Linux debug builds fail to build (pure bridging mode)

[rjmansfield]

Description

Building the debug variant on Linux will result in failure. If you work around #74659, the next issue encountered is:

/home/ryan_mansfield/swift/swift/SwiftCompilerSources/Sources/Basic/Utils.swift:57:44: error: cannot find 'stderr' in scope
public var standardError = CFileStream(fp: stderr)
                                           ^~~~~~
/home/ryan_mansfield/swift/swift/SwiftCompilerSources/Sources/Basic/Utils.swift:62:55: error: cannot find type 'FILE' in scope
  public typealias FILEPointer = UnsafeMutablePointer<FILE>
                                                      ^~~~
/home/ryan_mansfield/swift/swift/SwiftCompilerSources/Sources/Basic/Utils.swift:69:5: error: cannot find 'fputs' in scope
    fputs(string, fp)
    ^~~~~
/home/ryan_mansfield/swift/swift/SwiftCompilerSources/Sources/Basic/Utils.swift:73:5: error: cannot find 'fflush' in scope
    fflush(fp)
    ^~~~~~

This is because in Debug mode, BRIDGING_MODE=PURE is enabled and then in PURE_BRIDGING_MODE is defined and as a result in include/swift/Basic/BasicBridging.h USED_IN_CPP_SOURCE is not defined, and stdio.h is not implicitly included.

It appears this worked up until 0c8c985 with removal of the import CxxStdlib
@eeckstein fyi

Reproduction

On linux build without args (default to debug)

utils/build-script

Expected behavior

Successful build

Environment

Ubuntu 22.04

Additional information

No response

[eeckstein]

should be fixed with #74766