dnl Some useful functions for xforms configure.in                 -*- sh -*-
dnl Author: Jean-Marc Lasgouttes (lasgouttes@lyx.org)
dnl         Lars Gullik Bjnnes (larsbj@lyx.org)
dnl         Allan Rae (rae@lyx.org)


dnl Usage XFORMS_CHECK_VERSION
dnl Sets variables VERSION, FL_VERSION, FL_REVISION, FL_FIXLEVEL and 
dnl xforms_devel_version.
AC_DEFUN([XFORMS_CHECK_VERSION],[
AC_SUBST(PACKAGE, $PACKAGE_NAME)
AC_SUBST(VERSION, $PACKAGE_VERSION)
[eval] `echo $PACKAGE_VERSION | sed -e 's/\(.*\)\.\(.*\)\.\(.*\)/FL_VERSION=\1; FL_REVISION=\2; FL_FIXLEVEL=\3/'`
AC_SUBST(FL_VERSION)
AC_SUBST(FL_REVISION)
AC_SUBST(FL_FIXLEVEL)
echo "configuring xforms version $VERSION"
xforms_devel_version=no
case $VERSION in
dnl (
  *.[[5-9]][[0-9]]) xforms_devel_version=yes
         AC_DEFINE(DEVEL_VERSION, 1, Define if you are building a development version of xforms)
         echo "WARNING: This is a development version. Expect bugs." ;;
esac])

dnl Usage XFORMS_CHECK_LIB_JPEG: Checks for jpeg library
AC_DEFUN([XFORMS_CHECK_LIB_JPEG],[
### Check for Jpeg library
AC_CHECK_LIB(jpeg, jpeg_CreateDecompress, JPEG_LIB="-ljpeg",
	[XFORMS_LIB_ERROR(libjpeg,jpeg)])
AC_SUBST(JPEG_LIB)
])

dnl Usage XFORMS_PATH_XPM: Checks for xpm library and header
AC_DEFUN([XFORMS_PATH_XPM],[
### Check for Xpm library
SAVE_LIBS="$LIBS"
LIBS="$X_PRE_LIBS $LIBS $X_LIBS -lX11 $X_EXTRA_LIBS"
AC_CHECK_LIB(Xpm, XpmCreateBufferFromImage, XPM_LIB="-lXpm",
	[XFORMS_LIB_ERROR(libXpm,Xpm)])
AC_SUBST(XPM_LIB)
LIBS="$SAVE_LIBS"

### Check for Xpm headers
SAVE_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$X_CFLAGS $CPPFLAGS"
xforms_cv_xpm_h_location="<xpm.h>"
AC_CHECK_HEADER(X11/xpm.h,[
  ac_cv_header_xpm_h=yes
  xforms_cv_xpm_h_location="<X11/xpm.h>"],[
AC_CHECK_HEADER(xpm.h,[],[
XFORMS_LIB_ERROR(xpm.h,Xpm)])])
AC_DEFINE_UNQUOTED(XPM_H_LOCATION,$xforms_cv_xpm_h_location,
  [define this to the location of xpm.h to be used with #include, e.g. <xpm.h>])
CPPFLAGS="$SAVE_CPPFLAGS"

### Test for the header version
if test $ac_cv_header_xpm_h = yes; then
  AC_CACHE_CHECK([xpm header version],xforms_cv_xpmversion,
  [ cat > conftest.$ac_ext <<EOF
#line __oline__ "configure"
#include "confdefs.h"

#include XPM_H_LOCATION
"%%%"xforms_cv_xpmv=XpmVersion;xforms_cv_xpmr=XpmRevision"%%%"
EOF
    eval `(eval "$ac_cpp conftest.$ac_ext") 2>&5 | \
      grep '^"%%%"'  2>/dev/null | \
      sed -e 's/^"%%%"\(.*\)"%%%"/\1/' -e 's/ //g'`
    case "$xforms_cv_xpmr" in
changequote(,)
     [0-9]) xformsxpmr_alpha=`echo $xforms_cv_xpmr |tr 123456789 abcdefghi`
	    xformsxpmv_alpha=" (aka 3.$xforms_cv_xpmv$xformsxpmr_alpha)";;
changequote([,])
	 *) ;;
    esac
    xforms_cv_xpmversion="$xforms_cv_xpmv.$xforms_cv_xpmr$xformsxpmv_alpha"
    rm -f conftest*])
  XPM_VERSION=${xforms_cv_xpmversion}
  case "$xforms_cv_xpmr" in
changequote(,)
	[789]|[0-9][0-9]*) ;;
changequote([,])
	*) XFORMS_WARNING([Version $xforms_cv_xpmversion of the Xpm library is a bit old.
   If you experience strange crashes with xforms, try to upgrade
   to at least version 4.7 (aka 3.4g).
   If you have installed a newer version of the library, check whether you
   have an old xpm.h header file in your include path.]);;
  esac
fi])


dnl Usage: XFORMS_ERROR(message)  Displays the warning "message" and sets the
dnl flag xforms_error to yes.
AC_DEFUN([XFORMS_ERROR],[
xforms_error_txt="$xforms_error_txt
** $1
"
xforms_error=yes])


dnl Usage: XFORMS_WARNING(message)  Displays the warning "message" and sets the
dnl flag xforms_warning to yes.
AC_DEFUN([XFORMS_WARNING],[
xforms_warning_txt="$xforms_warning_txt
== $1
"
xforms_warning=yes])


dnl Usage: XFORMS_LIB_ERROR(file,library)  Displays an error message indication
dnl  that 'file' cannot be found because 'lib' may be uncorrectly installed.
AC_DEFUN([XFORMS_LIB_ERROR],[
XFORMS_ERROR([Cannot find $1. Please check that the $2 library
   is correctly installed on your system.])])


