[gst-devel] [gst-embedded] gstreamer segfault on ARM

[Zhao Liang-E3423C]

Another walkaround is changing configure.ac, disable printf extension support.

Best Regards
Zhao Liang

-----Original Message-----
From: gstreamer-embedded-bounces at lists.sourceforge.net [mailto:gstreamer-embedded-bounces at lists.sourceforge.net] On Behalf Of Liu, Bin
Sent: Monday, June 23, 2008 10:42 PM
To: gstreamer-embedded at lists.sourceforge.net; gstreamer-devel at lists.sourceforge.net
Subject: Re: [gst-embedded] [gst-devel] gstreamer segfault on ARM

I had the same issue. I manually modified gstconfig.h to make it work. Glib is out of my control.

-----Original Message-----
From: gstreamer-devel-bounces at lists.sourceforge.net [mailto:gstreamer-devel-bounces at lists.sourceforge.net] On Behalf Of Zhao Liang-E3423C
Sent: Monday, June 23, 2008 2:34 AM
To: Shi Ling-w20230; Bernard Blackham; gstreamer-embedded at lists.sourceforge.net; gstreamer-devel at lists.sourceforge.net
Subject: Re: [gst-devel] [gst-embedded] gstreamer segfault on ARM

Yes, It is same issue with us, but we are using another solution, I can try his fix .


Best Regards
Zhao Liang 赵 亮
Tel:86-10-84733698
No.1 Wang Jing East Road, Chao Yang District, Beijing, China 100102
北京市朝阳区望京东路1号, 100102

-----Original Message-----
From: Shi Ling-w20230
Sent: Monday, June 23, 2008 3:29 PM
To: Bernard Blackham; gstreamer-embedded at lists.sourceforge.net; gstreamer-devel at lists.sourceforge.net; Zhao Liang-E3423C
Subject: RE: [gst-devel] [gst-embedded] gstreamer segfault on ARM

Zhao Liang,
I remember we meet the same issue before. Could you check?




Shi Ling
Tel:86-10-84733539
Motorola (China) Technology Ltd.
No.1 Wang Jing East Road, Chao Yang District, 100102 Beijing

-----Original Message-----
From: gstreamer-devel-bounces at lists.sourceforge.net [mailto:gstreamer-devel-bounces at lists.sourceforge.net] On Behalf Of Bernard Blackham
Sent: Friday, June 20, 2008 3:30 PM
To: gstreamer-embedded at lists.sourceforge.net; gstreamer-devel at lists.sourceforge.net
Subject: Re: [gst-devel] [gst-embedded] gstreamer segfault on ARM

[Taking to gst-devel]

Bernard Blackham wrote:
> Running a rather simple program:
>
>   #include <gst/gst.h>
>   int main() {
>     gst_init(0, NULL);
>     g_pipeline_new("pipeline");
>     return 0;
>   }
>
> with GST_DEBUG=4 causes the program to segfault when it goes to print 
> out one of its trace messages.

I tracked down the cause of this to an incompatibility with my build of glib. When cross-compiling glib, it decided to not like glibc's printf (because it tried running some printf tests and failed, because it was cross-compiling), and thus went and used its own printf implementation.

Gstreamer was not aware of this decision in the glib build though, so it happily went ahead and used glib assuming it had a glibc printf that could support printf extensions (that it uses to format %P in strings).

Rebuilding glib with the right configure cache settings (below) solved the gstreamer crash.

  glib_cv_long_long_format=ll
  ac_cv_func_printf_unix98=yes
  ac_cv_func_vsnprintf_c99=yes

So this solved the problem, but I'm wondering if there should be a better way for gstreamer to detect if it is safe to use %P or not: not only does glibc need to provide it, but glib needs to be using it too.
Or is the fact that glibc provides it enough proof that glib should be using it and anything else is a broken setup like mine was?

TIA,
Bernard.


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