dnl autoconf script for Vim on Unix
dnl
dnl Process this file with autoconf 2.4 to produce a configure script.
dnl Gnu m4 1.3 or later is also required
dnl

AC_INIT(vim.h)
AC_CONFIG_HEADER(config.h)
AC_DEFINE(UNIX)	dnl or do you think configure may run on a non-unix system?
AC_PROG_MAKE_SET

dnl Checks for programs.
AC_PROG_CC	dnl required by almost everything
AC_PROG_CPP	dnl required by header file checks
AC_ISC_POSIX	dnl required by AC_C_CROSS
AC_C_CROSS	dnl required by AC_TRY_RUN

dnl Set default value for CFLAGS if none is defined or it's empty
if test -z "$CFLAGS"; then
  CFLAGS="-O"
  test "$GCC" = yes && CFLAGS="-O2 -fno-strength-reduce"
fi

dnl you might want to remove this, if it causes too much trouble. I like it:
dnl -Wmissing-prototypes removed, old versions of GCC don't have it
test "$GCC" = yes && CFLAGS="$CFLAGS -Wall -Wshadow"

dnl If configure things we are cross compiling, there is probably something
dnl wrong with the CC or CFLAGS settings, give an understandable error message
if test "$cross_compiling" = yes; then
  AC_MSG_ERROR([cannot compile a simple program, check CC and CFLAGS])
fi

dnl see if the compiler accepts "-Olimit 2000", needed for some systems
dnl because Vim uses very big case statements.
if test "$GCC" != yes; then
  AC_MSG_CHECKING(if compiler accepts -Olimit)
  save_cflags=$CFLAGS
  CFLAGS="$CFLAGS -Olimit 2000"
  AC_TRY_LINK(, ,
	AC_MSG_RESULT(yes),
	AC_MSG_RESULT(no); CFLAGS=$save_cflags)
fi

dnl gcc-cpp has the wonderful -MM option to produce nicer dependencies
test "$GCC" = yes && CPP_MM=M; AC_SUBST(CPP_MM)

if test -f ./toolcheck; then
AC_CHECKING(for buggy tools)
sh ./toolcheck 1>&AC_FD_MSG
fi


dnl Check user requested features
test -z "$with_x" && with_x=yes
test "${enable_gui-no}" != no && with_x=yes
if test "$with_x" = no; then
  AC_MSG_RESULT(defaulting to: don't HAVE_X11)
else
  dnl do this header check early, so that its failure can override user
  dnl requests.

  AC_PATH_PROG(xmkmfpath, xmkmf)

  AC_PATH_XTRA

  dnl On my system the X include dir is found, but the lib dir not. This is a
  dnl desparate try to fix this.

  if test -d "$x_includes" && test ! -d "$x_libraries"; then
    x_libraries=`echo "$x_includes" | sed s/include/lib/`
    AC_MSG_RESULT(Corrected X libraries to $x_libraries)
    X_LIBS="$X_LIBS -L$x_libraries"
    if test "`(uname) 2>/dev/null`" = SunOS &&
          uname -r | grep '^5' >/dev/null; then
      X_LIBS="$X_LIBS -R $x_libraries"
    fi
  fi

  if test -d "$x_libraries" && test ! -d "$x_includes"; then
    x_includes=`echo "$x_libraries" | sed s/lib/include/`
    AC_MSG_RESULT(Corrected X includes to $x_includes)
    X_CFLAGS="$X_CFLAGS -I$x_includes"
  fi

  dnl remove "-I/usr/include " from X_CFLAGS, should not be needed.
  X_CFLAGS="`echo $X_CFLAGS\  | sed 's%-I/usr/include %%'`"

  dnl Check if the X11 header files are correctly installed. On some systems
  dnl Xlib.h includes files that don't exist
    AC_MSG_CHECKING(if X11 header files can be found)
    cflags_save=$CFLAGS
    CFLAGS="$CFLAGS $X_CFLAGS"
    AC_TRY_COMPILE([#include <X11/Xlib.h>], ,
	  AC_MSG_RESULT(yes),
	  AC_MSG_RESULT(no); no_x=yes)
    CFLAGS=$cflags_save

  if test "${no_x-no}" = yes; then with_x=no; else 
    AC_DEFINE(HAVE_X11) 
    X_LIB=-lX11; AC_SUBST(X_LIB)
  fi

  dnl Some systems need -lnsl -lsocket when testing for ICE.
  dnl The check above doesn't do this, try here (again) if X_PRE_LIBS is empty
  dnl and X_EXTRA_LIBS is not empty.  Check for other function then above to
  dnl avoid the cached value

