Removing C++11 checks

ChangeLog.md

@@ -110,6 +110,11 @@
   - CSS edit to enhance the readability of code snippets (David
     Coeurjolly [#1438](https://github.com/DGtal-team/DGtal/pull/1438))
 
+- *Build*
+  - Removing the homemade CPP11 checks, using cmake macro instead
+  (David Coeurjolly, [#1446](https://github.com/DGtal-team/DGtal/pull/1446))
+
+
 # DGtal 1.0
 
 ## New Features / Critical Changes

cmake/CheckDGtalDependencies.cmake

@@ -31,39 +31,6 @@ if ( ZLIB_FOUND )
   SET(DGtalLibDependencies ${DGtalLibDependencies} ${ZLIB_LIBRARIES})
 endif( ZLIB_FOUND )
 
-
-# -----------------------------------------------------------------------------
-# Check some CPP11 features in the compiler
-# -----------------------------------------------------------------------------
-MESSAGE(STATUS "Checking C++11 compatibility:")
-INCLUDE(CheckCPP11)
-IF (CPP11_COMPATIBLE)
-  IF (NOT CPP11_COMPATIBLE_FLAG_SET_BY_USER)
-    IF (NOT MSVC)
-      set(CMAKE_CXX_STANDARD 11) # C++11...
-      set(CMAKE_CXX_STANDARD_REQUIRED ON) #...is required...
-      set(CMAKE_CXX_EXTENSIONS ON)
-      MESSAGE(STATUS "  c++11 enabled by cmake. ")
-    ENDIF()
-  ENDIF()
-  MESSAGE(STATUS "OK.")
-ELSE()
-  MESSAGE(FATAL_ERROR "Your compiler does not support C++11. Please specify another C++ compiler.")
-ENDIF()
-
-
-# -----------------------------------------------------------------------------
-# Fixing Catch issue for C++11 and old GCC
-# -----------------------------------------------------------------------------
-if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-  # require at least gcc 4.7
-  if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
-    add_definitions("-DCATCH_CONFIG_CPP11_NO_IS_ENUM")
-    message(STATUS "Patching Catch for gcc < 4.7")
-  endif()
-endif()
-
-
 # -----------------------------------------------------------------------------
 # Setting librt dependency on Linux
 # -----------------------------------------------------------------------------

cmake/Common.cmake

@@ -28,6 +28,14 @@ foreach(p LIB BIN INCLUDE DATA)
   endif()
 endforeach()
 
+
+
+# -----------------------------------------------------------------------------
+# CPP11 
+# -----------------------------------------------------------------------------
+set (CMAKE_CXX_STANDARD 11)
+set (CMAKE_CXX_STANDARD_REQUIRED TRUE)
+
 # -----------------------------------------------------------------------------
 # Visual Studio : to distinguish between debug and release lib
 # -----------------------------------------------------------------------------

cmake/DGtalConfig.cmake.in

@@ -71,22 +71,6 @@ IF (@COLOR_WITH_ALPHA_ARITH_DGTAL@)
   ADD_DEFINITIONS(-DCOLOR_WITH_ALPHA_ARITH)
 ENDIF(@COLOR_WITH_ALPHA_ARITH_DGTAL@)
 
-# Set c++11 flag only if needed.
-# When user or compiler have not set any std flag.
-try_compile( CPP11_COMPATIBLE_FLAG_SET_BY_USER
-  ${CMAKE_BINARY_DIR}/CMakeTmp
-  "@DGTAL_CMAKE_DIR@/cpp11_check.cpp"
-  CMAKE_FLAGS "-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
-  OUTPUT_VARIABLE OUTPUT
-  )
-
-IF (NOT CPP11_COMPATIBLE_FLAG_SET_BY_USER)
-  set(CMAKE_CXX_STANDARD 11) # C++11...
-  set(CMAKE_CXX_STANDARD_REQUIRED ON) #...is required...
-  set(CMAKE_CXX_EXTENSIONS ON)
-  MESSAGE(STATUS "  c++11 enabled by cmake. ")
-ENDIF()
-
 IF(@GMP_FOUND_DGTAL@)
   ADD_DEFINITIONS("-DWITH_GMP ")
   SET(WITH_GMP 1)

cmake/DGtalConfigGenerator.cmake

@@ -11,15 +11,14 @@ export(TARGETS  DGtal FILE "${PROJECT_BINARY_DIR}/DGtalLibraryDepends.cmake")
 set(DGTAL_INCLUDE_DIRS "${PROJECT_SOURCE_DIR}/src" "${PROJECT_BINARY_DIR}/src")
 set(DGTAL_LIB_DIR "${PROJECT_BINARY_DIR}/src")
 set(DGTAL_CMAKE_DIR "${PROJECT_BINARY_DIR}")
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
 
 configure_file(${PROJECT_SOURCE_DIR}/cmake/DGtalConfig.cmake.in
   "${PROJECT_BINARY_DIR}/DGtalConfig.cmake" @ONLY)
 
 configure_file(${PROJECT_SOURCE_DIR}/cmake/DGtalConfigVersion.cmake.in
   "${PROJECT_BINARY_DIR}/DGtalConfigVersion.cmake" @ONLY)
-# Copy also the cpp11_check.cpp for the build tree.
-file(COPY ${PROJECT_SOURCE_DIR}/cmake/src/cpp11/cpp11_check.cpp
-     DESTINATION ${PROJECT_BINARY_DIR})
 
 # Install the export set for use with the install-tree
 install(EXPORT DGtalLibraryDepends DESTINATION
@@ -39,5 +38,4 @@ configure_file(${PROJECT_SOURCE_DIR}/cmake/DGtalConfigVersion.cmake.in
 install(FILES
   "${PROJECT_BINARY_DIR}/InstallFiles/DGtalConfig.cmake"
   "${PROJECT_BINARY_DIR}/InstallFiles/DGtalConfigVersion.cmake"
-  "${PROJECT_SOURCE_DIR}/cmake/src/cpp11/cpp11_check.cpp"
   DESTINATION "${DGTAL_CMAKE_DIR}" COMPONENT dev)