Create FortranCInterface_VERIFY function

This function builds a simple test project using a combination of
Fortran and C (and optionally C++) to verify that the compilers are
compatible.  The idea is to help projects report very early to users
that the compilers specified cannot mix languages.

6 files changed, 48 insertions, 0 deletions

diff --git a/Modules/FortranCInterface/Detect.cmake b/Modules/FortranCInterface/Detect.cmake
index b848d33..abc012e 100644
--- a/Modules/FortranCInterface/Detect.cmake
+++ b/Modules/FortranCInterface/Detect.cmake
@@ -17,6 +17,10 @@ else()
   return()
 endif()
 
+# Invalidate verification results.
+unset(FortranCInterface_VERIFIED_C CACHE)
+unset(FortranCInterface_VERIFIED_CXX CACHE)
+
 set(_result)
 
 # Build a sample project which reports symbols.
diff --git a/Modules/FortranCInterface/Verify/CMakeLists.txt b/Modules/FortranCInterface/Verify/CMakeLists.txt
new file mode 100644
index 0000000..69fde2d
--- /dev/null
+++ b/Modules/FortranCInterface/Verify/CMakeLists.txt
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 2.7)
+project(VerifyFortranC C Fortran)
+
+option(VERIFY_CXX "Whether to verify C++ and Fortran" OFF)
+if(VERIFY_CXX)
+  enable_language(CXX)
+  set(VerifyCXX VerifyCXX.cxx)
+  add_definitions(-DVERIFY_CXX)
+endif()
+
+include(FortranCInterface)
+
+FortranCInterface_HEADER(VerifyFortran.h SYMBOLS VerifyFortran)
+include_directories(${VerifyFortranC_BINARY_DIR})
+
+add_executable(VerifyFortranC main.c VerifyC.c VerifyFortran.f ${VerifyCXX})
diff --git a/Modules/FortranCInterface/Verify/VerifyC.c b/Modules/FortranCInterface/Verify/VerifyC.c
new file mode 100644
index 0000000..7f847ef
--- /dev/null
+++ b/Modules/FortranCInterface/Verify/VerifyC.c
@@ -0,0 +1,5 @@
+#include <stdio.h>
+void VerifyC(void)
+{
+  printf("VerifyC\n");
+}
diff --git a/Modules/FortranCInterface/Verify/VerifyCXX.cxx b/Modules/FortranCInterface/Verify/VerifyCXX.cxx
new file mode 100644
index 0000000..689fac5
--- /dev/null
+++ b/Modules/FortranCInterface/Verify/VerifyCXX.cxx
@@ -0,0 +1,4 @@
+extern "C" void VerifyCXX(void)
+{
+  delete new int;
+}
diff --git a/Modules/FortranCInterface/Verify/VerifyFortran.f b/Modules/FortranCInterface/Verify/VerifyFortran.f
new file mode 100644
index 0000000..a17e48d
--- /dev/null
+++ b/Modules/FortranCInterface/Verify/VerifyFortran.f
@@ -0,0 +1,3 @@
+      subroutine VerifyFortran
+        print *, 'VerifyFortran'
+      end
diff --git a/Modules/FortranCInterface/Verify/main.c b/Modules/FortranCInterface/Verify/main.c
new file mode 100644
index 0000000..582ef1d
--- /dev/null
+++ b/Modules/FortranCInterface/Verify/main.c
@@ -0,0 +1,16 @@
+extern void VerifyC(void);
+#ifdef VERIFY_CXX
+extern void VerifyCXX(void);
+#endif
+#include "VerifyFortran.h"
+extern void VerifyFortran(void);
+
+int main(void)
+{
+  VerifyC();
+#ifdef VERIFY_CXX
+  VerifyCXX();
+#endif
+  VerifyFortran();
+  return 0;
+}