Tested on 5.9.2 release and 5.11 trunk development.
The compiler gets hung when compiling the macro target in release mode. Debug works just fine and results in a working binary.
Last output of the compiler:
ntax.build\SyntaxDeclNodes.swift.o -o F:\Projects\Kyanite\.build\x86_64-unknown-windows-msvc\release\SwiftSyntax.build\SyntaxExprNodes.swift.o -o F:\Projects\Kyanite\.build\x86_64-unknown-windows-msvc\release\SwiftSyntax.build\SyntaxNodes.swift.o -o F:\Projects\Kyanite\.build\x86_64-unknown-windows-msvc\release\SwiftSyntax.build\SyntaxPatternNodes.swift.o -o F:\Projects\Kyanite\.build\x86_64-unknown-windows-msvc\release\SwiftSyntax.build\SyntaxStmtNodes.swift.o -o F:\Projects\Kyanite\.build\x86_64-unknown-windows-msvc\release\SwiftSyntax.build\SyntaxTypeNodes.swift.o
SyntaxTypeNodes.swift.o is where both compiler versions are stuck so the issue seems to be reproducible.
Macro target:
.macro(
name: "Macros",
dependencies: [
.product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
.product(name: "SwiftCompilerPlugin", package: "swift-syntax")
],
path: "scripting/macros"
),
Note:
The macro target build fails even when the source files are empty, so the issue does seem to be SwiftSyntax itself.
Edit:
Even the example macro target created via swift package init --type=macro
fails