LLVM Patches

xclang builds LLVM's release source with the changes in patches/, one directory each: the patch and a README on what it changes, why, how it was checked, and its state upstream. They are applied in the order of the directories right after the source is unpacked, so a tag's workflow, run again, builds the same thing; libclang's manifest lists them (XCLANG_PATCHES in lib/cmake/xclang/libclang.cmake).

patch	what it changes
0001-sema-partial-ordering-depth	partial ordering deduces at the templates' own depth: code completion in a class template no longer crashes clang (clice#701)
0002-completion-unresolved-member-base	member-access completion reports its context when Sema finds no class for the base
0003-completion-context-base-expr	CodeCompletionContext::getBaseExpr, the member base as written
0004-windows-driver-setup-api-mingw	the MinGW-built clang finds Visual Studio 2017 and later through the Setup API, like the MSVC-built one (clice#714)
0006-libcxx-format-buffer-full	std::format_to into a container no longer writes past its 256-code-unit stack buffer after an argument whose length is a multiple of 256
0007-lld-macho-empty-section-unwind	ld64.lld keeps a function's unwind entry when an empty section's symbol shares its address: ThinLTO programs linked by one clang command catch their exceptions on arm64 macOS
0008-preprocessed-raw-string-lines	clang -E writes a raw string literal's CRLF line breaks as \n, what they mean, and counts its lines: its output, compiled (build caches such as xmake's), gives the same strings and line numbers
0009-textapi-arm64e-x1	ld64.lld reads the macOS 27 SDK's .tbd stubs, which list arm64e.x1: macOS programs link against Xcode 27's SDK (release/23.x's backport, in 23.1.3)

0005 (ASan's container checks in libc++'s ODR signature) was in 23.1.2.3 and 23.1.2.4; the ASan libc++ replaced it in 23.1.2.5. CHANGELOG.md has which release took which patch.