  if test -z "$X_PRE_LIBS" -a -n "$X_EXTRA_LIBS"; then
    ac_save_LDFLAGS="$LDFLAGS"
    LDFLAGS="$LDFLAGS -L$x_libraries"
    AC_CHECK_LIB(ICE, IceOpenConnection,
      [X_PRE_LIBS="$X_PRE_LIBS -lSM -lICE"],, [$X_EXTRA_LIBS])
    LDFLAGS="$ac_save_LDFLAGS"
  fi

fi

test "x$with_x" = xno -a "x$enable_gui" = xyes && enable_gui=no

AC_ARG_ENABLE(gui, 
 [  --enable-gui            X11-Athena or Motif Graphical User Interface],
 AC_MSG_RESULT(option GUI: $enableval), 
 AC_MSG_RESULT(defaulting to: don't support GUI))
 MOTIF_COMMENT=ZZZ; ATHENA_COMMENT=ZZZ
 case "$enable_gui" in
   no | "" )        ;;
   yes|YES)         MOTIF_COMMENT= ; ATHENA_COMMENT= ;;
   motif|MOTIF)     MOTIF_COMMENT= ;;
   athena|ATHENA)   ATHENA_COMMENT= ;;
   *)               AC_MSG_ERROR([Sorry, $enable_gui GUI is not supported.]) ;;
 esac

dnl Check for Motif include files location.
dnl The LAST one found is used, this makes the highest version to be used,
dnl e.g. when Motif1.2 and Motif2.0 are both present.

if test -z "$MOTIF_COMMENT"; then
  gui_includes="`echo $x_includes|sed 's%/[^/][^/]*$%%'` /local/Motif*/include /local/include/Motif* /usr/local/Motif*/include /usr/local/include/Motif* /usr/include/Motif* /usr/Motif*/include /usr/local/include /usr/local/X11*/include /usr/include /usr/X11*/include /usr/include/X11* /usr/dt/include $GUI_INC_LOC"
  AC_MSG_CHECKING(for location of Motif GUI includes)
  GUI_INC_LOC=
  for try in $gui_includes; do
    if test -f "$try/Xm/Xm.h"; then
      GUI_INC_LOC=$try
    fi
  done
  if test -n "$GUI_INC_LOC"; then
    AC_MSG_RESULT($GUI_INC_LOC)
    test "$GUI_INC_LOC" = /usr/include && GUI_INC_LOC=.
    AC_SUBST(GUI_INC_LOC)
  else
    AC_MSG_RESULT(<not found>) 
    MOTIF_COMMENT=ZZZ  
  fi
fi

dnl Check for Motif library files location.
dnl The LAST one found is used, this makes the highest version to be used,
dnl e.g. when Motif1.2 and Motif2.0 are both present.

if test -z "$MOTIF_COMMENT"; then
  gui_libs="`echo $x_libraries|sed 's%/[^/][^/]*$%%'` `echo "$GUI_INC_LOC" | sed s/include/lib/` /local/Motif*/lib /local/lib/Motif* /usr/local/Motif*/lib /usr/local/lib/Motif* /usr/Motif*/lib /usr/lib/Motif* /usr/local/lib /usr/local/X11*/lib /usr/lib /usr/X11*/lib /usr/lib/X11* /usr/dt/lib $GUI_LIB_LOC"
  AC_MSG_CHECKING(for location of Motif GUI libs)
  GUI_LIB_LOC=
  for try in $gui_libs; do
    if test -f "$try/libXm.a" -o -f "$try/libXm.so" -o -f "$try/libXm.sl"; then
      GUI_LIB_LOC=$try
      if test "`(uname) 2>/dev/null`" = SunOS &&
            uname -r | grep '^5' >/dev/null; then
        GUI_LIB_LOC="$GUI_LIB_LOC -R $try"
      fi
    fi
  done
  if test -n "$GUI_LIB_LOC"; then
    AC_MSG_RESULT($GUI_LIB_LOC)
    AC_SUBST(GUI_LIB_LOC)
  else
    AC_MSG_RESULT(<not found>) 
    MOTIF_COMMENT=ZZZ  
  fi
fi

if test -z "$MOTIF_COMMENT"; then
  ATHENA_COMMENT=ZZZ
fi
AC_SUBST(MOTIF_COMMENT)

