From f6ff19cc9d2ce51791f32b7e4fd0ad6d917a00cc Mon Sep 17 00:00:00 2001
From: Evan Wilde <etceterawilde@gmail.com>
Date: Mon, 12 Sep 2022 15:15:24 -0700
Subject: Tests: Add mixed Swift+CXX source test case

This test ensures we can configure and build mixed source binaries. The
test configures, but fails to verify due to multiple targets emitting
the `lib.c.o` and `lib.cpp.o` outputs. Both the clang build step and the
swift link step report that they emit the `lib.c.o` and `lib.cpp.o`
outputs. The `.o`'s are emitted by clang, not by swift.
---
 Tests/CMakeLists.txt             | 3 +++
 Tests/SwiftMixLib/CMakeLists.txt | 6 ++++++
 Tests/SwiftMixLib/lib.c          | 4 ++++
 Tests/SwiftMixLib/lib.cpp        | 4 ++++
 Tests/SwiftMixLib/lib.swift      | 3 +++
 Tests/SwiftMixLib/main.swift     | 3 +++
 6 files changed, 23 insertions(+)
 create mode 100644 Tests/SwiftMixLib/CMakeLists.txt
 create mode 100644 Tests/SwiftMixLib/lib.c
 create mode 100644 Tests/SwiftMixLib/lib.cpp
 create mode 100644 Tests/SwiftMixLib/lib.swift
 create mode 100644 Tests/SwiftMixLib/main.swift

diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index abe742e..3540aaa 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -394,6 +394,9 @@ if(BUILD_TESTING)
     if(CMake_TEST_XCODE_SWIFT)
       ADD_TEST_MACRO(SwiftMix SwiftMix)
     endif()
+    if(CMAKE_Swift_COMPILER_VERSION VERSION_GREATER_EQUAL 5.1)
+      ADD_TEST_MACRO(SwiftMixLib Swifty)
+    endif()
   endif()
   if(CMAKE_Fortran_COMPILER)
     ADD_TEST_MACRO(FortranOnly FortranOnly)
diff --git a/Tests/SwiftMixLib/CMakeLists.txt b/Tests/SwiftMixLib/CMakeLists.txt
new file mode 100644
index 0000000..40d3498
--- /dev/null
+++ b/Tests/SwiftMixLib/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.24)
+project(SwiftMixLib C CXX Swift)
+
+add_library(SwiftMixedLib lib.c lib.cpp lib.swift)
+add_executable(Swifty main.swift)
+target_link_libraries(Swifty PUBLIC SwiftMixedLib)
diff --git a/Tests/SwiftMixLib/lib.c b/Tests/SwiftMixLib/lib.c
new file mode 100644
index 0000000..8eca512
--- /dev/null
+++ b/Tests/SwiftMixLib/lib.c
@@ -0,0 +1,4 @@
+int add_int(int a, int b)
+{
+  return a + b;
+}
diff --git a/Tests/SwiftMixLib/lib.cpp b/Tests/SwiftMixLib/lib.cpp
new file mode 100644
index 0000000..3e156b8
--- /dev/null
+++ b/Tests/SwiftMixLib/lib.cpp
@@ -0,0 +1,4 @@
+int add(int a, int b)
+{
+  return a + b;
+}
diff --git a/Tests/SwiftMixLib/lib.swift b/Tests/SwiftMixLib/lib.swift
new file mode 100644
index 0000000..61009d8
--- /dev/null
+++ b/Tests/SwiftMixLib/lib.swift
@@ -0,0 +1,3 @@
+public func add(a: Int, b: Int) -> Int {
+    a + b
+}
diff --git a/Tests/SwiftMixLib/main.swift b/Tests/SwiftMixLib/main.swift
new file mode 100644
index 0000000..d2e9364
--- /dev/null
+++ b/Tests/SwiftMixLib/main.swift
@@ -0,0 +1,3 @@
+import SwiftMixedLib
+
+print(add(a: 1, b: 2))
-- 
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