282276 2024-10-29 13:31:24 -0700 [Win] Cross-compiling the Windows port from Linux 2026-03-11 08:40:50 -0700 1 1 1 Unclassified WebKit CMake WebKit Nightly Build PC Unspecified RESOLVED FIXED InRadar P2 Normal --- 309681 1 ian.grunert webkit-unassigned fujii jay.bhaskar webkit-bug-importer oldest_to_newest 2071365 0 ian.grunert 2024-10-29 13:31:24 -0700 It would make it easier for more WebKit maintainers to fix Windows build issues. It's more likely that contributors have a Linux dev environment setup than a Windows one. Windows compiles under clang-cl now, and links with lld-link, so no MASM.exe to worry about. We'll need something like https://github.com/Jake-Shadle/xwin to download the Microsoft CRT headers and libraries, and Windows SDK headers and libraries - we might want to integrate it into the existing script that downloads WebKitRequirements and put the files in WebKitLibraries. Use the /vctoolsdir and /winsdkdir flags for clang-cl to point at the CRT and SDK directories, which should expand out into the required compilation / linker flags. Some CMake changes will be needed to duct tape these pieces together - in particular the /vctoolsdir and /winsdkdir flags. Might require some changes to Scripts like build-webkit etc. ---- Running the MiniBrowser / jsc via wine might need other changes, but being able to build would be the first step. 2071471 1 fujii 2024-10-29 17:09:22 -0700 glandium.org » Blog Archive » Standing up the Cross-Compilation of Firefox for Windows on Linux https://glandium.org/blog/?p=4020 2072922 2 webkit-bug-importer 2024-11-05 12:32:15 -0800 <rdar://problem/139306427> 2170044 3 ian.grunert 2026-01-07 11:32:30 -0800 We'd have to switch vcpkg to compile it's dependencies using clang-cl as well. Building icu with clang-cl seems to fail: ``` [554/556] C:\WINDOWS\system32\cmd.exe /C "cd /D S:\WebKit\WebKitBuild\Debug\vcpkg_installed\vcpkg\blds\icu\x64-windows-webkit-dbg && S:\WebKit\WebKitBuild\Debug\vcpkg_installed\vcpkg\blds\icu\x64-windows-webkit-dbg\bin\pkgdata -f -v -c -s S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/build/icudt77l -d S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out -e icudt77 -T S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/tmp -p icudt77l -m dll -L icudt S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/tmp/icudata.lst && "C:\Program Files\CMake\bin\cmake.exe" -E touch S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/icudata_asm_file_stamp" FAILED: data/out/tmp/icudt77l_dat.obj data/out/icudata_asm_file_stamp S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/tmp/icudt77l_dat.obj S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/icudata_asm_file_stamp C:\WINDOWS\system32\cmd.exe /C "cd /D S:\WebKit\WebKitBuild\Debug\vcpkg_installed\vcpkg\blds\icu\x64-windows-webkit-dbg && S:\WebKit\WebKitBuild\Debug\vcpkg_installed\vcpkg\blds\icu\x64-windows-webkit-dbg\bin\pkgdata -f -v -c -s S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/build/icudt77l -d S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out -e icudt77 -T S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/tmp -p icudt77l -m dll -L icudt S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/tmp/icudata.lst && "C:\Program Files\CMake\bin\cmake.exe" -E touch S:/WebKit/WebKitBuild/Debug/vcpkg_installed/vcpkg/blds/icu/x64-windows-webkit-dbg/data/out/icudata_asm_file_stamp" ninja: build stopped: subcommand failed. ``` Might work after icu is updated past 78.1: https://unicode-org.atlassian.net/browse/ICU-23151 2171534 4 ian.grunert 2026-01-13 13:16:48 -0800 https://github.com/mstorsjo/msvc-wine This might be able to run MSVC on Linux via wine to solve the vcpkg problem (as well as solving the problem of downloading the required headers and libraries) 2180407 5 ian.grunert 2026-02-11 12:15:31 -0800 Pull request: https://github.com/WebKit/WebKit/pull/57907 2188808 6 ews-feeder 2026-03-10 13:08:18 -0700 Committed 309008@main (da4f01ed87f0): <https://commits.webkit.org/309008@main> Reviewed commits have been landed. Closing PR #57907 and removing active labels.