Tcl Source Code

# Look for libraries that we will need when compiling the Tcl shell
#--------------------------------------------------------------------


    #--------------------------------------------------------------------
    # On a few very rare systems, all of the libm.a stuff is
    # already in libc.a.  Set compiler flags accordingly.
    # Also, Linux requires the "ieee" library for math to work
    # right (and it must appear before "-lm").
    #--------------------------------------------------------------------

    ac_fn_c_check_func "$LINENO" "sin" "ac_cv_func_sin"
if test "x$ac_cv_func_sin" = xyes; then :
  MATH_LIBS=""
else
  MATH_LIBS="-lm"
fi

    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lieee" >&5
$as_echo_n "checking for main in -lieee... " >&6; }
if ${ac_cv_lib_ieee_main+:} false; then :
  $as_echo_n "(cached) " >&6
else
  ac_check_lib_save_LIBS=$LIBS
LIBS="-lieee  $LIBS"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h.  */


int
main ()
{
return main ();
  ;
  return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
  ac_cv_lib_ieee_main=yes
else
  ac_cv_lib_ieee_main=no
fi
rm -f core conftest.err conftest.$ac_objext \
    conftest$ac_exeext conftest.$ac_ext
LIBS=$ac_check_lib_save_LIBS
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ieee_main" >&5
$as_echo "$ac_cv_lib_ieee_main" >&6; }
if test "x$ac_cv_lib_ieee_main" = xyes; then :
  MATH_LIBS="-lieee $MATH_LIBS"
fi


    #--------------------------------------------------------------------
    # Interactive UNIX requires -linet instead of -lsocket, plus it
    # needs net/errno.h to define the socket-related error codes.
    #--------------------------------------------------------------------

    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -linet" >&5

#
#--------------------------------------------------------------------

AC_DEFUN([SC_TCL_LINK_LIBS], [
    #--------------------------------------------------------------------
    # On a few very rare systems, all of the libm.a stuff is
    # already in libc.a.  Set compiler flags accordingly.
    # Also, Linux requires the "ieee" library for math to work
    # right (and it must appear before "-lm").
    #--------------------------------------------------------------------

    AC_CHECK_FUNC(sin, MATH_LIBS="", MATH_LIBS="-lm")
    AC_CHECK_LIB(ieee, main, [MATH_LIBS="-lieee $MATH_LIBS"])

    #--------------------------------------------------------------------
    # Interactive UNIX requires -linet instead of -lsocket, plus it
    # needs net/errno.h to define the socket-related error codes.
    #--------------------------------------------------------------------

    AC_CHECK_LIB(inet, main, [LIBS="$LIBS -linet"])