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[bug-gnulib] Re: new modules for C# interoperability
|
From: |
Bruno Haible |
|
Subject: |
[bug-gnulib] Re: new modules for C# interoperability |
|
Date: |
Wed, 1 Jun 2005 12:35:55 +0200 |
|
User-agent: |
KMail/1.5 |
There were no comments on csharpexec, no I committed this module.
Here comes the module for compiling a C# program.
============================= modules/csharpcomp =============================
Description:
Compile a C# program.
Files:
lib/csharpcomp.h
lib/csharpcomp.c
lib/csharpcomp.sh.in
m4/csharpcomp.m4
m4/csharp.m4
Depends-on:
stdbool
xallocsa
execute
pipe
wait-process
getline
sh-quote
safe-read
error
gettext
configure.ac:
gt_CSHARPCOMP
Makefile.am:
lib_SOURCES += csharpcomp.h csharpcomp.c
EXTRA_DIST += csharpcomp.sh.in
Include:
"csharpcomp.h"
License:
GPL
Maintainer:
Bruno Haible
============================ lib/csharpcomp.sh.in ============================
#!/bin/sh
# Compile a C# program.
# Copyright (C) 2003-2005 Free Software Foundation, Inc.
# Written by Bruno Haible <address@hidden>, 2003.
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
# This uses the same choices as csharpcomp.c, but instead of relying on the
# environment settings at run time, it uses the environment variables
# present at configuration time.
#
# This is a separate shell script, because the various C# compilers have
# different command line options.
#
# Usage: /bin/sh csharpcomp.sh [OPTION] SOURCE.cs ... RES.resource ...
# Options:
# -o PROGRAM.exe or -o LIBRARY.dll
# set the output assembly name
# -L DIRECTORY search for C# libraries also in DIRECTORY
# -l LIBRARY reference the C# library LIBRARY.dll
# -O optimize
# -g generate debugging information
# func_tmpdir
# creates a temporary directory.
# Sets variable
# - tmp pathname of freshly created temporary directory
func_tmpdir ()
{
# Use the environment variable TMPDIR, falling back to /tmp. This allows
# users to specify a different temporary directory, for example, if their
# /tmp is filled up or too small.
: ${TMPDIR=/tmp}
{
# Use the mktemp program if available. If not available, hide the error
# message.
tmp=`(umask 077 && mktemp -d -q "$TMPDIR/gtXXXXXX") 2>/dev/null` &&
test -n "$tmp" && test -d "$tmp"
} ||
{
# Use a simple mkdir command. It is guaranteed to fail if the directory
# already exists. $RANDOM is bash specific and expands to empty in shells
# other than bash, ksh and zsh. Its use does not increase security;
# rather, it minimizes the probability of failure in a very cluttered /tmp
# directory.
tmp=$TMPDIR/gt$$-$RANDOM
(umask 077 && mkdir "$tmp")
} ||
{
echo "$0: cannot create a temporary directory in $TMPDIR" >&2
{ (exit 1); exit 1; }
}
}
sed_quote_subst='s/\([|&;<>()$`"'"'"'*?[#~=% \\]\)/\\\1/g'
options_cscc=
options_mcs=
options_csc="-nologo"
sources=
while test $# != 0; do
case "$1" in
-o)
case "$2" in
*.dll)
options_cscc="$options_cscc -shared"
options_mcs="$options_mcs -target:library"
options_csc="$options_csc -target:library"
;;
*.exe)
options_csc="$options_csc -target:exe"
;;
esac
options_cscc="$options_cscc -o "`echo "$2" | sed -e "$sed_quote_subst"`
options_mcs="$options_mcs -o "`echo "$2" | sed -e "$sed_quote_subst"`
options_csc="$options_csc -out:"`echo "$2" | sed -e "$sed_quote_subst"`
shift
;;
-L)
options_cscc="$options_cscc -L "`echo "$2" | sed -e "$sed_quote_subst"`
options_mcs="$options_mcs -L "`echo "$2" | sed -e "$sed_quote_subst"`
options_csc="$options_csc -lib:"`echo "$2" | sed -e "$sed_quote_subst"`
shift
;;
-l)
options_cscc="$options_cscc -l "`echo "$2" | sed -e "$sed_quote_subst"`
