1 files changed, 72 insertions, 0 deletions
diff --git a/cmake/modules/GUDHI_compilation_flags.cmake b/cmake/modules/GUDHI_compilation_flags.cmake
new file mode 100644
index 00000000..a01d6e13
--- /dev/null
+++ b/cmake/modules/GUDHI_compilation_flags.cmake
@@ -0,0 +1,72 @@
+# This files manage compilation flags required by GUDHI
+
+include(TestCXXAcceptsFlag)
+include(CheckCXXSourceCompiles)
+
+# add a compiler flag only if it is accepted
+macro(add_cxx_compiler_flag _flag)
+  string(REPLACE "-" "_" _flag_var ${_flag})
+  check_cxx_accepts_flag("${_flag}" CXX_COMPILER_${_flag_var}_OK)
+  if(CXX_COMPILER_${_flag_var}_OK)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}")
+  endif()
+endmacro()
+
+function(can_cgal_use_cxx11_thread_local)
+  # This is because of https://github.com/CGAL/cgal/blob/master/Installation/include/CGAL/tss.h
+  # CGAL is using boost thread if thread_local is not ready (requires XCode 8 for Mac).
+  # The test in https://github.com/CGAL/cgal/blob/master/Installation/include/CGAL/config.h
+  #   #if __has_feature(cxx_thread_local) || \
+  #       ( (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 && __cplusplus >= 201103L ) || \
+  #       ( _MSC_VER >= 1900 )
+  #   #define CGAL_CAN_USE_CXX11_THREAD_LOCAL
+  #   #endif
+  set(CGAL_CAN_USE_CXX11_THREAD_LOCAL "
+      int main() {
+      #ifndef __has_feature
+        #define __has_feature(x) 0  // Compatibility with non-clang compilers.
+      #endif
+      #if __has_feature(cxx_thread_local) || \
+          ( (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 && __cplusplus >= 201103L ) || \
+          ( _MSC_VER >= 1900 )
+        bool has_feature_thread_local = true;
+      #else
+        // Explicit error of compilation for CMake test purpose - has_feature_thread_local is not defined
+      #endif
+        bool result = has_feature_thread_local;
+      }  ")
+  check_cxx_source_compiles("${CGAL_CAN_USE_CXX11_THREAD_LOCAL}" CGAL_CAN_USE_CXX11_THREAD_LOCAL_RESULT)
+endfunction()
+
+set (CMAKE_CXX_STANDARD 11)
+
+enable_testing()
+
+if(MSVC)
+  # Turn off some VC++ warnings
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4267 /wd4668 /wd4311 /wd4800 /wd4820 /wd4503 /wd4244 /wd4345 /wd4996 /wd4396 /wd4018")
+endif()
+
+add_cxx_compiler_flag("-Wall")
+
+if (DEBUG_TRACES)
+  # For programs to be more verbose
+  message(STATUS "DEBUG_TRACES are activated")
+  add_definitions(-DDEBUG_TRACES)
+endif()
+
+set(GUDHI_CAN_USE_CXX11_THREAD_LOCAL "
+    int main() {
+      thread_local int result = 0;
+      return result;
+    }  ")
+check_cxx_source_compiles("${GUDHI_CAN_USE_CXX11_THREAD_LOCAL}" GUDHI_CAN_USE_CXX11_THREAD_LOCAL_RESULT)
+if (GUDHI_CAN_USE_CXX11_THREAD_LOCAL_RESULT)
+  add_definitions(-DGUDHI_CAN_USE_CXX11_THREAD_LOCAL)
+endif()
+
+if(CMAKE_BUILD_TYPE MATCHES Debug)
+  message("++ Debug compilation flags are: ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_DEBUG}")
+else()
+  message("++ Release compilation flags are: ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE}")
+endif()