cmake/modules/CheckCxxHashset.cmake

   1 # - Check if for hash_set.
   2 # CHECK_HASHSET ()
   3 #
   4
   5 include(CheckCXXSourceCompiles)
   6
   7 macro(CHECK_HASHSET)
   8   message(STATUS "Checking for C++ hash_set implementation...")
   9   check_cxx_source_compiles("
  10                 #include <ext/hash_set>
  11                 int main() {
  12                         __gnu_cxx::hash_set<int> t;
  13                 }
  14 "
  15     HAVE_GNU_EXT_HASH_SET
  16     )
  17   if(HAVE_GNU_EXT_HASH_SET)
  18     message(STATUS "C++ hash_set found in 'ext' dir in namespace __gnu_cxx::")
  19   endif(HAVE_GNU_EXT_HASH_SET)
  20
  21   check_cxx_source_compiles("
  22                 #include <ext/hash_set>
  23                 int main() {
  24                         std::hash_set<int> t;
  25                 }
  26 "
  27     HAVE_STD_EXT_HASH_SET
  28     )
  29   if(HAVE_STD_EXT_HASH_SET)
  30     message(STATUS "C++ hash_set found in 'ext' dir in namespace std::")
  31   endif(HAVE_STD_EXT_HASH_SET)
  32
  33   check_cxx_source_compiles("
  34                 #include <hash_set>
  35                 int main() {
  36                         hash_set<int> t;
  37                 }
  38 "
  39     HAVE_GLOBAL_HASH_SET
  40     )
  41   if(HAVE_GLOBAL_HASH_SET)
  42     message(STATUS "C++ hash_set found in global namespace")
  43   endif(HAVE_GLOBAL_HASH_SET)
  44
  45   if(NOT HAVE_GNU_EXT_HASH_SET)
  46     if(NOT HAVE_STD_EXT_HASH_SET)
  47       if(NOT HAVE_GLOBAL_HASH_SET)
  48         message(STATUS "C++ hash_set not found")
  49       endif(NOT HAVE_GLOBAL_HASH_SET)
  50     endif(NOT HAVE_STD_EXT_HASH_SET)
  51   endif(NOT HAVE_GNU_EXT_HASH_SET)
  52 endmacro(CHECK_HASHSET)