From d15e4b04a8b333d0adc09e321241a6a5daa9b94a Mon Sep 17 00:00:00 2001
From: vrouvrea <vrouvrea@636b058d-ea47-450e-bf9e-a15bfbe3eedb>
Date: Thu, 4 Feb 2016 12:17:04 +0000
Subject: test with include CGAL_USE_FILE to fix windows issue

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/Win64_Boost_Xunit_fix@1000 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 11a5fb78933306cfc83951174b38a03837fef58a
---
 src/Simplex_tree/example/CMakeLists.txt | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/src/Simplex_tree/example/CMakeLists.txt b/src/Simplex_tree/example/CMakeLists.txt
index c70cfe35..de75415d 100644
--- a/src/Simplex_tree/example/CMakeLists.txt
+++ b/src/Simplex_tree/example/CMakeLists.txt
@@ -14,11 +14,24 @@ add_test(mini_simplex_tree ${CMAKE_CURRENT_BINARY_DIR}/mini_simplex_tree)
 
 # An example with Simplex-tree using CGAL alpha_shapes_3
 if(GMP_FOUND AND CGAL_FOUND)
-   message("CGAL_lib = ${CGAL_LIBRARIES_DIR}")
-   message("GMP_LIBRARIES = ${GMP_LIBRARIES}")
-   INCLUDE_DIRECTORIES(${GMP_INCLUDE_DIR})
-   INCLUDE_DIRECTORIES(${CGAL_INCLUDE_DIRS})
-   add_executable ( simplex_tree_from_alpha_shapes_3 simplex_tree_from_alpha_shapes_3.cpp )
-   target_link_libraries(simplex_tree_from_alpha_shapes_3 ${GMP_LIBRARIES} ${CGAL_LIBRARY})
-   add_test(simplex_tree_from_alpha_shapes_3 ${CMAKE_CURRENT_BINARY_DIR}/simplex_tree_from_alpha_shapes_3 ${CMAKE_SOURCE_DIR}/data/points/bunny_5000)
+  include( ${CGAL_USE_FILE} )
+  # In CMakeLists.txt, when include(${CGAL_USE_FILE}), CXX_FLAGS are overwritten.
+  # cf. http://doc.cgal.org/latest/Manual/installation.html#title40
+  # A workaround is to add "-std=c++11" again.
+  # A fix would be to use https://cmake.org/cmake/help/v3.1/prop_gbl/CMAKE_CXX_KNOWN_FEATURES.html 
+  # or even better https://cmake.org/cmake/help/v3.1/variable/CMAKE_CXX_STANDARD.html
+  # but it implies to use cmake version 3.1 at least.
+  if(NOT MSVC)
+    include(CheckCXXCompilerFlag)
+    CHECK_CXX_COMPILER_FLAG(-std=c++11 COMPILER_SUPPORTS_CXX11)
+    if(COMPILER_SUPPORTS_CXX11)
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+    endif()
+  endif()
+  # - End of workaround
+
+  INCLUDE_DIRECTORIES(${GMP_INCLUDE_DIR})
+  add_executable ( simplex_tree_from_alpha_shapes_3 simplex_tree_from_alpha_shapes_3.cpp )
+  target_link_libraries(simplex_tree_from_alpha_shapes_3 ${GMP_LIBRARIES} ${CGAL_LIBRARY})
+  add_test(simplex_tree_from_alpha_shapes_3 ${CMAKE_CURRENT_BINARY_DIR}/simplex_tree_from_alpha_shapes_3 ${CMAKE_SOURCE_DIR}/data/points/bunny_5000)
 endif()
-- 
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