[all-commits] [llvm/llvm-project] 9c865c: [lld][WebAssembly] Implement --why-extract flag fr...

[Sam Clegg via All-commits]

  Branch: refs/heads/release/16.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 9c865c230791b111f3df550288ac4f2dc7cb1c51
      https://github.com/llvm/llvm-project/commit/9c865c230791b111f3df550288ac4f2dc7cb1c51
  Author: Sam Clegg <sbc at chromium.org>
  Date:   2023-06-01 (Thu, 01 Jun 2023)

  Changed paths:
    A lld/test/wasm/why-extract.s
    M lld/wasm/Config.h
    M lld/wasm/Driver.cpp
    M lld/wasm/Options.td
    M lld/wasm/SymbolTable.cpp

  Log Message:
  -----------
  [lld][WebAssembly] Implement --why-extract flag from the ELF backend

See https://reviews.llvm.org/D109572 for the original ELF version.

Differential Revision: https://reviews.llvm.org/D145431

(cherry picked from commit 8aef04fa69a2a78fecdbc4d57174d773a7e5f2df)


  Commit: 74b5a0af52eb5681d7897d161e0984dbf7b18702
      https://github.com/llvm/llvm-project/commit/74b5a0af52eb5681d7897d161e0984dbf7b18702
  Author: Sam Clegg <sbc at chromium.org>
  Date:   2023-06-01 (Thu, 01 Jun 2023)

  Changed paths:
    M lld/docs/WebAssembly.rst
    A lld/test/wasm/Inputs/libstub-missing-dep.so
    A lld/test/wasm/Inputs/libstub-missing-sym.so
    A lld/test/wasm/Inputs/libstub.so
    A lld/test/wasm/stub_library.s
    M lld/wasm/Driver.cpp
    M lld/wasm/InputFiles.cpp
    M lld/wasm/InputFiles.h
    M lld/wasm/Relocations.cpp
    M lld/wasm/SymbolTable.cpp
    M lld/wasm/SymbolTable.h
    M lld/wasm/Symbols.cpp
    M lld/wasm/Symbols.h
    M lld/wasm/Writer.cpp

  Log Message:
  -----------
  [lld][WebAssembly] Initial support for stub libraries

See the docs in lld/docs/WebAssembly.rst for more on this.

This feature unlocks a lot of simplification in the emscripten toolchain
since we can represent the JS libraries to wasm-ld as stub libraries.

See https://github.com/emscripten-core/emscripten/issues/18875

Differential Revision: https://reviews.llvm.org/D145308

(cherry picked from commit 3111784ff7d3d51a9e981b1a0bbc8f6511c34d25)


Compare: https://github.com/llvm/llvm-project/compare/ad815b672d22...74b5a0af52eb