# option, cache_name, variable,
# code to execute if yes, code to exectute if fail
AC_DEFUN([AC_SYS_COMPILER_FLAG],
[
  AC_MSG_CHECKING($1)
  OLD_CFLAGS="[$]CFLAGS"
  AC_CACHE_VAL(mysql_cv_option_$2,
  [
    CFLAGS="[$]OLD_CFLAGS $1"
    AC_TRY_LINK([int main(){exit(0);}],mysql_cv_option_$2=yes,mysql_cv_option_$2=no,mysql_cv_option_$2=no)
 ])

  CFLAGS="[$]OLD_CFLAGS"
  
  if test x"[$]mysql_cv_option_$2" = "xyes" ; then
    $3="[$]$3 $1"
    AC_MSG_RESULT(yes)
    $5
  else
    AC_MSG_RESULT(no)
    $4
  fi
])

# arch, option, cache_name, variable
AC_DEFUN([AC_SYS_CPU_COMPILER_FLAG],
[
 if test "`uname -m 2>/dev/null`" = "$1" ; then
    AC_SYS_COMPILER_FLAG($2,$3,$4)
 fi
])

# os, option, cache_name, variable
AC_DEFUN([AC_SYS_OS_COMPILER_FLAG],
[
 if test "x$mysql_cv_sys_os" = "x$1" ; then
    AC_SYS_COMPILER_FLAG($2,$3,$4)
 fi
])

AC_DEFUN([AC_CHECK_NOEXECSTACK],
[
 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
		mysql_cv_as_noexecstack, [dnl
  cat > conftest.c <<EOF
void foo (void) { }
EOF
  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
		     -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
     && grep .note.GNU-stack conftest.s >/dev/null \
     && AC_TRY_COMMAND([${CC-cc} $CCASFLAGS $CPPFLAGS -Wa,--noexecstack
		       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
  then
    mysql_cv_as_noexecstack=yes
  else
    mysql_cv_as_noexecstack=no
  fi
  rm -f conftest*])
 if test $mysql_cv_as_noexecstack = yes; then
   CCASFLAGS="$CCASFLAGS -Wa,--noexecstack"
 fi
])