ENH: Test export/import of link interface languages

This extends the ExportImport test.  The Export project creates a C++
static library and exports it.  Then the Import project links the
library into a C executable.  On most platforms the executable will link
only if the C++ linker is chosen correctly.

Tests/ExportImport/CMakeLists.txt

@@ -1,5 +1,5 @@
-cmake_minimum_required (VERSION 2.6)
-project(ExportImport C)
+cmake_minimum_required (VERSION 2.7.20090711)
+project(ExportImport C CXX)
 
 # Wipe out the install tree to make sure the exporter works.
 add_custom_command(
@@ -22,6 +22,21 @@ else(CMAKE_CONFIGURATION_TYPES)
   endif(CMAKE_BUILD_TYPE)
 endif(CMAKE_CONFIGURATION_TYPES)
 
+set(SAME_COMPILER
+  -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
+  -DCMAKE_C_FLAGS:STRING=${CMAKE_C_FLAGS}
+  -DCMAKE_C_FLAGS_DEBUG:STRING=${CMAKE_C_FLAGS_DEBUG}
+  -DCMAKE_C_FLAGS_RELEASE:STRING=${CMAKE_C_FLAGS_RELEASE}
+  -DCMAKE_C_FLAGS_MINSIZEREL:STRING=${CMAKE_C_FLAGS_MINSIZEREL}
+  -DCMAKE_C_FLAGS_RELWITHDEBINFO:STRING=${CMAKE_C_FLAGS_RELWITHDEBINFO}
+  -DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
+  -DCMAKE_CXX_FLAGS:STRING=${CMAKE_CXX_FLAGS}
+  -DCMAKE_CXX_FLAGS_DEBUG:STRING=${CMAKE_CXX_FLAGS_DEBUG}
+  -DCMAKE_CXX_FLAGS_RELEASE:STRING=${CMAKE_CXX_FLAGS_RELEASE}
+  -DCMAKE_CXX_FLAGS_MINSIZEREL:STRING=${CMAKE_CXX_FLAGS_MINSIZEREL}
+  -DCMAKE_CXX_FLAGS_RELWITHDEBINFO:STRING=${CMAKE_CXX_FLAGS_RELWITHDEBINFO}
+  )
+
 # Build and install the exporter.
 add_custom_command(
   OUTPUT ${ExportImport_BINARY_DIR}/ExportProject
@@ -34,13 +49,7 @@ add_custom_command(
     --build-target install
     --build-generator ${CMAKE_GENERATOR}
     --build-makeprogram ${CMAKE_MAKE_PROGRAM}
-    --build-options
-      -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
-      -DCMAKE_C_FLAGS:STRING=${CMAKE_C_FLAGS}
-      -DCMAKE_C_FLAGS_DEBUG:STRING=${CMAKE_C_FLAGS_DEBUG}
-      -DCMAKE_C_FLAGS_RELEASE:STRING=${CMAKE_C_FLAGS_RELEASE}
-      -DCMAKE_C_FLAGS_MINSIZEREL:STRING=${CMAKE_C_FLAGS_MINSIZEREL}
-      -DCMAKE_C_FLAGS_RELWITHDEBINFO:STRING=${CMAKE_C_FLAGS_RELWITHDEBINFO}
+    --build-options ${SAME_COMPILER}
       -DCMAKE_INSTALL_PREFIX:STRING=${ExportImport_BINARY_DIR}/Root
       -DCMAKE_SKIP_RPATH:BOOL=ON
        )
@@ -62,13 +71,7 @@ add_custom_command(
    --build-project Import
    --build-generator ${CMAKE_GENERATOR}
    --build-makeprogram ${CMAKE_MAKE_PROGRAM}
-   --build-options
-     -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
-     -DCMAKE_C_FLAGS:STRING=${CMAKE_C_FLAGS}
-     -DCMAKE_C_FLAGS_DEBUG:STRING=${CMAKE_C_FLAGS_DEBUG}
-     -DCMAKE_C_FLAGS_RELEASE:STRING=${CMAKE_C_FLAGS_RELEASE}
-     -DCMAKE_C_FLAGS_MINSIZEREL:STRING=${CMAKE_C_FLAGS_MINSIZEREL}
-     -DCMAKE_C_FLAGS_RELWITHDEBINFO:STRING=${CMAKE_C_FLAGS_RELWITHDEBINFO}
+   --build-options ${SAME_COMPILER}
      -DCMAKE_INSTALL_PREFIX:STRING=${ExportImport_BINARY_DIR}/Root
      -DCMAKE_SKIP_RPATH:BOOL=ON
      )

