Pango related problem.

[luca <luca cappa tiscali it>]

Hello
I forward here a message I originally sent over the gtk-app-devel list. 
In few words, the problem is that if i link my application with 
vtkfreetype.so library before the freetype.so one, i will get an error 
(as soon any gtk label appears for example), but if i link firstly to 
freetype.so (i.e. -lfreetype before -lvtkfreetype) it will run properly. 
My question is if in the first case Pango will use vtkfreetype  library 
and why :)

Thanks,
Luca



========================================================

Hello   ;)

Luca Cappa wrote:

> Hello all,
>
> I have a problem with my application, that when it is started it just 
> output these lines:
>
> (x:18680): Pango-WARNING **: Cannot open font file for font Bitstream 
> Vera Sans 10
>
> (x:18680): Pango-WARNING **: Cannot open fallback font, nothing to do
>
> and then it exit.
>
> Anyone has a clue?
I think I resolved my issue: in fact I discovered that if I link my 
application with vtkfreetype.so (the freetype library that comes with 
the www.VTK.org library),
I have the problem I have explained in the original email. I reproduced 
the problem with a simple test case, one linking to vtkfreetype.so 
before freetype.so (i.e. -lvtkfreetype and then -lfreetype), and the 
other one linking firstly to freetype.so instead.
I ran 'ldd' on the two executables generated in the two cases:

luca c65:~/tmp/vtkfreetype$ ldd ./test_case | grep free
      libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0xb6236000)
      libvtkfreetype.so => /usr/local/lib/vtk/libvtkfreetype.so 
(0xb61e9000)

luca c65:~/tmp/vtkfreetype$ ldd ./test_case | grep free
      libvtkfreetype.so => /usr/local/lib/vtk/libvtkfreetype.so 
(0xb61b7000)
      libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0xb56c3000)

As you can se the only difference is the order of the shared objects. I 
wonder why the order matters, and if Pango uses the vtkfreetype library 
in the first case (which reproduces the original problem) and in the 
second case Pango uses instead the freetype.so and then application runs 
properly. Anyone could enlight this for me?

Many thanks,
Luca

> Here some packages the application is using follow:
>
> libgtk2.0-0    2.6.10-2       The GTK+ graphical user interface library
> libgtkmm-2.4-1 2.6.2-1.1      C++ wrappers for GTK+ 2.4 (shared
> libpango1.0-0  1.8.2-3        Layout and rendering of internationalized
>
>
> I attach here the strace of the application:
>
> fstat64(4, {st_mode=S_IFREG|0644, st_size=6512, ...}) = 0
> old_mmap(NULL, 9472, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 
> 4, 0) = 0xa1a4a000
> old_mmap(0xa1a4c000, 4096, PROT_READ|PROT_WRITE, 
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x1000) = 0xa1a4c000
> close(4)                                = 0
> open("/usr/share/locale/en_IT/LC_MESSAGES/libc.mo", O_RDONLY) = -1 
> ENOENT (No such file or directory)
> open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT 
> (No such file or directory)
> open("/usr/share/locale/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 
> ENOENT (No such file or directory)
> open("/usr/share/locale/en_GB/LC_MESSAGES/libc.mo", O_RDONLY) = 4
> fstat64(4, {st_mode=S_IFREG|0644, st_size=1474, ...}) = 0
> mmap2(NULL, 1474, PROT_READ, MAP_PRIVATE, 4, 0) = 0xa1a49000
> close(4)                                = 0
> open("/usr/share/fonts/truetype/ttf-bitstream-vera/Vera.ttf", 
> O_RDONLY) = 4
> fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
> fstat64(4, {st_mode=S_IFREG|0644, st_size=65932, ...}) = 0
> mmap2(NULL, 65932, PROT_READ, MAP_PRIVATE, 4, 0) = 0xa1a38000
> close(4)                                = 0
> munmap(0xa1a38000, 65932)               = 0
> write(2, "\n(x:18788): Pango-WARNING **"..., 88) = 88
> open("/usr/share/fonts/truetype/ttf-bitstream-vera/Vera.ttf", 
> O_RDONLY) = 4
> fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
> fstat64(4, {st_mode=S_IFREG|0644, st_size=65932, ...}) = 0
> mmap2(NULL, 65932, PROT_READ, MAP_PRIVATE, 4, 0) = 0xa1a38000
> close(4)                                = 0
> munmap(0xa1a38000, 65932)               = 0
> write(2, "\n(x:18788): Pango-WARNING **"..., 75) = 75
> munmap(0xb6874000, 266240)              = 0
> munmap(0xb68b5000, 372736)              = 0
> munmap(0xb7fe7000, 8192)                = 0
> munmap(0xb6873000, 4096)                = 0
> exit_group(1)                           = ?
>
>
> Greetings,
> Luca
>
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