dnl Check if the Athena files can be found

GUI_X_LIBS=

if test -z "$ATHENA_COMMENT"; then
  AC_MSG_CHECKING(if Athena header files can be found)
  cflags_save=$CFLAGS
  CFLAGS="$CFLAGS $X_CFLAGS"
  AC_TRY_COMPILE([
#include <X11/Intrinsic.h>
#include <X11/Xaw/Paned.h>], ,
    AC_MSG_RESULT(yes),
    AC_MSG_RESULT(no); ATHENA_COMMENT=ZZZ )
  CFLAGS=$cflags_save
fi

if test -z "$ATHENA_COMMENT"; then
  dnl The GUI_INC_LOC and GUI_LIB_LOC must not be empty, use "." (ugly!)
  if test -z "$GUI_INC_LOC"; then
    GUI_INC_LOC=.
  fi
  AC_SUBST(GUI_INC_LOC)
  if test -z "$GUI_LIB_LOC"; then
    GUI_LIB_LOC=.
  fi
  AC_SUBST(GUI_LIB_LOC)
fi

if test -z "$ATHENA_COMMENT" -o -z "$MOTIF_COMMENT"; then
  dnl Check for -lXext, needed on some systems
  ldflags_save=$LDFLAGS
  LDFLAGS="$LDFLAGS $X_LIBS"
  AC_CHECK_LIB(Xext, XShapeQueryExtension, GUI_X_LIBS="-lXext",, -lX11 $X_EXTRA_LIBS)
  LDFLAGS=$ldflags_save

  dnl Execute xmkmf to figure out if -DNARROWPROTO is needed.
  AC_MSG_CHECKING(for extra X11 defines)
  NARROW_PROTO=
  rm -fr conftestdir
  if mkdir conftestdir; then
    cd conftestdir
    cat > Imakefile <<'EOF'
acfindx:
	@echo 'NARROW_PROTO="${PROTO_DEFINES}"'
EOF
    if (xmkmf) >/dev/null 2>/dev/null && test -f Makefile; then
      eval `${MAKE-make} acfindx 2>/dev/null | grep -v make`
    fi
    cd ..
    rm -fr conftestdir
  fi
  if test -z "$NARROW_PROTO"; then
    AC_MSG_RESULT(no)
  else
    AC_MSG_RESULT($NARROW_PROTO)
  fi
  AC_SUBST(NARROW_PROTO)
fi

AC_SUBST(ATHENA_COMMENT)
AC_SUBST(GUI_X_LIBS)

dnl Checks for libraries.
AC_MSG_CHECKING(for sequent/ptx)
AC_EGREP_CPP(yes,
[#ifdef _SEQUENT_
  yes;
#endif
], LIBS="$LIBS -linet" AC_MSG_RESULT(yes), AC_MSG_RESULT(no))

olibs="$LIBS"
if test -n "$TERM_LIB"; then
	LIBS="$LIBS $TERM_LIB"
else
	dnl  On HP-UX 10.10 termcap or termlib should be used instead of
	dnl  curses, because curses is much slower.
	dnl  Older versions of ncurses have bugs, avoid it.
	AC_CHECK_LIB(termcap, tgetent,,
	AC_CHECK_LIB(termlib, tgetent,,
	AC_CHECK_LIB(curses, tgetent,,
	AC_CHECK_LIB(ncurses, tgetent,,
	))))
fi
if test "x$olibs" != "x$LIBS"; then
  AC_MSG_CHECKING(whether we talk terminfo)
  AC_TRY_RUN([main() { exit(strcmp(tgoto("%p1%d", 0, 1), "1") ? 0 : 1); }],
	  AC_MSG_RESULT([no -- we are in termcap land]),
	  AC_MSG_RESULT([yes -- terminfo spoken here]); AC_DEFINE(TERMINFO),
	  AC_MSG_ERROR(failed to compile test program.))
fi

AC_MSG_CHECKING(quality of toupper)
AC_TRY_RUN([#include <ctype.h>
main() { exit(toupper('A') == 'A' && tolower('z') == 'z'); }], 
 AC_DEFINE(BROKEN_TOUPPER) AC_MSG_RESULT(bad),
 AC_MSG_RESULT(good), AC_MSG_ERROR(failed to compile test program))

AC_MSG_CHECKING(whether __DATE__ and __TIME__ work)
AC_TRY_COMPILE(, [fprintf("(" __DATE__ " " __TIME__ ")");],
	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_DATE_TIME),
	AC_MSG_RESULT(no))

dnl Checks for header files.
AC_CHECK_HEADER(elf.h, SVR4=1)
dnl AC_CHECK_HEADER(dwarf.h, SVR4=1)
if test "$SVR4" = 1; then AC_DEFINE(SVR4) AC_CHECK_LIB(elf, main) fi

