dnl -*- mode: Autoconf; -*-

dnl ----------------------------------------------------------------------------
dnl checks if the CC compiler supports an option
dnl
dnl usage: TRI_TRY_CC_OPTION(flag, action-if-ok, action-if-no-ok)
dnl ----------------------------------------------------------------------------

AC_DEFUN([TRI_TRY_CC_OPTION],
         [AC_MSG_CHECKING([$1 for $CC])
          AS_IF([AC_TRY_COMMAND([${CC} -Werror $1 -xc /dev/null -S -o /dev/null])],
                AC_MSG_RESULT([yes])
                [$2], 
                AC_MSG_RESULT([no])
                [$3])])

dnl ----------------------------------------------------------------------------
dnl checks if the C++ compiler supports an option
dnl
dnl usage: TRI_TRY_CXX_OPTION(flag, action-if-ok, action-if-no-ok)
dnl ----------------------------------------------------------------------------

AC_DEFUN([TRI_TRY_CXX_OPTION],
         [AC_MSG_CHECKING([$1] for $CXX)
          AS_IF([AC_TRY_COMMAND([${CXX} -Werror $1 -xc++ /dev/null -S -o /dev/null])],
                AC_MSG_RESULT([yes])
                [$2], 
                AC_MSG_RESULT([no])
                [$3])])

dnl ----------------------------------------------------------------------------
dnl generate correct include, either -I oder -isystem
dnl ----------------------------------------------------------------------------

AC_DEFUN([TR_INCLUDE],[
  if test "x$1" != "x";  then
    if test "x$INCPREFIX" != "x-I";  then
      $1=`echo $[]$1 | sed -e "s:-I:$INCPREFIX:g"`
    fi
  fi
])

dnl ----------------------------------------------------------------------------
dnl find absolute path for library
dnl
dnl usage: TR_LIBRARY(library name)
dnl
dnl returns: tr_library
dnl ----------------------------------------------------------------------------

AC_DEFUN([TR_LIBRARY],[
  tr_library=""

  for tr_path in $LDFLAGS;  do
    case $tr_path in
      -L*)
        path=`echo $tr_path | sed -e 's:^-L::'`
        if test -f "$path/lib$1.a";  then
          tr_library="$path/lib$1.a"
        fi
        ;;
    esac
  done
])

dnl ----------------------------------------------------------------------------
dnl check for std::unordered_map::emplace() 
dnl ----------------------------------------------------------------------------

AC_DEFUN([AX_CXX_CHECK_UNORDERED_MAP_EMPLACE], [
  AC_LANG_PUSH([C++])
  AC_MSG_CHECKING([whether C++ has support for std::unordered_map::emplace()])
  AC_COMPILE_IFELSE(
    [AC_LANG_SOURCE[
      #include <unordered_map>
      void test () {
        std::unordered_map<int, int> x; 
        x.emplace(1, 1); 
      }
    ]],
    [eval unordered_map_emplace=yes], 
    [eval unordered_map_emplace=no]
  )
  AC_MSG_RESULT([$unordered_map_emplace])
  AC_LANG_POP([C++])
  if test x$unordered_map_emplace = xno; then
    AC_MSG_ERROR([C++ has no support for std::unordered_map::emplace()])
  fi
])