error: link command failed with exit code 1 (use -v to see invocation)
wasm-ld: error: /__w/swift-syntax/swift-syntax/.build/wasm32-unknown-wasi/release/_SwiftSyntaxCShims.build/PlatformMutex.c.o: undefined symbol: pthread_mutex_init
wasm-ld: error: /__w/swift-syntax/swift-syntax/.build/wasm32-unknown-wasi/release/_SwiftSyntaxCShims.build/PlatformMutex.c.o: undefined symbol: pthread_mutex_lock
wasm-ld: error: /__w/swift-syntax/swift-syntax/.build/wasm32-unknown-wasi/release/_SwiftSyntaxCShims.build/PlatformMutex.c.o: undefined symbol: pthread_mutex_unlock
wasm-ld: error: /__w/swift-syntax/swift-syntax/.build/wasm32-unknown-wasi/release/_SwiftSyntaxCShims.build/PlatformMutex.c.o: undefined symbol: pthread_mutex_destroy

Does this mean pthread.h does exist, but it actually don't have the library? That doesn't sound ideal.
But anyway, pthread is only used here https://github.com/swiftlang/swift-syntax/blob/main/Sources/_SwiftSyntaxCShims/PlatformMutex.c

If the target is not a multi-thread environment, feel free to add something like

#elif <CONDITION>
PlatformMutex swiftsyntax_platform_mutex_create() {
  PlatformMutex m;
  m.opaque = 0;
  return m;
}
void swiftsyntax_platform_mutex_lock(PlatformMutex m) {}
void swiftsyntax_platform_mutex_unlock(PlatformMutex m) {}
void swiftsyntax_platform_mutex_destroy(PlatformMutex m) {}

(before #elif __has_include(<pthread.h>))

Since I personally don't know the preprocessor macro for WASI, contribution is appreciated.

Can't build #145

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