AC_HEADER_DIRENT

dnl check for standard headers, we don't use this in Vim but other stuff
dnl in autoconf needs it
AC_HEADER_STDC
AC_HEADER_SYS_WAIT

dnl If sys/wait.h is not found it might still exist but not be POSIX
dnl compliant. In that case we define HAVE_UNION_WAIT (for NeXT)
if test $ac_cv_header_sys_wait_h = no; then
   AC_MSG_CHECKING([for sys/wait.h that defines union wait])
   AC_TRY_COMPILE([#include <sys/wait.h>],
			[union wait xx, yy; xx = yy],
		AC_MSG_RESULT(yes)
			AC_DEFINE(HAVE_SYS_WAIT_H)
			AC_DEFINE(HAVE_UNION_WAIT),
		AC_MSG_RESULT(no))
fi

AC_CHECK_HEADERS(stdlib.h string.h sys/select.h sys/utsname.h termcap.h)
AC_CHECK_HEADERS(fcntl.h sgtty.h sys/ioctl.h sys/time.h termio.h)
AC_CHECK_HEADERS(unistd.h stropts.h errno.h strings.h sys/systeminfo.h locale.h)
AC_CHECK_HEADERS(sys/stream.h sys/ptem.h termios.h libc.h sys/statfs.h)
AC_CHECK_HEADERS(sys/poll.h pwd.h)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_MODE_T
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_UID_T
AC_HEADER_TIME

AC_MSG_CHECKING(whether termcap.h contains ospeed)
AC_TRY_LINK([
#ifdef HAVE_TERMCAP_H
# include <termcap.h>
#endif
			], [ospeed = 20000],
	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_OSPEED),
	[AC_MSG_RESULT(no)
	AC_MSG_CHECKING(whether ospeed can be extern)
	AC_TRY_LINK([
#ifdef HAVE_TERMCAP_H
# include <termcap.h>
#endif
extern short ospeed;
			], [ospeed = 20000],
		AC_MSG_RESULT(yes); AC_DEFINE(OSPEED_EXTERN),
		AC_MSG_RESULT(no))]
	)

AC_MSG_CHECKING([whether termcap.h contains UP, BC and PC])
AC_TRY_LINK([
#ifdef HAVE_TERMCAP_H
# include <termcap.h>
#endif
			], [if (UP == 0 && BC == 0) PC = 1],
	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_UP_BC_PC),
	[AC_MSG_RESULT(no)
	AC_MSG_CHECKING([whether UP, BC and PC can be extern])
	AC_TRY_LINK([
#ifdef HAVE_TERMCAP_H
# include <termcap.h>
#endif
extern char *UP, *BC, PC;
			], [if (UP == 0 && BC == 0) PC = 1],
		AC_MSG_RESULT(yes); AC_DEFINE(UP_BC_PC_EXTERN),
		AC_MSG_RESULT(no))]
	)

AC_MSG_CHECKING(whether tputs() uses outfuntype)
AC_TRY_COMPILE([
#ifdef HAVE_TERMCAP_H
# include <termcap.h>
#endif
			], [extern int xx(); tputs("test", 1, (outfuntype)xx)],
	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_OUTFUNTYPE),
	AC_MSG_RESULT(no))

dnl On some SCO machines sys/select redefines struct timeval
AC_MSG_CHECKING([whether sys/select.h and sys/time.h may both be included])
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/time.h>
#include <sys/select.h>], ,
	  AC_MSG_RESULT(yes)
			AC_DEFINE(SYS_SELECT_WITH_SYS_TIME),
	  AC_MSG_RESULT(no))

dnl AC_DECL_SYS_SIGLIST

dnl Checks for library functions. ===================================
AC_PROG_GCC_TRADITIONAL
AC_TYPE_SIGNAL

dnl find out what to use at the end of a signal function
if test $ac_cv_type_signal = void; then
   AC_DEFINE(SIGRETURN, [return])
else
   AC_DEFINE(SIGRETURN, [return 0])
fi

dnl tricky stuff: try to find out if getcwd() is implemented with
dnl system("sh -c pwd")
AC_MSG_CHECKING(getcwd implementation)
AC_TRY_RUN([
char *dagger[] = { "IFS=pwd", 0 };
main()
{
  char buffer[500];
  extern char **environ;
  environ = dagger;
  return getcwd(buffer, 500) ? 0 : 1;
}],
	AC_MSG_RESULT(it is usable),
	AC_MSG_RESULT(it stinks)
		AC_DEFINE(BAD_GETCWD),
	AC_MSG_ERROR(failed to compile test program))