dnl Usage: XFORMS_CHECK_ERRORS  Displays a warning message if a XFORMS_ERROR
dnl   has occured previously.
AC_DEFUN([XFORMS_CHECK_ERRORS],[
if test x$xforms_error = xyes; then
cat <<EOF
**** The following problems have been detected by configure.
**** Please check the messages below before running 'make'.
**** (see the section 'Problems' in the INSTALL file)
$xforms_error_txt
$xforms_warning_txt
EOF
else

if test x$xforms_warning = xyes; then
cat <<EOF
=== The following minor problems have been detected by configure.
=== Please check the messages below before running 'make'.
=== (see the section 'Problems' in the INSTALL file)
$xforms_warning_txt
EOF
fi
cat <<EOF
Configuration of xforms was successful.
Type 'make' to compile the program,
and then 'make install' to install it.
EOF
fi])


AC_DEFUN([XFORMS_PROG_CC],
[
AC_LANG_COMPILER(C)

### We might want to get or shut warnings.
AC_ARG_ENABLE(warnings,
  [  --enable-warnings       tell the compiler to display more warnings],,
  [ if test $xforms_devel_version = yes && test $ac_cv_c_compiler_gnu = yes ; then
	enable_warnings=yes;
    else
	enable_warnings=no;
    fi;])

if test x$enable_warnings = xyes ; then
  xforms_flags="$xforms_flags warnings"
  AC_DEFINE(WITH_WARNINGS, 1,
  [Define this if you want to see the warning directives put here and
   there by the developpers to get attention])
fi

### We might want to disable debug
AC_ARG_ENABLE(debug,
  [  --enable-debug          enable debug information],,
  [ if test $xforms_devel_version = yes && test $ac_cv_c_compiler_gnu = yes ; then
	enable_debug=yes;
    else
	enable_debug=no;
    fi;])

### set up optimization
AC_ARG_ENABLE(optimization,
  [  --enable-optimization[=value]   enable compiler optimisation default=-O],,
	enable_optimization=yes;)
case $enable_optimization in
  yes) xforms_opt=-O;;
   no) xforms_opt=;;
    *) xforms_opt=${enable_optimization};;
esac

# set the debug flags correctly.
if test x$GCC = xyes; then
    if test "$ac_test_CFLAGS" = set; then
	CFLAGS=$ac_save_CFLAGS
    else
	CFLAGS="$xforms_opt"
	if test x$enable_debug = xyes ; then
	    CFLAGS="-g $CFLAGS"
	fi
    fi
    if test x$enable_warnings = xyes ; then
	CFLAGS="$CFLAGS -W -Wall"
    fi
fi
])


dnl Usage: XFORMS_WITH_DIR(dir-name,desc,dir-var-name,default-value,
dnl                       [default-yes-value])
dnl  Adds a --with-'dir-name' option (described by 'desc') and puts the
dnl  resulting directory name in 'dir-var-name'.
AC_DEFUN([XFORMS_WITH_DIR],[
  AC_ARG_WITH($1,[  --with-$1        specify $2])
  AC_MSG_CHECKING([for $2])
  if test -z "$with_$3"; then
     AC_CACHE_VAL(xforms_cv_$3, xforms_cv_$3=$4)
  else
    test "x$with_$3" = xyes && with_$3=$5
    xforms_cv_$3="$with_$3"
  fi
  AC_MSG_RESULT($xforms_cv_$3)])


dnl Usage: XFORMS_LOOP_DIR(value,action)
dnl Executes action for values of variable `dir' in `values'. `values' can
dnl use ":" as a separator.
AC_DEFUN([XFORMS_LOOP_DIR],[
IFS="${IFS=	}"; ac_save_ifs="$IFS"; IFS="${IFS}:"
for dir in `eval "echo $1"`; do
  if test ! "$dir" = NONE; then
    test ! -d "$dir" && AC_MSG_ERROR([\"$dir\" is not a directory])
    $2
  fi
done
IFS=$ac_save_ifs
])


dnl Usage: XFORMS_ADD_LIB_DIR(var-name,dir) Adds a -L directive to variable
dnl var-name.
AC_DEFUN([XFORMS_ADD_LIB_DIR],[
$1="${$1} -L$2"
if test "`(uname) 2>/dev/null`" = SunOS &&
    uname -r | grep '^5' >/dev/null; then
  if test $ac_cv_cxx_compiler_gnu = yes ; then
    $1="${$1} -Wl[,]-R$2"
  else
    $1="${$1} -R$2"
  fi
fi])


dnl Usage: XFORMS_ADD_INC_DIR(var-name,dir) Adds a -I directive to variable
dnl var-name.
AC_DEFUN([XFORMS_ADD_INC_DIR],[$1="${$1} -I$2 "])


dnl this is used by the macro below to general a proper config.h.in entry
m4_define([XFORMS_AH_CHECK_DECL],
[AH_TEMPLATE(AS_TR_CPP(HAVE_DECL_$1),
  [Define if you have the prototype for function `$1'])])

dnl Check things are declared in headers to avoid errors or warnings.
dnl Called like XFORMS_CHECK_DECL(function, header1 header2...)
dnl Defines HAVE_DECL_{FUNCTION}
AC_DEFUN([XFORMS_CHECK_DECL],
[XFORMS_AH_CHECK_DECL($1)
for ac_header in $2
do
  AC_MSG_CHECKING([if $1 is declared by header $ac_header])
  AC_EGREP_HEADER($1, $ac_header,
      [AC_MSG_RESULT(yes)
       AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_DECL_$1))
       break],
      [AC_MSG_RESULT(no)])
done])