From e4ab7ca031a28c4375865150963b554705fad4ec Mon Sep 17 00:00:00 2001
From: Jeremy Schonfeld <jschonfeld@apple.com>
Date: Tue, 3 Sep 2024 14:58:22 -0700
Subject: [PATCH] Set SWIFT_SYSTEM_NAME for macro project in CMake (#896)

---
 Sources/FoundationMacros/CMakeLists.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Sources/FoundationMacros/CMakeLists.txt b/Sources/FoundationMacros/CMakeLists.txt
index 97104767c..7746d7bd6 100644
--- a/Sources/FoundationMacros/CMakeLists.txt
+++ b/Sources/FoundationMacros/CMakeLists.txt
@@ -26,6 +26,14 @@ endif()
 project(FoundationMacros
   LANGUAGES Swift)
 
+if(NOT SWIFT_SYSTEM_NAME)
+  if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
+    set(SWIFT_SYSTEM_NAME macosx)
+  else()
+    set(SWIFT_SYSTEM_NAME "$<LOWER_CASE:${CMAKE_SYSTEM_NAME}>")
+  endif()
+endif()
+
 # SwiftSyntax Dependency
 find_package(SwiftSyntax QUIET)
 if(NOT SwiftSyntax_FOUND)