dnl

dnl arch.m4 --- autoconf input file for gawk

dnl

dnl Copyright (C) 1995, 1996, 1998, 1999, 2000, 2003, 2004, 2015

dnl the Free Software Foundation, Inc.

dnl

dnl This file is part of GAWK, the GNU implementation of the

dnl AWK Progamming Language.

dnl

dnl GAWK is free software; you can redistribute it and/or modify

dnl it under the terms of the GNU General Public License as published by

dnl the Free Software Foundation; either version 3 of the License, or

dnl (at your option) any later version.

dnl

dnl GAWK is distributed in the hope that it will be useful,

dnl but WITHOUT ANY WARRANTY; without even the implied warranty of

dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

dnl GNU General Public License for more details.

dnl

dnl You should have received a copy of the GNU General Public License

dnl along with this program; if not, write to the Free Software

dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA

dnl

dnl Check for z/OS Unix Systems Services

AC_DEFUN([AC_ZOS_USS], [

AC_MSG_CHECKING([for z/OS USS compilation])

AC_CACHE_VAL(ac_cv_zos_uss, [

if test "OS/390" = "`uname`"

then

  ac_cv_zos_uss=yes

else

  ac_cv_zos_uss=no

fi

])dnl

AC_MSG_RESULT([${ac_cv_zos_uss}])

if test "x$ac_cv_zos_uss" = "xyes"

then

  dnl Identify the compiler.

  ac_zos_uss_cc_id=unknown

  echo " $CC " | $EGREP [' (/bin/)?c89[ |_]'] >/dev/null && ac_zos_uss_cc_id=c89

  echo " $CC " | $EGREP [' (/bin/)?c99[ |_]'] >/dev/null && ac_zos_uss_cc_id=xlc

  echo " $CC " | $EGREP [' (/bin/)?cc[ |_]']  >/dev/null && ac_zos_uss_cc_id=cc

  echo " $CC " | $EGREP [' (/bin/)?xlc[ |_]'] >/dev/null && ac_zos_uss_cc_id=xlc

  echo " $CC " | $EGREP [' (/bin/)?xlC[ |_]'] >/dev/null && ac_zos_uss_cc_id=xlc++

  echo " $CC " | $EGREP [' (/bin/)?xlc\+\+[ |_]'] >/dev/null && ac_zos_uss_cc_id=xlc++

  test "x$GCC" = "xyes" && ac_zos_uss_cc_id=gcc

  dnl These feature test macros are needed on z/OS.

  CPPFLAGS="$CPPFLAGS -D_ALL_SOURCE -D_OPEN_SYS_UNLOCKED_EXT"

  test "$ac_zos_uss_cc_id" != xlc++ && CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE=600"

  case "$ac_zos_uss_cc_id" in

  c89)

    dnl If the user has set CC=c89 and _C89_OPTIONS, then don't get in

    dnl their way.  c89 (as well as cc) pre-dates xlc, and accepts an

    dnl option syntax that involves parentheses and cannot be handled

    dnl in the usual way in C(PP)FLAGS.  However, c89 will also accept

    dnl options via the aforementioned environment variable, which

    dnl gives the user one way around the problem.  (If you're

    dnl wondering about cc, it is meant for programs written in

    dnl "Common Usage C" [a.k.a. K&R C] as opposed to "Standard C"

    dnl [a.k.a. ANSI], and does not build gawk correctly.)

    if test -n "$_C89_OPTIONS"

    then

      AC_MSG_NOTICE([CC = $CC])

      AC_MSG_NOTICE([_C89_OPTIONS = $_C89_OPTIONS])

    else

      AC_MSG_ERROR([c89-setup-required

To build GNU Awk using "c89", please set

    _C89_OPTIONS="-W c,langlvl(stdc99,libext),haltonmsg(CCN3296)"

in your environment, and reconfigure. (The above flags cannot be specified

in CFLAGS/CPPFLAGS, due to the parentheses.)])

    fi

    ;;

  gcc)

    dnl GCC has not yet been ported to z/OS as of this writing

    ;;

  cc)

    AC_MSG_ERROR([cc-invalid

The z/OS "cc" compiler does not build GNU Awk correctly.

If the "xlc" or "c89" compiler is available, please set CC accordingly

and reconfigure. ("xlc" is the recommended compiler on z/OS.)])

    ;;

  xlc*)

    dnl This enables C99, and on z/OS 1.11, the setenv() prototype.

    CFLAGS="$CFLAGS -qlanglvl=stdc99:libext"

    dnl Use a compiler wrapper script to address some annoyances.

    cat >zos-cc <

#!/bin/sh

#

# This wrapper script addresses two annoying peculiarities of the IBM

# xlc/c99 compiler on z/OS:

#

# 1. Missing header files are considered warnings by default rather

#    than fatal errors;

#

# 2. Include directories specified with -I are searched _after_ the

#    system include directories (for #include<> directives) rather

#    than before.

#

# This script allows the code and the build system to assume standard

# compiler behavior.

#

PS4='zos-cc: '

REAL_CC="$CC"

set -x

\$REAL_CC -qhaltonmsg=CCN3296 -qnosearch "\$[]@" -qsearch=/usr/include

EOF

    chmod +x zos-cc

    AC_MSG_NOTICE([wrapping $CC with zos-cc to obtain standard behavior])

    CC="`pwd`/zos-cc"

    ;;

  *)

    AC_MSG_WARN([unrecognized compiler environment])

    ;;

  esac

fi # ac_cv_zos_uss = yes

])dnl