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No warning is fixed here. Every one we currently emit is harvested and switched off one by one, and /WX goes on top, so both toolchains build quiet and any *new* warning fails the build instead of scrolling past. cmake/Warnings.cmake carries two independent lists, one per compiler, one line per warning with its occurrence count. Deleting a single line is the unit of work from here on: drop the line, fix the fallout in both compilers, commit. The build stays honest in the meantime. Picking a level had to come first. CMake stopped injecting /W3 of its own accord (policy CMP0092), which had quietly left MSVC on the /W1 default and hid nearly everything; at /W4 it reports 89361 warnings across 31 codes. clang-cl is pinned to /W3 -- clang's own -Wall, and already broader than MSVC /W4 -- for 55 more. The two lists are not comparable by length. Counts cover all four applications, since the #ifdef forest means each one compiles different code. The file is included after the ext/ subdirectories so that add_compile_options' directory scope leaves vendored code on its default flags; ext/ still warns, deliberately, and /WX does not reach it. The existing /wd4838 moves here with the rest. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>