dnl Process this file with autoconf to produce a configure script.
AC_PREREQ(2.52)

dnl Set the package version
dnl Don't forget to update the PACKAGE, VERSION and BUILDINFO macros in
dnl dmake/win95/microsft/config.h to keep the native Microsoft C++
dnl compiler build happy. 
AC_INIT(dmake, 4.5)
AC_CANONICAL_BUILD
BUILDINFO="$build"

AC_CONFIG_SRCDIR(man/dmake.tf)
AM_INIT_AUTOMAKE

AM_MAINTAINER_MODE

AC_CONFIG_HEADER(config.h)

dnl Extra parameters
AC_ARG_ENABLE(dbug,
[  --enable-dbug:          Enable build with dbug macros.
],,)

AC_ARG_ENABLE(spawn,
[  --enable-spawn:         Enables the use of spawn instead of fork/exec
                          if it is supported.
],,)
dnl Checks for programs.
AC_PROG_CC
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET
AC_PROG_RANLIB

dnl Checks for utilities.
AC_PROG_AWK

dnl Checks for OS
AC_MSG_CHECKING([the operating system])

_os=`uname`

if test `echo $_os | $AWK -F_ '{ print $1 }'` = "CYGWIN"; then
   if test "$GCC" = "yes"; then
      if test `$CC -dumpmachine | $AWK -F- '{ print $3 }'` = "mingw32"; then
         _os="MINGW"
      else
         _os="CYGWIN"
      fi
   else
      _os="MSVC6"
   fi
fi


## At the moment all except mingw builds are OS_TYPE unix
OS_TYPE=unix

## The following allows like systems to share settings this is not meant to
## Imply that these OS are the same thing.
case "$_os" in
	"SunOS")
	  OS_VERSION=solaris  
	  ;;
	"Linux")
	  OS_VERSION=linux
	  ;;
	"CYGWIN")
	  OS_VERSION=cygwin
	  ;;
	"MINGW")
	  OS_VERSION=mingw
	  OS_TYPE=winnt
	  BUILDINFO="Windows / MinGW"
	  ;;
	"MSVC6")
	  OS_VERSION=msvc6
	  OS_TYPE=winnt
	  BUILDINFO="Windows / MS Visual C++"
	  ;;
	"Darwin")
	  OS_VERSION=macosx
	  ;;
	"FreeBSD")
	  OS_VERSION=linux
	  ;;
	"OSF1")
	  OS_VERSION=sysvr4
	  ;;
	"NetBSD")
	  OS_VERSION=linux
	  ;;
	"IRIX")
	  OS_VERSION=sysvr4
	  ;;
	"IRIX64")
	  OS_VERSION=sysvr4
	  ;;
	"GNU")
	  OS_VERSION=linux
	  ;;
	"AIX")
	  OS_VERSION=sysvr4
	  ;;
   *)
      AC_MSG_ERROR([$_os operating system is not suitable to build dmake!])
      ;;
esac

AC_MSG_RESULT([checked ($_os)])

dnl Set OS dependent settings
if test x$OS_TYPE = xunix; then
  OS_SUBDIRS=["unix startup"]
  OS_LIBRARY=unix/libunix.a
else
  OS_SUBDIRS=["win95 msdos startup"]
  OS_LIBRARY=["win95/libwin95.a msdos/libmsdos.a win95/microsft/libmsft.a"]
fi

AC_SUBST(OS_TYPE)
AC_SUBST(OS_VERSION)
AC_DEFINE_UNQUOTED(BUILDINFO, "$BUILDINFO", [Build info string])
AC_SUBST(OS_SUBDIRS)
AC_SUBST(OS_LIBRARY)

if test x$OS_TYPE != xwinnt; then
dnl See iz53148. Only *nix like builds enable parallel makefile processing
dnl and use stdout redirection in the child for _exec_shell()
AC_DEFINE(USE_SANE_EXEC_SHELL_REDIR, 1, [Use sane redirection mechanism for systems that support parallel building, see iz53148.])
dnl iz61170 needs to know of DOS style file names with drive letters.
AC_DEFINE(NO_DRIVE_LETTERS, 1, [Do not check for drive letters. Introduced as an optimization for iz61170.])
fi

dnl =============================================
dnl Enable dbug
dnl =============================================
AC_MSG_CHECKING([whether to do a build with dbug macros])
if test -n "$enable_dbug" && test "$enable_dbug" != "no"; then
   DBUG="1"
   CPPFLAGS="$CPPFLAGS -DDBUG=1 -I\$(top_srcdir)/dbug/dbug"
   AC_MSG_RESULT([yes])
else
   DBUG=""
   AC_MSG_RESULT([no])
fi
AM_CONDITIONAL(DBUG, test -n "$DBUG")

dnl =============================================
dnl Enable spawn
dnl =============================================
AC_MSG_CHECKING([if spawn shall be used])
if test -n "$enable_spawn" && test "$enable_spawn" != "no"; then
   AC_DEFINE(ENABLE_SPAWN, 1, [Enables the use of spawn instead of fork/exec if it is supported.])
   AC_MSG_RESULT([yes])
else
   AC_MSG_RESULT([no])
fi

dnl Predefine the DMAKEROOT macro for unix targets.
eval dmakerootprefix="$datadir"
# $datadir is ${prefix}/share if not overridden
test "x$dmakerootprefix" != "x${dmakerootprefix##NONE}" && dmakerootprefix=${ac_default_prefix}/share

if test x$OS_TYPE = xunix; then
DMAKEROOT_H_LINE1='"DMAKEROOT := '${dmakerootprefix}'/startup",'
fi
AC_SUBST(DMAKEROOT_H_LINE1)

dnl List (all possible) *.in files
AC_CONFIG_FILES(dmakeroot.h Makefile unix/Makefile startup/config.mk \
		startup/Makefile startup/unix/Makefile \
		startup/unix/linux/Makefile startup/unix/solaris/Makefile \
		startup/unix/macosx/Makefile startup/unix/sysvr4/Makefile \
		startup/unix/cygwin/Makefile \
		startup/winnt/Makefile startup/winnt/mingw/Makefile \
		startup/winnt/msvc6/Makefile \
		msdos/Makefile win95/Makefile win95/microsft/Makefile \
		tests/Makefile)

dnl Checks for libraries.

dnl Initialize libtool
#AM_PROG_LIBTOOL

dnl Checks for header files.
AC_HEADER_DIRENT
AC_HEADER_STDC
AC_CHECK_HEADERS(fcntl.h limits.h strings.h sys/types.h sys/stat.h unistd.h errno.h utime.h spawn.h wait.h sys/wait.h sys/time.h)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_OFF_T
AC_TYPE_SIZE_T
AC_CHECK_TYPES(int8)
AC_CHECK_TYPES(uint8)
AC_CHECK_TYPES(int16)
AC_CHECK_TYPES(uint16)
AC_CHECK_TYPES(int32)
AC_CHECK_TYPES(uint32)
AC_HEADER_TIME
AC_CHECK_SIZEOF(short, 2)
AC_CHECK_SIZEOF(int, 4)
AC_CHECK_SIZEOF(long, 4)

dnl Checks for library functions.
AC_FUNC_MEMCMP
AC_TYPE_SIGNAL
AC_FUNC_UTIME_NULL
AC_FUNC_VPRINTF
AC_CHECK_FUNCS(getcwd getwd putenv strcspn strerror strspn strstr setvbuf tzset settz mkstemp tempnam gettimeofday)


dnl *** output to disk ***
AC_OUTPUT