Fix ptrauth C++ module include issue between extern

[Kyle-Ye]

Fix “error: import of C++ module 'ptrauth' appears within extern "C" language linkage specification”

LLVM upstream makes ptrauth a module on this commit swiftlang/llvm-project@0481f04.

Swift 6.1 release introduced such change into the toolchain.

Close #5211

[Kyle-Ye]

@swift-ci please test

[parkera]

Change looks ok, but why did the Linux build fail?

[Kyle-Ye]

Failed Tests (1):
swift-package-tests :: test-foundation-package/test-foundation-networking-static-stdlib.test
...
[2025-05-11T11:57:03.604Z] FAIL: swift-package-tests :: test-foundation-package/test-foundation-networking-static-stdlib.test (27 of 39)
[2025-05-11T11:57:03.604Z] ******************** TEST 'swift-package-tests :: test-foundation-package/test-foundation-networking-static-stdlib.test' FAILED ********************
[2025-05-11T11:57:03.604Z] Exit Code: 2
[2025-05-11T11:57:03.604Z] 
[2025-05-11T11:57:03.604Z] Command Output (stdout):
[2025-05-11T11:57:03.604Z] --
[2025-05-11T11:57:03.604Z] # RUN: at line 2
[2025-05-11T11:57:03.604Z] rm -rf /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/tests/test-foundation-package/Output/test-foundation-networking-static-stdlib.test.tmp
[2025-05-11T11:57:03.604Z] # executed command: rm -rf /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/tests/test-foundation-package/Output/test-foundation-networking-static-stdlib.test.tmp
[2025-05-11T11:57:03.604Z] # note: command had no output on stdout or stderr
[2025-05-11T11:57:03.604Z] # RUN: at line 3
[2025-05-11T11:57:03.604Z] mkdir -p /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/tests/test-foundation-package/Output/test-foundation-networking-static-stdlib.test.tmp
[2025-05-11T11:57:03.604Z] # executed command: mkdir -p /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/tests/test-foundation-package/Output/test-foundation-networking-static-stdlib.test.tmp
[2025-05-11T11:57:03.604Z] # note: command had no output on stdout or stderr
[2025-05-11T11:57:03.604Z] # RUN: at line 4
[2025-05-11T11:57:03.604Z] /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/usr/bin/swiftc -static-stdlib /home/build-user/swift-integration-tests/test-foundation-package/test-foundation-networking.swift -o /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/tests/test-foundation-package/Output/test-foundation-networking-static-stdlib.test.tmp/test-foundation-networking
[2025-05-11T11:57:03.604Z] # executed command: /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/usr/bin/swiftc -static-stdlib /home/build-user/swift-integration-tests/test-foundation-package/test-foundation-networking.swift -o /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/tests/test-foundation-package/Output/test-foundation-networking-static-stdlib.test.tmp/test-foundation-networking
[2025-05-11T11:57:03.604Z] # .---command stderr------------
[2025-05-11T11:57:03.604Z] # | /home/build-user/swift-foundation/Sources/FoundationEssentials/Data/Data+Writing.swift:178: warning: the use of `mktemp' is dangerous, better use `mkstemp' or `mkdtemp'
[2025-05-11T11:57:03.604Z] # `-----------------------------
[2025-05-11T11:57:03.604Z] # RUN: at line 5
[2025-05-11T11:57:03.604Z] /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/tests/test-foundation-package/Output/test-foundation-networking-static-stdlib.test.tmp/test-foundation-networking | /home/build-user/build/buildbot_linux/llvm-linux-x86_64/bin/FileCheck /home/build-user/swift-integration-tests/test-foundation-package/test-foundation-networking-static-stdlib.test
[2025-05-11T11:57:03.604Z] # executed command: /home/build-user/build/buildbot_linux/none-swift_package_sandbox_linux-x86_64/tests/test-foundation-package/Output/test-foundation-networking-static-stdlib.test.tmp/test-foundation-networking
[2025-05-11T11:57:03.604Z] # .---command stderr------------
[2025-05-11T11:57:03.604Z] # | generic witness table at 0x55b011c7d058 contains out-of-bounds requirement descriptor 0x11
[2025-05-11T11:57:03.604Z] # `-----------------------------
[2025-05-11T11:57:03.604Z] # error: command failed with exit status: -6
[2025-05-11T11:57:03.604Z] # executed command: /home/build-user/build/buildbot_linux/llvm-linux-x86_64/bin/FileCheck /home/build-user/swift-integration-tests/test-foundation-package/test-foundation-networking-static-stdlib.test
[2025-05-11T11:57:03.604Z] # .---command stderr------------
[2025-05-11T11:57:03.604Z] # | FileCheck error: '<stdin>' is empty.
[2025-05-11T11:57:03.604Z] # | FileCheck command line:  /home/build-user/build/buildbot_linux/llvm-linux-x86_64/bin/FileCheck /home/build-user/swift-integration-tests/test-foundation-package/test-foundation-networking-static-stdlib.test
[2025-05-11T11:57:03.604Z] # `-----------------------------
[2025-05-11T11:57:03.604Z] # error: command failed with exit status: 2

It looks the CI is emitting an error of generic witness table at 0x55b011c7d058 contains out-of-bounds requirement descriptor 0x11 when running this test case with test-foundation-networking-static-stdlib.test

https://github.com/swiftlang/swift-integration-tests/blob/main/test-foundation-package/test-foundation-networking.swift

https://github.com/swiftlang/swift-integration-tests/blob/main/test-foundation-package/test-foundation-networking-static-stdlib.test

Let's rerun the CI again. And if the error still occur, I'll try to reproduce it locally or ask help from the test case author @kateinoigakukun.

[Kyle-Ye]

@swift-ci please test linux

[Kyle-Ye]

#5207 's Linux test also fail for the same failure reason.

I highly suspect this is a upstream issue. And it is not related with this PR or #5207.

Do you know who is responsible for fixing this CI issue? @parkera