From 07fc7b75ef981300e7d873091ee90083b18d1c4a Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 22 Dec 2014 19:55:08 -0500
Subject: Tests: Test using objects from a language enabled in a subdirectory
 (#15325)

Add a test case that enables CXX in the top level and C in a subdirectory.
Create an executable in the top level that uses C objects compiled in the
subdirectory.  Strictly speaking this is not defined behavior for all
language combinations, but happens to work in this case.  Test this
behavior since projects might try to use it.
---
 Tests/CMakeLists.txt                 | 1 +
 Tests/CxxSubdirC/CMakeLists.txt      | 4 ++++
 Tests/CxxSubdirC/Cdir/CMakeLists.txt | 2 ++
 Tests/CxxSubdirC/Cdir/Cobj.c         | 1 +
 Tests/CxxSubdirC/main.cxx            | 2 ++
 5 files changed, 10 insertions(+)
 create mode 100644 Tests/CxxSubdirC/CMakeLists.txt
 create mode 100644 Tests/CxxSubdirC/Cdir/CMakeLists.txt
 create mode 100644 Tests/CxxSubdirC/Cdir/Cobj.c
 create mode 100644 Tests/CxxSubdirC/main.cxx

diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index a9cad14..f654330 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -255,6 +255,7 @@ if(BUILD_TESTING)
   endif()
   ADD_TEST_MACRO(COnly COnly)
   ADD_TEST_MACRO(CxxOnly CxxOnly)
+  ADD_TEST_MACRO(CxxSubdirC CxxSubdirC)
   ADD_TEST_MACRO(IPO COnly/COnly)
   ADD_TEST_MACRO(OutDir runtime/OutDir)
   ADD_TEST_MACRO(ObjectLibrary UseCshared)
diff --git a/Tests/CxxSubdirC/CMakeLists.txt b/Tests/CxxSubdirC/CMakeLists.txt
new file mode 100644
index 0000000..52474f8
--- /dev/null
+++ b/Tests/CxxSubdirC/CMakeLists.txt
@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.0)
+project(CxxSubdirC CXX)
+add_subdirectory(Cdir)
+add_executable(CxxSubdirC main.cxx $<TARGET_OBJECTS:Cobj>)
diff --git a/Tests/CxxSubdirC/Cdir/CMakeLists.txt b/Tests/CxxSubdirC/Cdir/CMakeLists.txt
new file mode 100644
index 0000000..08a8757
--- /dev/null
+++ b/Tests/CxxSubdirC/Cdir/CMakeLists.txt
@@ -0,0 +1,2 @@
+enable_language(C)
+add_library(Cobj OBJECT Cobj.c)
diff --git a/Tests/CxxSubdirC/Cdir/Cobj.c b/Tests/CxxSubdirC/Cdir/Cobj.c
new file mode 100644
index 0000000..75a0045
--- /dev/null
+++ b/Tests/CxxSubdirC/Cdir/Cobj.c
@@ -0,0 +1 @@
+int Cobj(void) { return 0; }
diff --git a/Tests/CxxSubdirC/main.cxx b/Tests/CxxSubdirC/main.cxx
new file mode 100644
index 0000000..049220f
--- /dev/null
+++ b/Tests/CxxSubdirC/main.cxx
@@ -0,0 +1,2 @@
+extern "C" int Cobj(void);
+int main() { return Cobj(); }
-- 
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