# Process this file with autoconf to produce a configure script.
#   Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
#   Contributed by Dave Love (d.love@dl.ac.uk).
#
#This file is part of GNU Fortran.
#
#GNU Fortran is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 2, or (at your option)
#any later version.
#
#GNU Fortran is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with GNU Fortran; see the file COPYING.  If not, write to
#the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#02111-1307, USA.

AC_PREREQ(2.12.1)
AC_INIT(ftell_.c)

dnl Checks for programs.
# For g77 we'll set CC to point at the built gcc, but this will get it into
# the makefiles
AC_PROG_CC

test "$AR" || AR=ar
AC_SUBST(AR)
AC_PROG_MAKE_SET

dnl Checks for libraries.

dnl Checks for header files.
# Sanity check for the cross-compilation case:
AC_CHECK_HEADER(stdio.h,:,
  [AC_MSG_ERROR([Can't find stdio.h.
You must have a usable C system for the target already installed, at least
including headers and, preferably, the library, before you can configure
the G77 runtime system.  If necessary, install gcc now with \`LANGUAGES=c',
then the target library, then build with \`LANGUAGES=f77'.])])

AC_HEADER_STDC
dnl We could do this if we didn't know we were using gcc
dnl AC_MSG_CHECKING(for prototype-savvy compiler)
dnl AC_CACHE_VAL(g77_cv_sys_proto,                
dnl   [AC_TRY_LINK(,                             
dnl dnl looks screwy because TRY_LINK expects a function body
dnl    [return 0;} int foo (int * bar) {],       
dnl    g77_cv_sys_proto=yes,                      
dnl    [g77_cv_sys_proto=no                       
dnl     AC_DEFINE(KR_headers)])])                
dnl AC_MSG_RESULT($g77_cv_sys_proto)              

AC_MSG_CHECKING(for posix)
AC_CACHE_VAL(g77_cv_header_posix,
  AC_EGREP_CPP(yes,
  [#include <sys/types.h>
#include <unistd.h>
#ifdef _POSIX_VERSION
  yes
#endif
], 
  g77_cv_header_posix=yes,
  g77_cv_header_posix=no))
AC_MSG_RESULT($g77_cv_header_posix)

# We can rely on the GNU library being posix-ish.  I guess checking the 
# header isn't actually like checking the functions, though...
AC_MSG_CHECKING(for GNU library)
AC_CACHE_VAL(g77_cv_lib_gnu,
  AC_EGREP_CPP(yes,
    [#include <stdio.h>
#ifdef __GNU_LIBRARY__
  yes
#endif
], 
  g77_cv_lib_gnu=yes, g77_cv_lib_gnu=no))
AC_MSG_RESULT($g77_cv_lib_gnu)

# Apparently cygwin needs to be special-cased.
AC_MSG_CHECKING([for cyg\`win'32])
AC_CACHE_VAL(g77_cv_sys_cygwin32,
  AC_EGREP_CPP(yes,
  [#ifdef __CYGWIN32__
  yes
#endif
],
  g77_cv_sys_cygwin32=yes,
  g77_cv_sys_cygwin32=no))
AC_MSG_RESULT($g77_cv_sys_cygwin32)

# ditto for mingw32.
AC_MSG_CHECKING([for mingw32])
AC_CACHE_VAL(g77_cv_sys_mingw32,
  AC_EGREP_CPP(yes,
  [#ifdef __MINGW32__
  yes
#endif
],
  g77_cv_sys_mingw32=yes,
  g77_cv_sys_mingw32=no))
AC_MSG_RESULT($g77_cv_sys_mingw32)


AC_CHECK_HEADER(fcntl.h,
   test $g77_cv_header_posix = yes && AC_DEFINE(_POSIX_SOURCE),
   AC_DEFINE(NO_FCNTL) AC_DEFINE(OPEN_DECL))

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_SIZE_T

dnl Checks for library functions.

# This should always succeed on unix.
# Apparently positive result on cygwin loses re. NON_UNIX_STDIO
# (as of cygwin b18). Likewise on mingw.
AC_CHECK_FUNC(fstat)
AC_MSG_CHECKING([need for NON_UNIX_STDIO])
if test $g77_cv_sys_cygwin32 = yes \
  || test $g77_cv_sys_mingw32 = yes \
  || test $ac_cv_func_fstat = no; then
  AC_MSG_RESULT(yes)
  AC_DEFINE(NON_UNIX_STDIO)
else
  AC_MSG_RESULT(no)
fi

AC_CHECK_FUNCS(mkstemp)
AC_CHECK_FUNCS(tempnam)

# posix will guarantee the right behaviour for sprintf, else we can't be
# sure; HEADER_STDC wouldn't be the right check in sunos4, for instance.
# However, on my sunos4/gcc setup unistd.h leads us wrongly to believe
# we're posix-conformant, so always do the test.
AC_MSG_CHECKING(for ansi/posix sprintf result)
dnl This loses if included as an argument to AC_CACHE_VAL because the
dnl changequote doesn't take effect and the [] vanish.
dnl fixme: use cached value
AC_TRY_RUN(changequote(<<, >>)dnl
  <<#include <stdio.h>
    /* does sprintf return the number of chars transferred? */
    main () {char foo[2]; (sprintf(foo, "1") == 1) ? exit(0) : exit(1);}
>>changequote([, ]),
    g77_cv_sys_sprintf_ansi=yes,
    g77_cv_sys_sprintf_ansi=no,
    g77_cv_sys_sprintf_ansi=no)
AC_CACHE_VAL(g77_cv_sys_sprintf_ansi,
     g77_cv_sys_sprintf_ansi=$g77_cv_sys_sprintf_ansi)
dnl We get a misleading `(cached)' message...
AC_MSG_RESULT($g77_cv_sys_sprintf_ansi)

# The cygwin patch takes steps to avoid defining USE_STRLEN here -- I don't
# understand why.
if test $g77_cv_sys_sprintf_ansi != yes; then 
  AC_DEFINE(USE_STRLEN)
fi

# define NON_ANSI_RW_MODES on unix (can't hurt)
AC_MSG_CHECKING(NON_ANSI_RW_MODES)
AC_EGREP_CPP(yes,
[#ifdef unix
  yes
#endif
#ifdef __unix
  yes
#endif
#ifdef __unix__
  yes
#endif
], is_unix=yes, is_unix=no)
# NON_ANSI_RW_MODES shouldn't be necessary on cygwin for binary mounts.
if test $g77_cv_sys_cygwin32 = yes || test $g77_cv_sys_mingw32 = yes; then
  AC_MSG_RESULT(no)
else
  if test $is_unix = yes; then
    AC_DEFINE(NON_ANSI_RW_MODES)
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi
fi

# This EOF_CHAR is a misfeature on unix.
AC_DEFINE(NO_EOF_CHAR_CHECK)

AC_DEFINE(Skip_f2c_Undefs)

AC_OUTPUT(Makefile)

dnl We might have configuration options to:
dnl * change unit preconnexion in err.c (f_init.c)
dnl * -DALWAYS_FLUSH
dnl * -DOMIT_BLANK_CC

dnl Local Variables:
dnl comment-start: "dnl "
dnl comment-end: ""
dnl comment-start-skip: "\\bdnl\\b\\s *"
dnl End: