From 22b96543e5a283990d3b41d740b281597b2617af Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 10 Jul 2009 13:53:38 -0400
Subject: ENH: Test transitive link languages

This test creates a C executable that links to a C++ static library.  On
most platforms the executable will not link unless the C++ linker is
chosen correctly.
---
 Tests/CMakeLists.txt              |  1 +
 Tests/LinkLanguage/CMakeLists.txt | 10 ++++++++++
 Tests/LinkLanguage/LinkLanguage.c |  6 ++++++
 Tests/LinkLanguage/foo.cxx        |  6 ++++++
 4 files changed, 23 insertions(+)
 create mode 100644 Tests/LinkLanguage/CMakeLists.txt
 create mode 100644 Tests/LinkLanguage/LinkLanguage.c
 create mode 100644 Tests/LinkLanguage/foo.cxx

diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index cc0013b..83e11e3 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -92,6 +92,7 @@ IF(BUILD_TESTING)
   ADD_TEST_MACRO(SetLang SetLang)
   ADD_TEST_MACRO(ExternalOBJ ExternalOBJ)
   ADD_TEST_MACRO(LoadCommand LoadedCommand)
+  ADD_TEST_MACRO(LinkLanguage LinkLanguage)
   ADD_TEST_MACRO(LinkLine LinkLine)
   ADD_TEST_MACRO(MacroTest miniMacroTest)
   ADD_TEST_MACRO(FunctionTest miniFunctionTest)
diff --git a/Tests/LinkLanguage/CMakeLists.txt b/Tests/LinkLanguage/CMakeLists.txt
new file mode 100644
index 0000000..89c2982
--- /dev/null
+++ b/Tests/LinkLanguage/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 2.7.20090708)
+project(LinkLanguage C CXX)
+
+add_library(foo STATIC foo.cxx)
+add_executable(LinkLanguage LinkLanguage.c)
+target_link_libraries(LinkLanguage foo)
+
+# CMake should now automatically choose CXX for linking, so we need
+# not set the property:
+#set_property(TARGET LinkLanguage PROPERTY LINKER_LANGUAGE CXX)
diff --git a/Tests/LinkLanguage/LinkLanguage.c b/Tests/LinkLanguage/LinkLanguage.c
new file mode 100644
index 0000000..cf1557c
--- /dev/null
+++ b/Tests/LinkLanguage/LinkLanguage.c
@@ -0,0 +1,6 @@
+extern int foo(void);
+int main()
+{
+  return foo();
+}
+
diff --git a/Tests/LinkLanguage/foo.cxx b/Tests/LinkLanguage/foo.cxx
new file mode 100644
index 0000000..5321c2d
--- /dev/null
+++ b/Tests/LinkLanguage/foo.cxx
@@ -0,0 +1,6 @@
+extern "C" int foo(void)
+{
+  // Reference C++ standard library symbols.
+  delete new int;
+  return 0;
+}
-- 
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