options_mcs="$options_mcs -r "`echo "$2" | sed -e "$sed_quote_subst"`
options_csc="$options_csc -reference:"`echo "$2" | sed -e
"$sed_quote_subst"`
shift
;;
-O)
options_cscc="$options_cscc -O"
options_csc="$options_csc -optimize+"
;;
-g)
options_cscc="$options_cscc -g"
options_mcs="$options_mcs -g"
options_csc="$options_csc -debug+"
;;
-*)
echo "csharpcomp: unknown option '$1'" 1>&2
exit 1
;;
*.resource)
options_cscc="$options_cscc -fresources="`echo "$1" | sed -e
"$sed_quote_subst"`
options_mcs="$options_mcs -resource:"`echo "$1" | sed -e
"$sed_quote_subst"`
options_csc="$options_csc -resource:"`echo "$1" | sed -e
"$sed_quote_subst"`
;;
*.cs)
sources="$sources "`echo "$1" | sed -e "$sed_quote_subst"`
;;
*)
echo "csharpcomp: unknown type of argument '$1'" 1>&2
exit 1
;;
esac
shift
done
if test -n "@HAVE_CSCC@"; then
test -z "$CSHARP_VERBOSE" || echo cscc $options_cscc $sources
exec cscc $options_cscc $sources
else
if test -n "@HAVE_MCS@"; then
# mcs prints it errors and warnings to stdout, not stderr. Furthermore it
# adds a useless line "Compilation succeeded..." at the end. Correct both.
sed_drop_success_line='${
/^Compilation succeeded/d
}'
func_tmpdir
trap 'rm -rf "$tmp"' 1 2 3 15
test -z "$CSHARP_VERBOSE" || echo mcs $options_mcs $sources
mcs $options_mcs $sources > "$tmp"/mcs.err
result=$?
sed -e "$sed_drop_success_line" < "$tmp"/mcs.err >&2
rm -rf "$tmp"
exit $result
else
if test -n "@HAVE_CSC@"; then
test -z "$CSHARP_VERBOSE" || echo csc $options_csc $sources
exec csc $options_csc $sources
else
echo 'C# compiler not found, try installing pnet, then reconfigure' 1>&2
exit 1
fi
fi
fi
============================== lib/csharpcomp.h ==============================
/* Compile a C# program.
Copyright (C) 2003 Free Software Foundation, Inc.
Written by Bruno Haible <address@hidden>, 2003.
This program 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.
This program 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 this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifndef _CSHARPCOMP_H
#define _CSHARPCOMP_H
#include <stdbool.h>
/* Compile a set of C# source files to bytecode.
sources is an array of source file names, including resource files.
libdirs is a list of directories to be searched for libraries.
libraries is a list of libraries on which the program depends.
output_file is the name of the output file; it should end in .exe or .dll.
If verbose, the command to be executed will be printed.
Return false if OK, true on error. */
extern bool compile_csharp_class (const char * const *sources,
unsigned int sources_count,
const char * const *libdirs,
unsigned int libdirs_count,
const char * const *libraries,
unsigned int libraries_count,
const char *output_file,
bool optimize, bool debug,
bool verbose);
#endif /* _CSHARPCOMP_H */
============================== lib/csharpcomp.c ==============================
/* Compile a C# program.
Copyright (C) 2003-2005 Free Software Foundation, Inc.
Written by Bruno Haible <address@hidden>, 2003.
This program 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.
This program 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 this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <alloca.h>
/* Specification. */
#include "csharpcomp.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "execute.h"
#include "pipe.h"
#include "wait-process.h"
#include "getline.h"
#include "sh-quote.h"
#include "safe-read.h"
#include "xallocsa.h"
#include "error.h"
#include "gettext.h"
#define _(str) gettext (str)
/* Survey of C# compilers.