Tests/ExportImport/Export/CMakeLists.txt

@@ -1,5 +1,5 @@
-cmake_minimum_required (VERSION 2.6)
-project(Export C)
+cmake_minimum_required (VERSION 2.7.20090711)
+project(Export C CXX)
 
 # Pretend that RelWithDebInfo should link to debug libraries to test
 # the DEBUG_CONFIGURATIONS property.
@@ -45,6 +45,8 @@ set_property(TARGET testLib4 PROPERTY FRAMEWORK 1)
 
 add_library(testLib5 SHARED testLib5.c)
 
+add_library(testLib6 STATIC testLib6.cxx testLib6.c)
+
 # Work-around: Visual Studio 6 does not support per-target object files.
 set(VS6)
 if("${CMAKE_GENERATOR}" MATCHES "Visual Studio 6")
@@ -76,6 +78,7 @@ install(
   TARGETS
   testExe1 testLib1 testLib2 testExe2 testLib3 testLib4 testExe3
   testExe2lib testLib4lib testLib4libdbg testLib4libopt
+  testLib6
   EXPORT exp
   RUNTIME DESTINATION bin
   LIBRARY DESTINATION lib NAMELINK_SKIP
@@ -111,7 +114,7 @@ export(TARGETS testExe1 testLib1 testLib2 testLib3
   NAMESPACE bld_
   FILE ExportBuildTree.cmake
   )
-export(TARGETS testExe2 testLib4 testLib5 testExe3 testExe2lib
+export(TARGETS testExe2 testLib4 testLib5 testLib6 testExe3 testExe2lib
   testLib4lib testLib4libdbg testLib4libopt
   NAMESPACE bld_
   APPEND FILE ExportBuildTree.cmake

Tests/ExportImport/Export/testLib6.c

@@ -0,0 +1,5 @@
+extern int testLib6cxx(void);
+int testLib6(void)
+{
+  return testLib6cxx();
+}

Tests/ExportImport/Export/testLib6.cxx

@@ -0,0 +1,6 @@
+extern "C" int testLib6cxx(void)
+{
+  // Reference C++ standard library symbols.
+  delete new int;
+  return 0;
+}

Tests/ExportImport/Import/A/CMakeLists.txt

@@ -28,6 +28,7 @@ target_link_libraries(imp_testExe1
   exp_testLib3
   exp_testLib4
   exp_testLib5
+  exp_testLib6
   )
 
 # Try building a plugin to an executable imported from the install tree.
@@ -58,6 +59,7 @@ target_link_libraries(imp_testExe1b
   bld_testLib3
   bld_testLib4
   bld_testLib5
+  bld_testLib6
   )
 
 # Try building a plugin to an executable imported from the build tree.

Tests/ExportImport/Import/A/imp_testExe1.c

@@ -5,6 +5,7 @@ extern int testLib3();
 extern int testLib4();
 extern int testLib4lib();
 extern int testLib5();
+extern int testLib6();
 
 /* Switch a symbol between debug and optimized builds to make sure the
    proper library is found from the testLib4 link interface.  */
@@ -18,6 +19,6 @@ extern testLib4libcfg(void);
 int main()
 {
   return (testLib2() + generated_by_testExe1() + testLib3() + testLib4()
-          + testLib5()
+          + testLib5() + testLib6()
           + generated_by_testExe3() + testLib4lib() + testLib4libcfg());
 }

Tests/ExportImport/Import/CMakeLists.txt

@@ -1,5 +1,5 @@
-cmake_minimum_required (VERSION 2.6)
-project(Import C)
+cmake_minimum_required (VERSION 2.7.20090711)
+project(Import C CXX)
 
 # Import everything in a subdirectory.
 add_subdirectory(A)