Merge nucleic/humble-fern-egret-60xo into dev

build.ps1

@@ -16,7 +16,7 @@
       CPATH                 — additive. clang appends it to the header search path without
                               disturbing MSVC/SDK auto-detection, so plain `swift build`
                               works afterwards with no flags at all.
-      -Xlinker -LIBPATH:    — passed per-invocation rather than via %LIB%. Setting %LIB%
+      -Xlinker /LIBPATH:    — passed per-invocation rather than via %LIB%. Setting %LIB%
                               would be actively harmful: clang skips emitting its own
                               -libpath: for the VC, UCRT *and* Windows SDK directories the
                               moment %LIB% is set (clang/lib/Driver/ToolChains/MSVC.cpp,
@@ -167,7 +167,11 @@ function Invoke-Swift([string[]]$SwiftArgs, [hashtable]$Sql) {
     # warning. Read the warnings.
     $full = @($SwiftArgs) + @(
         '-Xcc', "-I$($Sql.Include)",
-        '-Xlinker', "-LIBPATH:$($Sql.Lib)",
+        # `/LIBPATH:`, NOT `-LIBPATH:`. A leading `-L` is claimed by the driver's GNU-style
+        # library-path flag, so `-LIBPATH:C:\…\lib` is read as `-L` + `IBPATH:C:\…\lib` and
+        # re-emitted to the linker as `-libpath:IBPATH:C:\…\lib` — a directory that exists
+        # nowhere, and the only symptom is `lld-link: could not open 'sqlite3.lib'`.
+        '-Xlinker', "/LIBPATH:$($Sql.Lib)",
         '-Xlinker', '/FORCE:MULTIPLE')
     Write-Note "swift $($full -join ' ')"
     # Out-Host, not the pipeline: a native command's stdout would otherwise become this