Program from
cscc pnet
mcs mono
csc sscli
We try the CIL interpreters in the following order:
1. "cscc", because it is a completely free system.
2. "mcs", because it is a free system but doesn't integrate so well
with Unix. (Command line options start with / instead of -. Errors go
to stdout instead of stderr. Source references are printed as
"file(lineno)" instead of "file:lineno:".)
3. "csc", although it is not free, because it is a kind of "reference
implementation" of C#.
But the order can be changed through the --enable-csharp configuration
option.
*/
static int
compile_csharp_using_pnet (const char * const *sources,
unsigned int sources_count,
const char * const *libdirs,
unsigned int libdirs_count,
const char * const *libraries,
unsigned int libraries_count,
const char *output_file, bool output_is_library,
bool optimize, bool debug,
bool verbose)
{
static bool cscc_tested;
static bool cscc_present;
if (!cscc_tested)
{
/* Test for presence of cscc:
"cscc --version >/dev/null 2>/dev/null" */
char *argv[3];
int exitstatus;
argv[0] = "cscc";
argv[1] = "--version";
argv[2] = NULL;
exitstatus = execute ("cscc", "cscc", argv, false, false, true, true,
true, false);
cscc_present = (exitstatus == 0);
cscc_tested = true;
}
if (cscc_present)
{
unsigned int argc;
char **argv;
char **argp;
int exitstatus;
unsigned int i;
argc =
1 + (output_is_library ? 1 : 0) + 2 + 2 * libdirs_count
+ 2 * libraries_count + (optimize ? 1 : 0) + (debug ? 1 : 0)
+ sources_count;
argv = (char **) xallocsa ((argc + 1) * sizeof (char *));
argp = argv;
*argp++ = "cscc";
if (output_is_library)
*argp++ = "-shared";
*argp++ = "-o";
*argp++ = (char *) output_file;
for (i = 0; i < libdirs_count; i++)
{
*argp++ = "-L";
*argp++ = (char *) libdirs[i];
}
for (i = 0; i < libraries_count; i++)
{
*argp++ = "-l";
*argp++ = (char *) libraries[i];
}
if (optimize)
*argp++ = "-O";
if (debug)
*argp++ = "-g";
for (i = 0; i < sources_count; i++)
{
const char *source_file = sources[i];
if (strlen (source_file) >= 9
&& memcmp (source_file + strlen (source_file) - 9, ".resource",
9) == 0)
{
char *option = (char *) xallocsa (12 + strlen (source_file) + 1);
memcpy (option, "-fresources=", 12);
strcpy (option + 12, source_file);
*argp++ = option;
}
else
*argp++ = (char *) source_file;
}
*argp = NULL;
/* Ensure argv length was correctly calculated. */
if (argp - argv != argc)
abort ();
if (verbose)
{
char *command = shell_quote_argv (argv);
printf ("%s\n", command);
free (command);
}
exitstatus = execute ("cscc", "cscc", argv, false, false, false, false,
true, true);
for (i = 0; i < sources_count; i++)
if (argv[argc - sources_count + i] != sources[i])
freesa (argv[argc - sources_count + i]);
freesa (argv);
return (exitstatus != 0);
}
else
return -1;
}
static int
compile_csharp_using_mono (const char * const *sources,
unsigned int sources_count,
const char * const *libdirs,
unsigned int libdirs_count,
const char * const *libraries,
unsigned int libraries_count,
const char *output_file, bool output_is_library,
bool optimize, bool debug,
bool verbose)
{
static bool mcs_tested;
static bool mcs_present;
if (!mcs_tested)
{
/* Test for presence of mcs:
"mcs --version >/dev/null 2>/dev/null" */
char *argv[3];
int exitstatus;
argv[0] = "mcs";
argv[1] = "--version";
argv[2] = NULL;
exitstatus = execute ("mcs", "mcs", argv, false, false, true, true, true,
false);
mcs_present = (exitstatus == 0);
mcs_tested = true;
}
if (mcs_present)
{
unsigned int argc;
char **argv;
char **argp;
pid_t child;
int fd[1];
FILE *fp;
char *line[2];
size_t linesize[2];
size_t linelen[2];
unsigned int l;
int exitstatus;
unsigned int i;
argc =
1 + (output_is_library ? 1 : 0) + 2 + 2 * libdirs_count
+ 2 * libraries_count + (debug ? 1 : 0) + sources_count;
argv = (char **) xallocsa ((argc + 1) * sizeof (char *));
argp = argv;
*argp++ = "mcs";
if (output_is_library)
*argp++ = "-target:library";
*argp++ = "-o";
*argp++ = (char *) output_file;
for (i = 0; i < libdirs_count; i++)
{
*argp++ = "-L";
*argp++ = (char *) libdirs[i];
}
for (i = 0; i < libraries_count; i++)
{
*argp++ = "-r";
*argp++ = (char *) libraries[i];
}
if (debug)
*argp++ = "-g";
for (i = 0; i < sources_count; i++)
{
const char *source_file = sources[i];
if (strlen (source_file) >= 9
&& memcmp (source_file + strlen (source_file) - 9, ".resource",
9) == 0)
{
char *option = (char *) xallocsa (10 + strlen (source_file) + 1);
memcpy (option, "-resource:", 10);
strcpy (option + 10, source_file);
*argp++ = option;
}
else
*argp++ = (char *) source_file;
}
*argp = NULL;
/* Ensure argv length was correctly calculated. */
if (argp - argv != argc)
abort ();
if (verbose)
{
char *command = shell_quote_argv (argv);
printf ("%s\n", command);
free (command);
}
child = create_pipe_in ("mcs", "mcs", argv, NULL, false, true, true, fd);
/* Read the subprocess output, copying it to stderr. Drop the last
line if it starts with "Compilation succeeded". */
fp = fdopen (fd[0], "r");
if (fp == NULL)
error (EXIT_FAILURE, errno, _("fdopen() failed"));
line[0] = NULL; linesize[0] = 0;
line[1] = NULL; linesize[1] = 0;
l = 0;
for (;;)
{
linelen[l] = getline (&line[l], &linesize[l], fp);
if (linelen[l] == (size_t)(-1))
break;
l = (l + 1) % 2;
if (line[l] != NULL)
fwrite (line[l], 1, linelen[l], stderr);
}
l = (l + 1) % 2;
if (line[l] != NULL
&& !(linelen[l] >= 21
&& memcmp (line[l], "Compilation succeeded", 21) == 0))
fwrite (line[l], 1, linelen[l], stderr);
if (line[0] != NULL)
free (line[0]);
if (line[1] != NULL)
free (line[1]);
fclose (fp);
/* Remove zombie process from process list, and retrieve exit status. */
exitstatus = wait_subprocess (child, "mcs", false, false, true, true);
for (i = 0; i < sources_count; i++)
if (argv[argc - sources_count + i] != sources[i])
freesa (argv[argc - sources_count + i]);
freesa (argv);
return (exitstatus != 0);
}
else
return -1;
}
static int
compile_csharp_using_sscli (const char * const *sources,
unsigned int sources_count,
const char * const *libdirs,
unsigned int libdirs_count,
const char * const *libraries,
unsigned int libraries_count,
const char *output_file, bool output_is_library,
bool optimize, bool debug,
bool verbose)
{
static bool csc_tested;
static bool csc_present;
if (!csc_tested)
{
/* Test for presence of csc:
"csc -help >/dev/null 2>/dev/null \
&& ! { csc -help 2>/dev/null | grep -i chicken > /dev/null; }" */
