTSTRAPPING" CACHE STRING "")
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set(SWIFT_HOST_VARIANT_SDK "EMSCRIPTEN" CACHE STRING "")
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set(SWIFT_HOST_VARIANT_ARCH "wasm32" CACHE STRING "")
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# No immediate (JIT) mode on the wasm host.
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set(SWIFT_INCLUDE_TOOLS ON CACHE BOOL "")
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set(SWIFT_BUILD_IMMEDIATE_MODE OFF CACHE BOOL "")
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# Auxiliary tool libraries not run on the wasm host.
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set(SWIFT_TOOL_LIBSWIFTSCAN_BUILD OFF CACHE BOOL "")
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set(SWIFT_TOOL_LIBSTATICMIRROR_BUILD OFF CACHE BOOL "")
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set(SWIFT_TOOL_LIBMOCKPLUGIN_BUILD OFF CACHE BOOL "")
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# The stdlib, overlays, and SourceKit are prebuilt inputs; this build produces
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# the frontend, not the runtime.
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set(SWIFT_BUILD_DYNAMIC_STDLIB OFF CACHE BOOL "")
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set(SWIFT_BUILD_STATIC_STDLIB OFF CACHE BOOL "")
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set(SWIFT_BUILD_REMOTE_MIRROR OFF CACHE BOOL "")
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set(SWIFT_BUILD_SOURCEKIT OFF CACHE BOOL "")
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set(SWIFT_BUILD_CLANG_OVERLAYS OFF CACHE BOOL "")
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set(SWIFT_BUILD_DYNAMIC_SDK_OVERLAY OFF CACHE BOOL "")
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set(SWIFT_INCLUDE_TESTS OFF CACHE BOOL "")
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set(SWIFT_INCLUDE_DOCS OFF CACHE BOOL "")
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# Emscripten link flags: grow memory up to 4 GiB (wasm32 max), access the host
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# filesystem directly (NODERAWFS), and emit DWARF into a sidecar so the main
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# module stays under the wasm engine's per-module size limit.
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set(CMAKE_EXE_LINKER_FLAGS
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"-sALLOW_MEMORY_GROWTH=1 -sMAXIMUM_MEMORY=4294967296 -sSTACK_SIZE=8388608 -sINITIAL_MEMORY=134217728 -sNODERAWFS=1 -sENVIRONMENT=node -gseparate-dwarf"
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CACHE STRING "")
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# Keep the build machine's path out of __FILE__ literals baked into the served frontend.
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if(DEFINED ENV{TOOLCHAIN_FILE_PREFIX_MAP})
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -ffile-prefix-map=$ENV{TOOLCHAIN_FILE_PREFIX_MAP}" CACHE STRING "")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ffile-prefix-map=$ENV{TOOLCHAIN_FILE_PREFIX_MAP}" CACHE STRING "")
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endif()
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