おそらく C++ Interop を使ったらこれを踏んでLinuxでビルドできなくなった https://github.com/swiftlang/swift-corelibs-foundation/issues/5125

__CFAllocatorRespectsHintZeroWhenAllocating not consistently declar...

when ForFoundationOnly.h and ForSwiftFoundationOnly.h end up being imported, compile fails due to different linkage of __CFAllocatorRespectsHintZeroWhenAllocating(). suggest removing it from ForFou...

4:30 AM

https://github.com/swiftlang/swift-corelibs-foundation/pull/5127

Move __CFAllocatorRespectsHintZeroWhenAllocating (6.0) by parkera ·...

Move __CFAllocatorRespectsHintZeroWhenAllocating to a CF-internal header to avoid confusion over its linkage. Resolves #5125 (cherry picked from #5126 for 6.x). (cherry picked from commit b1b4603)

4:30 AM

6.0.xで直ったのかな