char *argv[3];
pid_t child;
int fd[1];
int exitstatus;
argv[0] = "csc";
argv[1] = "-help";
argv[2] = NULL;
child = create_pipe_in ("csc", "csc", argv, DEV_NULL, true, true, false,
fd);
csc_present = false;
if (child != -1)
{
/* Read the subprocess output, and test whether it contains the
string "chicken". */
char c[7];
size_t count = 0;
csc_present = true;
while (safe_read (fd[0], &c[count], 1) > 0)
{
if (c[count] >= 'A' && c[count] <= 'Z')
c[count] += 'a' - 'A';
count++;
if (count == 7)
{
if (memcmp (c, "chicken", 7) == 0)
csc_present = false;
c[0] = c[1]; c[1] = c[2]; c[2] = c[3];
c[3] = c[4]; c[4] = c[5]; c[5] = c[6];
count--;
}
}
close (fd[0]);
/* Remove zombie process from process list, and retrieve exit
status. */
exitstatus =
wait_subprocess (child, "csc", false, true, true, false);
if (exitstatus != 0)
csc_present = false;
}
csc_tested = true;
}
if (csc_present)
{
unsigned int argc;
char **argv;
char **argp;
int exitstatus;
unsigned int i;
argc =
1 + 1 + 1 + libdirs_count + libraries_count
+ (optimize ? 1 : 0) + (debug ? 1 : 0) + sources_count;
argv = (char **) xallocsa ((argc + 1) * sizeof (char *));
argp = argv;
*argp++ = "csc";
*argp++ = (output_is_library ? "-target:library" : "-target:exe");
{
char *option = (char *) xallocsa (5 + strlen (output_file) + 1);
memcpy (option, "-out:", 5);
strcpy (option + 5, output_file);
*argp++ = option;
}
for (i = 0; i < libdirs_count; i++)
{
char *option = (char *) xallocsa (5 + strlen (libdirs[i]) + 1);
memcpy (option, "-lib:", 5);
strcpy (option + 5, libdirs[i]);
*argp++ = option;
}
for (i = 0; i < libraries_count; i++)
{
char *option = (char *) xallocsa (11 + strlen (libraries[i]) + 1);
memcpy (option, "-reference:", 11);
strcpy (option + 11, libraries[i]);
*argp++ = option;
}
if (optimize)
*argp++ = "-optimize+";
if (debug)
*argp++ = "-debug+";
for (i = 0; i < sources_count; i++)
{
const char *source_file = sources[i];
if (strlen (source_file) >= 9
&& memcmp (source_file + strlen (source_file) - 9, ".resource",
9) == 0)
{
char *option = (char *) xallocsa (10 + strlen (source_file) + 1);
memcpy (option, "-resource:", 10);
strcpy (option + 10, source_file);
*argp++ = option;
}
else
*argp++ = (char *) source_file;
}
*argp = NULL;
/* Ensure argv length was correctly calculated. */
if (argp - argv != argc)
abort ();
if (verbose)
{
char *command = shell_quote_argv (argv);
printf ("%s\n", command);
free (command);
}
exitstatus = execute ("csc", "csc", argv, false, false, false, false,
true, true);
for (i = 2; i < 3 + libdirs_count + libraries_count; i++)
freesa (argv[i]);
for (i = 0; i < sources_count; i++)
if (argv[argc - sources_count + i] != sources[i])
freesa (argv[argc - sources_count + i]);
freesa (argv);
return (exitstatus != 0);
}
else
return -1;
}
bool
compile_csharp_class (const char * const *sources,
unsigned int sources_count,
const char * const *libdirs,
unsigned int libdirs_count,
const char * const *libraries,
unsigned int libraries_count,
const char *output_file,
bool optimize, bool debug,
bool verbose)
{
bool output_is_library =
(strlen (output_file) >= 4
&& memcmp (output_file + strlen (output_file) - 4, ".dll", 4) == 0);
