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dnl ### Check if the --allow-multiple-definition linker flag is
dnl ### available (assuming that we need to use it if it is).
dnl ### If it isn't, check if the linker accepts multiple definitions,
dnl ### 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"
x_linker_options=""
[AC_TRY_LINK(
[#include <stdio.h>
],
[void foo(void);
],
[xdvi_cv_linker_multiple_defns=yes], [xdvi_cv_linker_multiple_defns=no]
)]
)
if test $xdvi_cv_linker_multiple_defns = yes; then
x_linker_options="-Xlinker --allow-multiple-definition"
LDFLAGS="$xdvi_save_LDFLAGS"
AC_DEFINE([LD_ALLOWS_MULTIPLE_DEFINITIONS], 1,
[Define if your system allows multiple definitions of functions.])
else
LDFLAGS="$xdvi_save_LDFLAGS"
xdvi_ld_save_LIBS="$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_MSG_CHECKING([whether linker supports multiple definitions by default])
AC_TRY_LINK(
[#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=yes], [xdvi_cv_linker_multiple_defns=no]
)
if test $xdvi_cv_linker_multiple_defns = yes; then
AC_MSG_RESULT(yes)
AC_DEFINE([LD_ALLOWS_MULTIPLE_DEFINITIONS], 1)
else
AC_MSG_RESULT(no)
AC_MSG_WARN([Linker does not allow multiple definitions.
*****************************************************************
* Warning: Your linker does not allow multiple definitions. *
* This does not make xdvik unusable, but it will cause problems *
* with event handling: Some widgets, e.g. the print log window, *
* tooltips, statusline messages and hyperlink location markers *
* will not be updated until the mouse is moved. *
*****************************************************************])
fi
LIBS="$xdvi_ld_save_LIBS"
CFLAGS="$xdvi_ld_save_CFLAGS"
CPPFLAGS="$xdvi_ld_save_CPPFLAGS"
LDFLAGS="$xdvi_ld_save_LDFLAGS"
fi
AC_SUBST(x_linker_options)])
|
