Re: [GRASS-dev] Vect_rewrite_line using off_t as line id

[Radim Blazek]

On Fri, Sep 18, 2015 at 11:08 AM, Martin Landa  wrote:
> Hi,
>
> 2015-09-18 10:29 GMT+02:00 Glynn Clements :
>
>> Ultimately, the only place where the actual off_t size is "known" is
>> in compiled code. It might be worth adding this information to the
>> output of g.version.
>
> I added this info to g.version in r66256.
>
> $ g.version -g
> version=7.1.svn
> date=2015
> revision=66133
> build_date=2015-09-18
> build_platform=x86_64-unknown-linux-gnu
> build_off_t_size=8   <---

Thanks, but the g.version is a bit difficult to be run from in CMAKE
script. Could be the output of g.version written to a header file?
E.g. run  g.version -g > include/build_version.h when manual pages are
generated?

Radim

> If it's worth I can backport to relbr70. Martin
>
> --
> Martin Landa
> http://geo.fsv.cvut.cz/gwiki/Landa
> http://gismentors.cz/mentors/landa
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Re: [GRASS-dev] Vect_rewrite_line using off_t as line id

[Glynn Clements]

Radim Blazek wrote:

> Can I get from GRASS includes the real type of off_t which was used
> when GRASS was compiled?

Not easily. Or reliably. You could use the compiler switches from
Platform.make and include  in the hope that it's
enough to get the same off_t that GRASS used.

Ultimately, the only place where the actual off_t size is "known" is
in compiled code. It might be worth adding this information to the
output of g.version.

-- 
Glynn Clements 
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[GRASS-dev] Vect_rewrite_line using off_t as line id

[Radim Blazek]

Hi,

I see that in r55582 was changed the type of line parameter in
Vect_rewrite_line, Vect_restore_line and Vect_delete_line from int to
off_t. It makes it impossible to use those functions from an
application compiled with a compiler which has different off_t size,
which is the case for QGIS / OSGeo4W (also some Ubuntu builds). It
seems that a single function is used for two different purposes,
change a line in file by offset on level 1 and change a line by line
id on level 2. Unfortunately V2_*_line functions were also changed to
off_t.

Do you know about any workaround?

I can only imagine a dirty hack like (not sure if it would work):

typedef my_off_t  
typedef int Vect_delete_line_type(struct Map_info *, my_off_t);
Vect_delete_line_type *Vect_delete_line_pointer = Vect_delete_line;
Vect_delete_line_pointer(map, line);

Can I get from GRASS includes the real type of off_t which was used
when GRASS was compiled?

Radim
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