use same AIX XLC compiler options as curl's

AC_MSG_RESULT($need_no_undefined)

AM_CONDITIONAL(NO_UNDEFINED, test x$need_no_undefined = xyes)

dnl **********************************************************************

dnl check if this is the Intel ICC compiler, and if so make it stricter

dnl (convert warning 147 into an error) so that it properly can detect the

dnl gethostbyname_r() version

dnl **********************************************************************

CURL_DETECT_ICC([CFLAGS="$CFLAGS -we 147"])

dnl **********************************************************************

dnl Checks for libraries.

dnl **********************************************************************

       AC_MSG_RESULT(no)

)

dnl Default is to try the thread-safe versions of a few functions

OPT_THREAD=on

dnl detect AIX 4.3 or later

AC_MSG_CHECKING([AIX 4.3 or later])

AC_PREPROC_IFELSE([

#if defined(_AIX) && defined(_AIX43)

printf("just fine");

#else

#error "this is not AIX 4.3 or later"

#endif

],

 [ AC_MSG_RESULT([yes])

   RECENTAIX=yes

   OPT_THREAD=off ],

 [ AC_MSG_RESULT([no]) ]

)

AC_ARG_ENABLE(thread,dnl

AC_HELP_STRING([--disable-thread],[don't look for thread-safe functions])

AC_HELP_STRING([--enable-thread],[look for thread-safe functions]),

[ case "$enableval" in

  no)

    OPT_THREAD=off

    AC_MSG_WARN(c-ares will not get built using thread-safe functions)

    ;;

  *)

    ;;

  esac

]

)

if test X"$OPT_THREAD" = Xoff

then

  AC_DEFINE(DISABLED_THREADSAFE, 1,

    [Set to explicitly specify we don't want to use thread-safe functions])

fi

dnl for recent AIX versions, we skip all the thread-safe checks above since

dnl they claim a thread-safe libc using the standard API. But there are

dnl some functions still not thread-safe. Check for these!

dnl Let's hope this split URL remains working:

dnl http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/ \

dnl genprogc/thread_quick_ref.htm

if test "x$RECENTAIX" = "xyes"; then

  AC_DEFINE(_THREAD_SAFE, 1, [define this if you need it to compile thread-safe code])

  dnl check if this is the IBM xlc compiler

  dnl Details thanks to => http://predef.sourceforge.net/

  AC_MSG_CHECKING([if this is the xlc compiler])

  AC_EGREP_CPP([^__xlC__], [__xlC__],

         dnl action if the text is found, this it has not been replaced by the

         dnl cpp

         XLC="no"

         AC_MSG_RESULT([no]),

         dnl the text was not found, it was replaced by the cpp

         XLC="yes"

         AC_MSG_RESULT([yes])

         CFLAGS="$CFLAGS -qthreaded"

         dnl AIX xlc has to have strict aliasing turned off. If not,

         dnl the optimizer assumes that pointers can only point to

         dnl an object of the same type.

         CFLAGS="$CFLAGS -qnoansialias"

       )

fi

dnl **********************************************************************

dnl Back to "normal" configuring

dnl **********************************************************************