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vh4x0r
n00b
Joined: 11 May 2009
Posts: 37
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 Posted: Tue Nov 16, 2010 9:16 pm Post subject: gcc-4.5.1 and Xlib issues |
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I was working on some code using Xlib, and I noticed a weird issue  , which hadn't occurred until I recompiled my entire system using gcc-4.5.1. I wrote this code :
| Code: | #include <X11/Xlib.h>
int main ()
{
Display * d = XOpenDisplay (NULL);
int s = DefaultScreen (d);
Window w = XCreateSimpleWindow (d, RootWindow (d, s), 400, 200, 400, 300, 1,
BlackPixel (d, s), WhitePixel (d, s));
XEvent e;
GC arc_gc = XCreateGC (d, w, 0, 0);
XSetLineAttributes (d, arc_gc, 1, LineSolid, CapNotLast, JoinMiter);
XSelectInput (d, w, ExposureMask | KeyPressMask);
XMapWindow (d, w);
while (1)
{
XNextEvent (d, &e);
if (e.type == Expose)
XDrawArc (d, w, arc_gc, 50, 50, 100, 100, 0, 360*64);
if (e.type == KeyPress)
break;
}
XCloseDisplay (d);
return 0;
}
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and the result I got was an arc with lots of stray lines  . Curiously this doesn't occur when I don't set the thickness with XSetLineAttributes (). I'm pretty sure this didn't occur with gcc 4.4. Here are my package versions.
| Code: | [I] x11-libs/libX11
Available versions: 1.3.4 (~)1.3.6 {doc ipv6 static-libs test +xcb}
Installed versions: 1.3.6(13:13:31 10/12/10)(xcb -doc -ipv6 -static-libs -test)
Homepage: http://xorg.freedesktop.org/
Description: X.Org X11 library
[I] x11-base/xorg-server
Available versions: 1.7.6 1.7.7-r1 (~)1.8.2 [m](~)1.9.2 [m](~)1.9.2.901 {debug dmx doc hal ipv6 kdrive minimal nptl sdl static-libs tslib +udev xorg}
Installed versions: 1.8.2(06:19:47 10/15/10)(kdrive nptl udev xorg -dmx -doc -hal -ipv6 -minimal -static-libs -tslib)
Homepage: http://xorg.freedesktop.org/
Description: X.Org X servers
[U] sys-devel/gcc
Available versions:
(2.95) *2.95.3-r9 ~*2.95.3-r10!s
(3.1) *3.1.1-r2
(3.2) **3.2.2!s *3.2.3-r4
(3.3) (~)3.3.6-r1!s
(3.4) 3.4.6-r2!s
(4.0) ~*4.0.4!s
(4.1) 4.1.2!s
(4.2) (~)4.2.4-r1!s
(4.3) (~)4.3.3-r2!s 4.3.4!s (~)4.3.5!s
(4.4) (~)4.4.2!s 4.4.3-r2!s (~)4.4.3-r3!s (~)4.4.4-r1!s 4.4.4-r2!s (~)4.4.5!s
(4.5) {M}(~)4.5.1!s
{altivec bootstrap boundschecking build d doc fixed-point fortran gcj graphite gtk hardened ip28 ip32r10k java libffi lto mudflap multilib multislot n32 n64 nls nocxx nopie nossp nptl objc objc++ objc-gc openmp static test vanilla}
Installed versions: 4.4.3-r2(4.4)!s(16:37:03 10/07/10)(fortran mudflap multilib nls nptl openmp -altivec -bootstrap -build -doc -fixed-point -gcj -graphite -gtk -hardened -libffi -multislot -n32 -n64 -nocxx -objc -objc++ -objc-gc -test -vanilla) 4.5.1(4.5)!s(22:26:28 10/12/10)(doc fortran gcj graphite gtk lto mudflap multilib nls nptl openmp -altivec -bootstrap -build -fixed-point -hardened -libffi -multislot -n32 -n64 -nocxx -nopie -nossp -objc -objc++ -objc-gc -test -vanilla)
Homepage: http://gcc.gnu.org/
Description: The GNU Compiler Collection
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roarinelk
Guru
Joined: 04 Mar 2004
Posts: 520
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| Posted: Wed Nov 17, 2010 2:15 pm Post subject: |
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Works for me, both 4.4.5 and 4.5.1 draw a window with a circle inside.
Maybe it's a gfx driver and/or libX11 issue? (I use x11 git with the nvidia blob). |
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vh4x0r
n00b
Joined: 11 May 2009
Posts: 37
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| Posted: Wed Nov 17, 2010 2:57 pm Post subject: |
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I have an integrated intel IGP (Intel HD graphics) with the Core i3 processor and xf86-video-intel-2.13.0. This graphics chip is relatively new  , so that could be the problem too.
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xpace
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Joined: 20 Feb 2010
Posts: 5
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vh4x0r
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Joined: 11 May 2009
Posts: 37
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| Posted: Sun Feb 20, 2011 2:01 pm Post subject: |
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No, it still occurs with libX11-1.4.1, gcc-4.5.2, xf86-video-intel-2.14.0 and xorg-server-1.9.4 
The only way to fix my code was to not change line attributes ...
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xpace
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