From 898ee9acfdfdaf90a69522ecf6c5fb682c624d84 Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Sat, 12 Aug 2017 16:22:07 -0500
Subject: [PATCH] CMake: Add a check for ADOL-C compatibility

---
 cmake/configure/configure_adolc.cmake | 47 +++++++++++++++++++++++++++
 cmake/modules/FindADOLC.cmake         |  2 +-
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/cmake/configure/configure_adolc.cmake b/cmake/configure/configure_adolc.cmake
index 2a075ea828..1f49003bfb 100644
--- a/cmake/configure/configure_adolc.cmake
+++ b/cmake/configure/configure_adolc.cmake
@@ -17,6 +17,53 @@
 # Configuration for the ADOL-C library:
 #
 
+MACRO(FEATURE_ADOLC_FIND_EXTERNAL var)
+  FIND_PACKAGE(ADOLC)
+
+  IF(ADOLC_FOUND)
+    #
+    # So, we have a library. Let's see whether we can use it:
+    #
+    SET(${var} TRUE)
+
+    #
+    # Check whether we have a recent enough ADOL-C library that can return
+    # values from constant objects.
+    #
+
+    SET(CMAKE_REQUIRED_LIBRARIES ${ADOLC_LIBRARIES})
+    SET(CMAKE_REQUIRED_INCLUDES ${ADOLC_INCLUDE_DIRS})
+    SET(CMAKE_REQUIRED_FLAGS "${DEAL_II_CXX_FLAGS}")
+    CHECK_CXX_SOURCE_COMPILES("
+      #include <adolc/adouble.h>
+      #include <iostream>
+      void print_double(const adouble &val)
+      {
+        std::cout << \"val (non-const): \" << static_cast<double>(val) << std::endl;
+      }
+      int main (int argc, char *argv[])
+      {
+        const adouble val = 1.0;
+        print_double(val);
+      }"
+      ADOLC_DOUBLE_CAST_CHECK)
+
+    IF(NOT ADOLC_DOUBLE_CAST_CHECK)
+      MESSAGE(STATUS
+        "Could not find a sufficient ADOL-C installation: "
+        "deal.II needs ADOL-C version 2.6.4 or newer."
+        )
+      SET(ADOLC_ADDITIONAL_ERROR_STRING
+        ${ADOLC_ADDITIONAL_ERROR_STRING}
+        "Could not find a sufficient ADOL-C installation:\n"
+        "ADOL-C cast check failed.\n"
+        "deal.II needs ADOL-C version 2.6.4 or newer."
+        )
+      SET(${var} FALSE)
+    ENDIF()
+  ENDIF()
+ENDMACRO()
+
 
 MACRO(FEATURE_ADOLC_CONFIGURE_EXTERNAL)
   SET(DEAL_II_ADOLC_WITH_ATRIG_ERF ${ADOLC_WITH_ATRIG_ERF})
diff --git a/cmake/modules/FindADOLC.cmake b/cmake/modules/FindADOLC.cmake
index c216dc564f..e98e38644c 100644
--- a/cmake/modules/FindADOLC.cmake
+++ b/cmake/modules/FindADOLC.cmake
@@ -16,7 +16,7 @@
 # Note: This file is adapted from https://raw.githubusercontent.com/joaoleal/CppADCodeGen/master/cmake/FindADOLC.cmake
 
 #
-# - Try to find Adolc
+# Try to find Adolc
 #
 # This module exports
 #
-- 
2.39.5