AC_CHECK_FUNCS(sigset getcwd getwd select strcspn strtol setsid setpgid)
AC_CHECK_FUNCS(tgetent memset strerror fchown fsync fchdir lstat)
AC_CHECK_FUNCS(setenv putenv gettimeofday getpwuid getpwnam qsort)

dnl fstatfs() can take 2 to 4 arguments, try to use st_blksize if possible
AC_MSG_CHECKING(for st_blksize)
AC_TRY_COMPILE(
[#include <sys/types.h>
#include <sys/stat.h>],
[	struct stat st;
	int n;

	stat("/", &st);
	n = (int)st.st_blksize;],
	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_ST_BLKSIZE),
	AC_MSG_RESULT(no))

dnl rename needs to be checked separately to work on Nextstep with cc
AC_MSG_CHECKING(for rename)
AC_TRY_LINK([#include <stdio.h>], [rename("this", "that")],
	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_RENAME),
	AC_MSG_RESULT(no))

dnl this generates a warning, because the macro from autoconf is wrong.
dnl just ignore it.
AC_CHECK_SIZEOF(int)

AC_MSG_CHECKING(whether memmove/bcopy/memcpy handle overlaps)
[bcopy_test_prog='
main() {
  char buf[10];
  strcpy(buf, "abcdefghi");
  bcopy(buf, buf + 2, 3);
  if (strncmp(buf, "ababcf", 6))
    exit(1);
  strcpy(buf, "abcdefghi");
  bcopy(buf + 2, buf, 3);
  if (strncmp(buf, "cdedef", 6))
    exit(1);
  exit(0); /* libc version works properly.  */
}']

dnl Check for memmove() before bcopy(), makes memmove() be used when both are
dnl present, fixes problem with incompatibility between Solaris 2.4 and 2.5.

AC_TRY_RUN([#define bcopy(s,d,l) memmove(d,s,l) $bcopy_test_prog],
 AC_DEFINE(USEMEMMOVE) AC_MSG_RESULT(memmove does),
AC_TRY_RUN([$bcopy_test_prog],
 AC_DEFINE(USEBCOPY) AC_MSG_RESULT(bcopy does),
AC_TRY_RUN([#define bcopy(s,d,l) memcpy(d,s,l)  $bcopy_test_prog],
 AC_DEFINE(USEMEMCPY) AC_MSG_RESULT(memcpy does), AC_MSG_RESULT(no),
  AC_MSG_ERROR(failed to compile test program)),
  AC_MSG_ERROR(failed to compile test program)), 
  AC_MSG_ERROR(failed to compile test program)) 

dnl Check how we can run ctags
dnl -t for typedefs (many ctags have this)
dnl -s for static functions (Elvis ctags only?)
dnl -v for variables. Dangerous, most ctags take this for 'vgrind style'.
dnl -i+P to test for Darren Hiebert's ctags (no arguments really needed)
AC_MSG_CHECKING(how to create tags)
test -f tags && mv tags tags.save
(eval etags       /dev/null) < /dev/null 1>&AC_FD_CC 2>&1 && CTAGS="etags"
(eval etags -c    /dev/null) < /dev/null 1>&AC_FD_CC 2>&1 && CTAGS="etags -c"
(eval ctags       /dev/null) < /dev/null 1>&AC_FD_CC 2>&1 && CTAGS="ctags"
(eval ctags -t    /dev/null) < /dev/null 1>&AC_FD_CC 2>&1 && CTAGS="ctags -t"
(eval ctags -ts   /dev/null) < /dev/null 1>&AC_FD_CC 2>&1 && CTAGS="ctags -ts"
(eval ctags -tvs  /dev/null) < /dev/null 1>&AC_FD_CC 2>&1 && CTAGS="ctags -tvs"
(eval ctags -i+P  /dev/null) < /dev/null 1>&AC_FD_CC 2>&1 && CTAGS="ctags -i+P"
test -f tags.save && mv tags.save tags
AC_MSG_RESULT($CTAGS) AC_SUBST(CTAGS)

dnl Check if PREFIX/share exists
dnl unfortunately prefix may not be set here yet
AC_MSG_CHECKING(for default location to put help files)
if test "x$prefix" = xNONE; then
   tt=$ac_default_prefix
else
   tt=$prefix
fi
if test -d "$tt""/share"; then
   HELPDIR="/share"
else
   HELPDIR="/lib"
fi
AC_MSG_RESULT("$tt""$HELPDIR") AC_SUBST(HELPDIR)

dnl write output files
AC_OUTPUT(config.mk)