Add test runner option --log-test-environment, which will introspect and print detailed information about Emscripten tool setup: Emcc, Clang, Binaryen, Node, Python and LLVM. This helps CI maintainers emit info to test run logs of the active setup for reference. `test/runner --log-test-environment <tests_to_run>` will then print a following log info dump before starting the tests: ``` C:\emsdk\emscripten\main>test\runner --log-test-environment ======================== Test Setup ======================== Test time: Thursday, November 20, 2025 22:28:18 UTC Python: "C:\emsdk\python\3.13.3_64bit\python.exe". Version: 3.13.3 (tags/v3.13.3:6280bb5, Apr 8 2025, 14:47:33) [MSC v.1943 64 bit (AMD64)] Emscripten test runner path: "C:\emsdk\emscripten\main\test\runner.py" Emscripten repository: "C:\emsdk\emscripten\main" emscripten-version.txt: 4.0.21-git Emscripten commit cce3a70 Author: Jukka Jylänki <jujjyl@gmail.com> Date: Fri Nov 21 00:26:51 2025 +0200 Add test runner option --log-test-environment, which will introspect and print detailed information about Emscripten tool setup: Emcc, Clang, Binaryen, Node, Python and LLVM. This helps CI maintainers emit info to test run logs of the active setup for reference. EM_CONFIG: "C:\emsdk\.emscripten" import os emsdk_path = os.path.dirname(os.getenv('EM_CONFIG')).replace('\\', '/') LLVM_ROOT = emsdk_path + '/llvm/git/build_main_vs2022_64/Release/bin' NODE_JS = emsdk_path + '/node/22.16.0_64bit/bin/node.exe' EMSDK_CMAKE = emsdk_path + '/cmake/4.2.0-rc3_64bit/bin/cmake.exe' PYTHON = emsdk_path + '/python/3.13.3_64bit/python.exe' EMSCRIPTEN_ROOT = emsdk_path + '/emscripten/main' BINARYEN_ROOT = emsdk_path + '/binaryen/main_vs2022_64bit_binaryen' MINGW_ROOT = emsdk_path + '/mingw/7.1.0_64bit' NINJA = emsdk_path + '/ninja/git-release_64bit/bin' EMSDK_ACTIVATED_TEST_BROWSER = emsdk_path + '/firefox/78.15.0esr_64bit/firefox.exe' NODE_JS: ['C:/emsdk/node/22.16.0_64bit/bin/node.exe']. Version: v22.16.0 BINARYEN_ROOT: C:/emsdk/binaryen/main_vs2022_64bit_binaryen wasm-opt version: wasm-opt version 124 (version_124-122-g8a66d2a7d) Binaryen git directory: "C:\emsdk\binaryen\main" Binaryen commit 8a66d2a7d48a0014dce5e22a2fa8eee12eb09b7c Author: Alon Zakai <azakai@google.com> Date: Thu Nov 6 11:53:49 2025 -0800 GUFA: Represent imported functions as globals (#8025) The meaning of Global in PossibleContents changes from "an actual wasm Global" to "an immutable global wasm thing, either a Global or a Function." Imported wasm Functions are effectively immutable values in the global scope - not concrete, specifically-known functions - so this is more correct. In particular, two imported Globals (of compatible types) might or might not be the same, and likewise with imported Functions. And that is not the case for defined Functions - they are definitely different. This does not fix the issues related to imported function type handling - #7993 does that - but this refactoring makes it possible to properly optimize imported functions afterward. This does make the PossibleContents object grow from 32 to 40 bytes, which might be why this adds 3-4% overhead to GUFA, but I don't see a good way to avoid that, unfortunately. Keeping our ability to optimize imported functions might be worth that 3-4% (we recently saw a few digits improvement due to properly optimizing imported externs, for example, from #8005). LLVM_ROOT: C:/emsdk/llvm/git/build_main_vs2022_64/Release/bin LLVM git directory: "C:/emsdk/llvm/git\src" LLVM commit d65be16ab6adf00af21e75d29049ae5de0f3a38a Author: Ryan Cowan <ryan.cowan@arm.com> Date: Mon Nov 17 15:55:40 2025 +0000 [AArch64][GlobalISel] Add combine for build_vector(unmerge, unmerge, undef, undef) (#165539) This PR adds a new combine to the `post-legalizer-combiner` pass. The new combine checks for vectors being unmerged and subsequently padded with `G_IMPLICIT_DEF` values by building a new vector. If such a case is found, the vector being unmerged is instead just concatenated with a `G_IMPLICIT_DEF` that is as wide as the vector being unmerged. This removes unnecessary `mov` instructions in a few places. Clang: "C:/emsdk/llvm/git/build_main_vs2022_64/Release/bin\clang.exe" clang version 22.0.0git (https://github.com/llvm/llvm-project.git d65be16ab6adf00af21e75d29049ae5de0f3a38a) Target: x86_64-pc-windows-msvc Thread model: posix InstalledDir: C:\emsdk\llvm\git\build_main_vs2022_64\Release\bin EMTEST_BROWSER: "C:\\emsdk\\firefox\\78.15.0esr_64bit\\firefox.exe" -new-instance -wait-for-browser Firefox version: 78 Not detected as a Safari browser EMSDK: "C:/emsdk" Emsdk commit fe91d96cfd53f505a2ce561b01320124bff438a1 Author: Jukka Jylänki <jujjyl@gmail.com> Date: Mon Nov 17 18:41:28 2025 +0200 Use exit_with_error ==================== End of Test Setup ===================== ```

unable to build zmq for emscripten c #8005

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