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Add a new `emld` linker entry point and delegate linking from `emcc` to `clang` with `-fuse-ld=emld`. Previously, `emcc` acted as both compiler driver and linker driver, manually compiling multiple source inputs to temporary object files in Python before running `tools/link.py`. With this change: 1. `emld` acts as a drop-in linker replacement that wraps `link.run` and invokes `wasm-ld` followed by Emscripten's post-link steps. 2. `emcc` in link mode delegates to `clang -fuse-ld=<path-to-emld>`, allowing `clang` to handle source compilation, temporary files, and calling the linker. 3. Emscripten-specific linker arguments and `-s` settings are forwarded through `clang` to `emld` via `-Wl,` or `-Xlinker`. 4. `tools/link.py` extracts `linker_setup_minimal` so minimal linker settings can be determined before system libraries are calculated in `emcc`. See: emscripten-core#15703
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Add a new
emldlinker entry point and delegate linking fromemcctoclangwith-fuse-ld=emld.Previously,
emccacted as both compiler driver and linker driver, manually compiling multiple source inputs to temporary object files in Python before runningtools/link.py. With this change:emldacts as a drop-in linker replacement that wrapslink.runand invokeswasm-ldfollowed by Emscripten's post-link steps.emccin link mode delegates toclang -fuse-ld=<path-to-emld>, allowingclangto handle source compilation, temporary files, and calling the linker.-ssettings are forwarded throughclangtoemldvia-Wl,or-Xlinker.tools/link.pyextractslinker_setup_minimalso minimal linker settings can be determined before system libraries are calculated inemcc.See: #15703