From 91613bf2c2132fc4b45182146f9367398b6167f0 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Fri, 5 Oct 2018 23:08:39 +0200
Subject: [PATCH] Add support for c++11 snippets

---
 doc/snippets/CMakeLists.txt | 39 ++++++++++++++++++++++---------------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/doc/snippets/CMakeLists.txt b/doc/snippets/CMakeLists.txt
index 1baf32fba..d2f787424 100644
--- a/doc/snippets/CMakeLists.txt
+++ b/doc/snippets/CMakeLists.txt
@@ -6,21 +6,28 @@ foreach(snippet_src ${snippets_SRCS})
   get_filename_component(snippet ${snippet_src} NAME_WE)
   set(compile_snippet_target compile_${snippet})
   set(compile_snippet_src ${compile_snippet_target}.cpp)
-  file(READ ${snippet_src} snippet_source_code)
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/compile_snippet.cpp.in
-                 ${CMAKE_CURRENT_BINARY_DIR}/${compile_snippet_src})
-  add_executable(${compile_snippet_target}
-                 ${CMAKE_CURRENT_BINARY_DIR}/${compile_snippet_src})
-  if(EIGEN_STANDARD_LIBRARIES_TO_LINK_TO)
-    target_link_libraries(${compile_snippet_target} ${EIGEN_STANDARD_LIBRARIES_TO_LINK_TO})
+  if((NOT ${snippet_src} MATCHES "cxx11") OR EIGEN_COMPILER_SUPPORT_CXX11)
+    file(READ ${snippet_src} snippet_source_code)
+    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/compile_snippet.cpp.in
+                  ${CMAKE_CURRENT_BINARY_DIR}/${compile_snippet_src})
+    add_executable(${compile_snippet_target}
+                  ${CMAKE_CURRENT_BINARY_DIR}/${compile_snippet_src})
+    if(EIGEN_STANDARD_LIBRARIES_TO_LINK_TO)
+      target_link_libraries(${compile_snippet_target} ${EIGEN_STANDARD_LIBRARIES_TO_LINK_TO})
+    endif()
+    if(${snippet_src} MATCHES "cxx11")
+      set_target_properties(${compile_snippet_target} PROPERTIES COMPILE_FLAGS "-std=c++11")
+    endif()
+    add_custom_command(
+      TARGET ${compile_snippet_target}
+      POST_BUILD
+      COMMAND ${compile_snippet_target}
+      ARGS >${CMAKE_CURRENT_BINARY_DIR}/${snippet}.out
+    )
+    add_dependencies(all_snippets ${compile_snippet_target})
+    set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/${compile_snippet_src}
+                                PROPERTIES OBJECT_DEPENDS ${snippet_src})
+  else()
+    message("skip snippet ${snippet_src} because compiler does not support C++11")
   endif()
-  add_custom_command(
-    TARGET ${compile_snippet_target}
-    POST_BUILD
-    COMMAND ${compile_snippet_target}
-    ARGS >${CMAKE_CURRENT_BINARY_DIR}/${snippet}.out
-  )
-  add_dependencies(all_snippets ${compile_snippet_target})
-  set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/${compile_snippet_src}
-                              PROPERTIES OBJECT_DEPENDS ${snippet_src})
 endforeach(snippet_src)