dnl  Process this file with autoconf to produce a configure script
AC_REVISION($Revision$)

dnl   This configure file is known to work with autoconf-2.57,
dnl   automake versions 1.6.3 and 1.7.5, and libtool versions 1.4.2 and
dnl   1.5.  It should work with autoconf versions 2.50 or better, and
dnl   automake 1.6 or better.

dnl   Initialisation: package name and version number
AC_INIT([ast],[8.0.0],[starlink@jiscmail.ac.uk])
AC_CONFIG_AUX_DIR([build-aux])

dnl   Require autoconf-2.50 at least
AC_PREREQ([2.69])
dnl   Require Starlink automake
AM_INIT_AUTOMAKE([1.8.2-starlink subdir-objects])

dnl   Sanity-check: name a file in the source directory
AC_CONFIG_SRCDIR([ast_link.in])

#   Include defaults for Starlink configurations
STAR_DEFAULTS

#   See if the --with-starmem option has been provided. This sets the
#   preprocesor macro HAVE_STAR_MEM_H.
AC_ARG_WITH(
      [starmem],
      AS_HELP_STRING([--with-starmem],[use starmem library for memory management]),
      AC_DEFINE([HAVE_STAR_MEM_H],[1],[Use the starmem library for memory management]),
)

#   See if the --with-memdebug option has been provided. This sets the
#   preprocesor macro MEM_DEBUG which enables facilities used to track
#   down memory leaks, etc.
AC_ARG_WITH(
      [memdebug],
      AS_HELP_STRING([--with-memdebug],[enable AST memory leak debugging functions]),
      AC_DEFINE([MEM_DEBUG],[1],[enable AST memory leak debugging functions in memory.c]),
)

#   See if the --with-external_pal option has been provided. This sets the
#   preprocesor macro EXTERNAL_PAL which prevents use of the PAL & ERFA
#   library functions that are included in the AST distribution. Suitable
#   link options are used within ast_link(_adam) scripts to pull in libpal.
AC_ARG_WITH([external_pal],
            [ --with-external_pal   Use external PAL and ERFA libraries],
        if test "$withval" = "yes"; then
           external_pal="1"
        else
           external_pal="0"
        fi,
        external_pal="0")
AC_SUBST( EXTERNAL_PAL, $external_pal )
if test "$external_pal" = "1"; then
   AC_SUBST( LIBPAL, "-lpal" )
   AC_DEFINE([EXTERNAL_PAL],[1],[use external PAL and ERFA libraries]),
else
   AC_SUBST( LIBPAL, "" )
fi
AM_CONDITIONAL(EXTERNAL_PAL, test x$external_pal = x1)


#   Checks for programs
AC_PROG_CC
AC_PROG_CPP
LT_INIT
AC_PROG_LN_S

#   If --with-pic=no is set we should honour that.
AM_CONDITIONAL(NOPIC, test x$pic_mode = xno)

#  Conditional defining whether we build with POSIX thread support.
AC_ARG_WITH([pthreads],
            [ --without-pthreads   Build package without POSIX threads support],
        if test "$withval" = "yes"; then
           use_pthreads="1"
        else
           use_pthreads="0"
        fi,
        use_pthreads="1")
if test "$use_pthreads" = "1"; then
AC_CHECK_LIB([pthread], [pthread_create], ,[use_pthreads="0"])
fi
AM_CONDITIONAL(NOTHREADS, test x$use_pthreads = x0)
AC_SUBST(THREADS, $use_pthreads)

# See which variadic function API to use
AC_CHECK_HEADERS(stdarg.h varargs.h, break)

# Can we use backtrace?
AC_CHECK_HEADERS([execinfo.h])
AC_CHECK_FUNCS([backtrace])

# Do we have reentrant strerror and strtok?
AC_CHECK_FUNCS([strerror_r strtok_r])

#  See if we have long doubles (used by the Mapping and Region classes)
AC_CHECK_TYPES([long double])

#  See if we have 64 bit integers.
AC_CHECK_TYPES([int64_t, uint64_t])

# Calculate alternative 64 bit integer sizes
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)

#   ast_link needs to be able to link against the Fortran runtime if
#   necessary
AC_PROG_FC
AC_FC_LIBRARY_LDFLAGS

#   Find an absolute path to the Perl binary, augmenting the path with the
#   location of the Starlink Perl build.  If this fails, then set @PERL@
#   to the backup `/usr/bin/env perl', which will find Perl if it exists
#   in the path at runtime.
AC_PATH_PROG(PERL, perl, [/usr/bin/env perl], [$STARLINK/Perl/bin:$PATH])

#   Function and declaration checks
AC_CHECK_FUNCS([isnan])
AC_CHECK_DECLS([isnan],,,[#include <math.h>
                         ])
AC_CHECK_FUNCS([isfinite])
AC_CHECK_DECLS([isfinite],,,[#include <math.h>
                         ])
STAR_DECLARE_DEPENDENCIES(sourceset, [sst htx])

#  Perform the check that configures f77.h.in for the return type of REAL
#  Fortran functions. On 64-bit g77 with f2c compatibility this is double
#  not float.
STAR_CNF_F2C_COMPATIBLE

# Determine the type of Fortran character string lengths.
STAR_CNF_TRAIL_TYPE

#   Declare the message file.
STAR_MESSGEN(ast_err.msg)

#   Test for non-ANSI behaviour in sscanf on some platforms, reported by
#   Bill Joye. Also check for bad MINGW sscanf. That returns nc=0 in the
#   System test.
AC_MSG_CHECKING([whether the sscanf function is ANSI-compatible])
AC_RUN_IFELSE([AC_LANG_SOURCE([[

#include <stdio.h>
#include <stdlib.h>

int main() {
  char foo[] = " name 1111.1 ";
  char mingw[] = "system= FK4_NO_E";

  char bar[8];
  float ff;
  int system;
  int nc;
  int r;

  nc = 0;
  r = sscanf(foo, " %s %f %n", bar, &ff, &nc);

  if ( nc == 13 ) {
     nc = 0;
     r = sscanf( mingw, "system= %n%*s %n", &system, &nc );
     if ( nc != 0 ) nc = 13;
  }
  exit( ( nc != 13 ) ? 0 : 1 );
}

]])],[
   AC_MSG_RESULT([no]);AC_DEFINE([HAVE_NONANSI_SSCANF],[1],[The sscanf shows the non-ANSI behaviour reported by Bill Joye])
],[AC_MSG_RESULT([yes])],[
   AC_DEFINE([HAVE_NONANSI_SSCANF],[1],[The sscanf may show the non-ANSI behaviour reported by Bill Joye])
])

#   Declare the documentation.  We need to do complicated things to
#   satisfy these targets, so give a non-null value
#   for the second argument, to suppress automatic generation of
#   rules.
STAR_LATEX_DOCUMENTATION([sun210 sun211], [sun210.pdf sun210.tex sun211.pdf sun211.tex sun210.htx_tar sun211.htx_tar])
STAR_PREDIST_SOURCES(sun_master.tex)
STAR_CHECK_PROGS(star2html)
STAR_CHECK_PROGS(prolat, sst)   # prolat is part of SST

AC_CONFIG_HEADERS(config.h)

AC_CONFIG_FILES(Makefile component.xml ast_link ast_link_adam object.h f77.h)
AC_CONFIG_FILES([ast_cpp], [chmod +x ast_cpp])
#   Following are files which are substituted by the Makefile at
#   distribution time, rather than by configure.  They are not distributed.
STAR_PREDIST_SOURCES(version.h.in builddocs.in addversion.in)

AC_OUTPUT