Re: Some observations building gnuplot for win by gcc-4.9.2 (MinGW64)

[Ethan A M. <sf...@us...>]

On Tuesday, 03 March, 2015 16:16:01 Tatsuro MATSUOKA wrote:
> Hello
> 
> I have tried to update gcc for windows build of gnuplot from ver. 4.9.0 to 4.9.2.
> Some observations happened for both 64 bit and 32 bit build.
> 
> 
> Complier gcc-4.9.2-2 from MinGW-64 project
> 64 bit : exception:seh, thread:win32 
> 32 bit : exception:dwarf2, thread:win32 
> 
> Good point
> 
>  I can built gd-2.1.1 flawlessly for both 64 bit and 32 bit platform.
> 
> 
> Troubles ?
> **********
> 64 bit
> **********
[snip]

> 32 bit
> ******
> gnuplot crashes by segmentation fault when one use cairo based terminals.
> 
> Segmentation fault : g_utf8_validate gutf8.c:1634 on MinGW-64 32 bit gcc-4.9.2
> 
> I have met a  Segmentation fault at using gnuplot-5.1 built by myself on windows.
> The Segmentation fault seems to be related with the cairo based terminals.
> (The cairo based terminals use libglib.)
> 
> Compiler gcc-4.9.2 (MinGW-w64 32bit. dwarf, win32 thread).
> Glib version : 2.42.1. Build from source.
> 
> gdb message:
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x6862318f in g_utf8_validate (str=0x2888a68 "-1", max_len=-1, end=0xffffffff)
>     at ../../glib-2.42.1/glib/gutf8.c:1634
> 1634        *end = p;
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x6862318f in g_utf8_validate (str=0xb28a68 "-1", max_len=-1, end=0xffffffff)
>     at ../../glib-2.42.1/glib/gutf8.c:1634
> 1634        *end = p;
> 
> 
> Perhaps this is a bug of glib (2.42.1 and 2.33.14).
> 
> I have filed the issue to  the bug tracker of Gnome.
>  
> https://bugzilla.gnome.org/show_bug.cgi?id=745485
> 
> At this moment, I abandon the complier update. However, is the trouble 2 for 64 bit case not a issue of gnuplot code?

That is possible.
Can you provide a more complete trace of the segfault that
shows where in the gnuplot code this failure happened?

	Ethan


 
> Regards
> 
> Tatsuro