swift: fix darwin build (#485174)

        inherit (builtins) storeDir;

      }

    }

    patch -p1 -d swift -i ${./patches/swift-Frontend-Fix-a-small-unique_ptr-array-access.patch}

    # This patch needs to know the lib output location, so must be substituted

    # in the same derivation as the compiler.

From 1a2293c7593e4eeb3fbad74fa8d362abafb43b56 Mon Sep 17 00:00:00 2001

From: Tony Allevato <allevato@google.com>

Date: Wed, 9 Oct 2024 13:54:43 -0400

Subject: [PATCH] [Frontend] Fix a small `unique_ptr` array access.

When the size of the array accessed here is zero, retrieving the

address of the zero-th element here is undefined. When the frontend

is linked against a libc++ that has the `unique_ptr` hardening in

[this commit](https://github.com/llvm/llvm-project/commit/18df9d23ea390eaa50b41f3083a42f700a2b0e39)

enabled, it traps here.

Instead, simply call `.get()` to retrieve the address of the

array, which works even when it is a zero-byte allocation.

(cherry picked from commit bdf40184ab40eb59642cd825781d71d0711493eb)

---

 lib/FrontendTool/FrontendTool.cpp | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/FrontendTool/FrontendTool.cpp b/lib/FrontendTool/FrontendTool.cpp

index afbc57cdf2f..ba64a306494 100644

--- a/lib/FrontendTool/FrontendTool.cpp

+++ b/lib/FrontendTool/FrontendTool.cpp

@@ -2202,7 +2202,7 @@ int swift::performFrontend(ArrayRef<const char *> Args,

       std::make_unique<llvm::Optional<PrettyStackTraceFileContents>[]>(

           configurationFileBuffers.size());

   for_each(configurationFileBuffers.begin(), configurationFileBuffers.end(),

-           &configurationFileStackTraces[0],

+           configurationFileStackTraces.get(),

            [](const std::unique_ptr<llvm::MemoryBuffer> &buffer,

               llvm::Optional<PrettyStackTraceFileContents> &trace) {

              trace.emplace(*buffer);

-- 

2.52.0