summaryrefslogtreecommitdiff
path: root/Build/source/texk/xdvik/m4/xdvi-linker-multiple-defns.m4
blob: 5c67903a2b98ce48291a875c12dc59974e4b4a65 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
# Autoconf macros for xdvik.
# Copyright (C) 2002 - 2009 Paul Vojta <xdvi-core@lists.sourceforge.net>
# Copyright (C) 2009 Peter Breitenlohner <tex-live@tug.org>
#
# This file is free software; the copyright holders
# give unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# XDVI_LINKER_MULTIPLE_DEFNS
# --------------------------
# Check if the --allow-multiple-definition linker flag is
# available (assuming that we need to use it if it is).
# If it isn't, check if the linker accepts multiple definitions,
# and if it doesn't, don't define LD_ALLOWS_MULTIPLE_DEFINITIONS.

AC_DEFUN([XDVI_LINKER_MULTIPLE_DEFNS],
[AC_CACHE_CHECK([whether linker supports the --allow-multiple-definition flag],
                [xdvi_cv_linker_multiple_defns],
                [xdvi_save_LDFLAGS=$LDFLAGS
                 LDFLAGS="-Xlinker --allow-multiple-definition"
                 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
                                                 [[void foo(void);]])],
                                [xdvi_cv_linker_multiple_defns=yes],
                                [xdvi_cv_linker_multiple_defns=no])
                 LDFLAGS=$xdvi_save_LDFLAGS])

x_linker_options=""
AS_CASE([$xdvi_cv_linker_multiple_defns],
        [yes], [x_linker_options="-Xlinker --allow-multiple-definition"],
        ["by default"], [],
        [AC_MSG_CHECKING([whether linker supports multiple definitions])

    xdvi_ld_save_LIBS=$LIBS
    xdvi_ld_save_CFLAGS=$CFLAGS
    xdvi_ld_save_CPPFLAGS=$CPPFLAGS
    xdvi_ld_save_LDFLAGS=$LDFLAGS

    LIBS="$X_PRE_LIBS -lXt -lX11 $X_EXTRA_LIBS $LIBS"
    CFLAGS="$X_CFLAGS $CFLAGS"
    CPPFLAGS="$X_CFLAGS $CPPFLAGS"
    LDFLAGS="$X_LIBS $LDFLAGS"

    AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <X11/Intrinsic.h>

        XtIntervalId XtAppAddTimeOut(XtAppContext app,
                                     unsigned long interval,
                                     XtTimerCallbackProc proc,
                                     XtPointer closure)
        {
            (void)app; (void)interval; (void)proc; (void)closure;
            return (XtIntervalId)0;
        }
                                    ]],
                                    [[XtIntervalId i = 0; XtRemoveTimeOut(i);]])],
                   [xdvi_cv_linker_multiple_defns="by default"])

    LIBS=$xdvi_ld_save_LIBS
    CFLAGS=$xdvi_ld_save_CFLAGS
    CPPFLAGS=$xdvi_ld_save_CPPFLAGS
    LDFLAGS=$xdvi_ld_save_LDFLAGS

    AC_MSG_RESULT([$xdvi_cv_linker_multiple_defns])])
if test "x$xdvi_cv_linker_multiple_defns" != xno; then
    AC_DEFINE([LD_ALLOWS_MULTIPLE_DEFINITIONS], 1,
              [Define if your system allows multiple definitions of functions.])
else
    AC_MSG_WARN([Linker does not allow multiple definitions.
  *****************************************************************
  * Warning: Your linker does not allow multiple definitions.     *
  * This does not make xdvik unusable, but it will cause problems *
  * with event handling: Some widgets, e.g. the print log window, *
  * tooltips, statusline messages and hyperlink location markers  *
  * will not be updated until the mouse is moved.                 *
  *****************************************************************])
fi
AC_SUBST([x_linker_options])
]) # XDVI_LINKER_MULTIPLE_DEFNS