int result;
/* First try the C# implementation specified through --enable-csharp. */
#if CSHARP_CHOICE_PNET
result = compile_csharp_using_pnet (sources, sources_count,
libdirs, libdirs_count,
libraries, libraries_count,
output_file, output_is_library,
optimize, debug, verbose);
if (result >= 0)
return (bool) result;
#endif
#if CSHARP_CHOICE_MONO
result = compile_csharp_using_mono (sources, sources_count,
libdirs, libdirs_count,
libraries, libraries_count,
output_file, output_is_library,
optimize, debug, verbose);
if (result >= 0)
return (bool) result;
#endif
/* Then try the remaining C# implementations in our standard order. */
#if !CSHARP_CHOICE_PNET
result = compile_csharp_using_pnet (sources, sources_count,
libdirs, libdirs_count,
libraries, libraries_count,
output_file, output_is_library,
optimize, debug, verbose);
if (result >= 0)
return (bool) result;
#endif
#if !CSHARP_CHOICE_MONO
result = compile_csharp_using_mono (sources, sources_count,
libdirs, libdirs_count,
libraries, libraries_count,
output_file, output_is_library,
optimize, debug, verbose);
if (result >= 0)
return (bool) result;
#endif
result = compile_csharp_using_sscli (sources, sources_count,
libdirs, libdirs_count,
libraries, libraries_count,
output_file, output_is_library,
optimize, debug, verbose);
if (result >= 0)
return (bool) result;
error (0, 0, _("C# compiler not found, try installing pnet"));
return true;
}
============================== m4/csharpcomp.m4 ==============================
# csharpcomp.m4 serial 5 (gettext-0.15)
dnl Copyright (C) 2003-2005 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# Prerequisites of csharpcomp.sh.
# Sets HAVE_CSHARPCOMP to nonempty if csharpcomp.sh will work.
AC_DEFUN([gt_CSHARPCOMP],
[
AC_REQUIRE([gt_CSHARP_CHOICE])
AC_MSG_CHECKING([for C[#] compiler])
HAVE_CSHARPCOMP=1
pushdef([AC_MSG_CHECKING],[:])dnl
pushdef([AC_CHECKING],[:])dnl
pushdef([AC_MSG_RESULT],[:])dnl
AC_CHECK_PROG(HAVE_CSCC_IN_PATH, cscc, yes)
AC_CHECK_PROG(HAVE_MCS_IN_PATH, mcs, yes)
AC_CHECK_PROG(HAVE_CSC_IN_PATH, csc, yes)
popdef([AC_MSG_RESULT])dnl
popdef([AC_CHECKING])dnl
popdef([AC_MSG_CHECKING])dnl
for impl in "$CSHARP_CHOICE" pnet mono sscli no; do
case "$impl" in
pnet)
if test -n "$HAVE_CSCC_IN_PATH" \
&& cscc --version >/dev/null 2>/dev/null \
&& (
# See if pnetlib is well installed.
echo 'class ConfTest { static void Main() { } }' > conftest.cs
cscc -o conftest.exe conftest.cs 2>/dev/null
error=$?
rm -f conftest.cs conftest.exe
exit $error
); then
HAVE_CSCC=1
ac_result="cscc"
break
fi
;;
mono)
if test -n "$HAVE_MCS_IN_PATH" \
&& mcs --version >/dev/null 2>/dev/null; then
HAVE_MCS=1
ac_result="mcs"
break
fi
;;
sscli)
if test -n "$HAVE_CSC_IN_PATH" \
&& csc -help >/dev/null 2>/dev/null \
&& { if csc -help 2>/dev/null | grep -i chicken > /dev/null; then
false; else true; fi; }; then
HAVE_CSC=1
ac_result="csc"
break
fi
;;
no)
HAVE_CSHARPCOMP=
ac_result="no"
break
;;
esac
done
AC_MSG_RESULT([$ac_result])
AC_SUBST(HAVE_CSCC)
AC_SUBST(HAVE_MCS)
AC_SUBST(HAVE_CSC)
])
==============================================================================
- [bug-gnulib] Re: new modules for C# interoperability,
Bruno Haible <=