ado@ALW.NIH.GOV (Arthur David Olson) (10/08/89)
X Window System Bug Report
xbugs@expo.lcs.mit.edu
VERSION:
R3
CLIENT MACHINE and OPERATING SYSTEM:
Sun 3/60 running SunOS 4.0.3
DISPLAY:
Sun CG4
WINDOW MANAGER:
uwm
AREA:
xclock
SYNOPSIS:
xclock and gcc -O don't mix
DESCRIPTION:
xclock.c contains this code. . .
static Junk()
{
#include <X11/Vendor.h>
WidgetClass junk = vendorShellWidgetClass;
}
. . .to create a reference to "vendorShellWidgetClass" in "xclock.o"
and cause "the linker to include the vendorShell module from Xaw,
rather than the one from Xt". As it happens, gcc optimization is
smart enough to notice that "junk" is never used; it therefore doesn't
generate the desired reference. So the Xaw vendorSehllWidgetClass
doesn't get included; in particular, this means that iconPixmaps
can't be set for xclocks.
REPEAT BY:
Compiling xclock using gcc and the -O option, then using the command
xclock -xrm "*iconPixmap: mensetmanus"
and noting the
X Toolkit Warning: No type converter registered for
'String' to 'Pixmap' conversion.
warning.
SAMPLE FIX:
*** 1.1/xclock.c Sat Oct 7 16:44:21 1989
--- 1.2/xclock.c Sat Oct 7 16:44:21 1989
***************
*** 52,61 ****
/* this silliness causes the linker to include the VendorShell
* module from Xaw, rather than the one from Xt.
*/
! static Junk()
{
#include <X11/Vendor.h>
! WidgetClass junk = vendorShellWidgetClass;
}
#endif
--- 52,61 ----
/* this silliness causes the linker to include the VendorShell
* module from Xaw, rather than the one from Xt.
*/
! static WidgetClass Junk()
{
#include <X11/Vendor.h>
! return vendorShellWidgetClass;
}
#endif
--
To understand Sun's corporate culture look at the vi source code.
Arthur David Olson ado@alw.nih.gov ADO is a trademark of Ampex.