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    AC_MSG_ERROR([compiler fails struct member size checking.])
  fi
])


dnl CARES_CHECK_COMPILER_SYMBOL_HIDING
dnl -------------------------------------------------
dnl Verify if compiler supports hiding library internal symbols, setting
dnl shell variable supports_symbol_hiding value as appropriate, as well as
dnl variables symbol_hiding_CFLAGS and symbol_hiding_EXTERN when supported.

AC_DEFUN([CARES_CHECK_COMPILER_SYMBOL_HIDING], [
  AC_REQUIRE([CARES_CHECK_COMPILER])dnl
  AC_BEFORE([$0],[CARES_CONFIGURE_SYMBOL_HIDING])dnl
  AC_MSG_CHECKING([if compiler supports hiding library internal symbols])
  supports_symbol_hiding="no"
  symbol_hiding_CFLAGS=""
  symbol_hiding_EXTERN=""
  tmp_CFLAGS=""
  tmp_EXTERN=""
  case "$compiler_id" in
    CLANG)
      dnl All versions of clang support -fvisibility=
      tmp_EXTERN="__attribute__ ((__visibility__ (\"default\")))"
      tmp_CFLAGS="-fvisibility=hidden"
      supports_symbol_hiding="yes"
      ;;
    GNU_C)
      dnl Only gcc 3.4 or later
      if test "$compiler_num" -ge "304"; then
        if $CC --help --verbose 2>&1 | grep fvisibility= > /dev/null ; then
          tmp_EXTERN="__attribute__ ((__visibility__ (\"default\")))"
          tmp_CFLAGS="-fvisibility=hidden"
          supports_symbol_hiding="yes"
        fi
      fi
      ;;
    INTEL_UNIX_C)
      dnl Only icc 9.0 or later
      if test "$compiler_num" -ge "900"; then
        if $CC --help --verbose 2>&1 | grep fvisibility= > /dev/null ; then
          tmp_save_CFLAGS="$CFLAGS"
          CFLAGS="$CFLAGS -fvisibility=hidden"
          AC_LINK_IFELSE([
            AC_LANG_PROGRAM([[
#             include <stdio.h>
            ]],[[
              printf("icc fvisibility bug test");
            ]])
          ],[
            tmp_EXTERN="__attribute__ ((__visibility__ (\"default\")))"
            tmp_CFLAGS="-fvisibility=hidden"
            supports_symbol_hiding="yes"
          ])
          CFLAGS="$tmp_save_CFLAGS"
        fi
      fi
      ;;
    SUNPRO_C)
      if $CC 2>&1 | grep flags >/dev/null && $CC -flags | grep xldscope= >/dev/null ; then
        tmp_EXTERN="__global"
        tmp_CFLAGS="-xldscope=hidden"
        supports_symbol_hiding="yes"
      fi
      ;;
  esac
  if test "$supports_symbol_hiding" = "yes"; then
    tmp_save_CFLAGS="$CFLAGS"
    CFLAGS="$tmp_save_CFLAGS $tmp_CFLAGS"
    squeeze CFLAGS
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $tmp_EXTERN char *dummy(char *buff);
        char *dummy(char *buff)
        {
         if(buff)
           return ++buff;
         else
           return buff;
        }
      ]],[[
        char b[16];
        char *r = dummy(&b[0]);
        if(r)
          return (int)*r;
      ]])
    ],[
      supports_symbol_hiding="yes"
      if test -f conftest.err; then
        grep 'visibility' conftest.err >/dev/null
        if test "$?" -eq "0"; then
          supports_symbol_hiding="no"
        fi
      fi
    ],[
      supports_symbol_hiding="no"
      echo " " >&6
      sed 's/^/cc-src: /' conftest.$ac_ext >&6
      sed 's/^/cc-err: /' conftest.err >&6
      echo " " >&6
    ])
    CFLAGS="$tmp_save_CFLAGS"
  fi
  if test "$supports_symbol_hiding" = "yes"; then
    AC_MSG_RESULT([yes])
    symbol_hiding_CFLAGS="$tmp_CFLAGS"
    symbol_hiding_EXTERN="$tmp_EXTERN"
  else
    AC_MSG_RESULT([no])
  fi
])


dnl CARES_CHECK_COMPILER_PROTOTYPE_MISMATCH
dnl -------------------------------------------------
dnl Verifies if the compiler actually halts after the
dnl compilation phase without generating any object
dnl code file, when the source code tries to redefine
dnl a prototype which does not match previous one.

AC_DEFUN([CARES_CHECK_COMPILER_PROTOTYPE_MISMATCH], [