CMake strategy modification

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/Win64_Boost_Xunit_fix@1003 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: c917934525e020b54b2f4506b5c9d060a28c9d89

1 files changed, 43 insertions, 24 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 3c38483c..a67e7c92 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -9,33 +9,52 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules/")
 
 find_package(Boost REQUIRED COMPONENTS system filesystem program_options chrono timer REQUIRED)
 
-if (NOT CMAKE_BUILD_TYPE)
- set(CMAKE_BUILD_TYPE "Release")
-endif()
-if(MSVC)
-  SET (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4267 /wd4668 /wd4311 /wd4800 /wd4820 /wd4503 /wd4244 /wd4345 /wd4996 /wd4396 /wd4018")
-else()
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-endif()
-
-set(Boost_USE_STATIC_LIBS        ON)
-set(Boost_USE_MULTITHREADED      ON)
-set(Boost_USE_STATIC_RUNTIME    OFF)
-
-find_package(GMP)
-if(GMP_FOUND)
-  find_package(GMPXX)
-endif()
-
-find_package(CGAL)
-
-# Find TBB package for parallel sort - not mandatory, just optional.
-set(TBB_FIND_QUIETLY ON)
-find_package(TBB)
-
 if(NOT Boost_FOUND)
   message(FATAL_ERROR "NOTICE: This demo requires Boost and will not be compiled.")
 else()
+
+  find_package(GMP)
+  if(GMP_FOUND)
+    INCLUDE_DIRECTORIES(${GMP_INCLUDE_DIR})
+    find_package(GMPXX)
+    if(GMPXX_FOUND)
+      INCLUDE_DIRECTORIES(${GMPXX_INCLUDE_DIR})
+    endif()
+  endif()
+
+  # find CGAL package before set of CXX flags because
+  # in CMakeLists.txt, when include(${CGAL_USE_FILE}), CXX_FLAGS are overwritten.
+  # cf. http://doc.cgal.org/latest/Manual/installation.html#title40
+  set(CGAL_DONT_OVERRIDE_CMAKE_FLAGS TRUE CACHE BOOL "Force CGAL to maintain CMAKE flags")
+  find_package(CGAL)
+  if(CGAL_FOUND)
+    include( ${CGAL_USE_FILE} )
+    set(CMAKE_CXX_CGAL_FOR_GUDHI_FLAGS "-frounding-math")
+  endif()
+
+  if (NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE "Release")
+  endif()
+  if(MSVC)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4267 /wd4668 /wd4311 /wd4800 /wd4820 /wd4503 /wd4244 /wd4345 /wd4996 /wd4396 /wd4018")
+  else()
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 ${CMAKE_CXX_CGAL_FOR_GUDHI_FLAGS}")
+  endif()
+
+  if(CMAKE_BUILD_TYPE MATCHES Debug)
+    message("Compilation flags are: ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_DEBUG}")
+  else()
+    message("Compilation flags are: ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE}")
+  endif()
+
+  set(Boost_USE_STATIC_LIBS        ON)
+  set(Boost_USE_MULTITHREADED      ON)
+  set(Boost_USE_STATIC_RUNTIME    OFF)
+
+  # Find TBB package for parallel sort - not mandatory, just optional.
+  set(TBB_FIND_QUIETLY ON)
+  find_package(TBB)
+
   # BOOST ISSUE result_of vs C++11
   add_definitions(-DBOOST_RESULT_OF_USE_DECLTYPE)
   # BOOST ISSUE with Libraries name resolution under Windows