What is translation unit

What is translation unit

[mahmoodn]

Hi,
What is translation unit and how can I determine how many translation unit
my code have? :confused:

Thanks
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Re: What is translation unit

[John Love-Jensen]

Hi mahmoodn,

> What is translation unit and how can I determine how many translation unit
> my code have? :confused:

Let's say you have three source code files, foo.cpp, bar.cpp and baz.cpp.

Here are the three translation units, which translate from the source file
to the object file.

g++ -c foo.cpp -o foo.o
g++ -c bar.cpp -o bar.o
g++ -c baz.cpp -o baz.o


When linking the object files together, that process is not a translation
unit.

g++ foo.o bar.o baz.o -o quux

HTH,
--Eljay

Re: What is translation unit

[mahmoodn]

Hello,

Sorry, I did not fully understand. I think mean that number of translation
units = number of cpp files.
Right?


John (Eljay) Love-Jensen wrote:
> 
> Hi mahmoodn,
> 
>> What is translation unit and how can I determine how many translation
>> unit
>> my code have? :confused:
> 
> Let's say you have three source code files, foo.cpp, bar.cpp and baz.cpp.
> 
> Here are the three translation units, which translate from the source file
> to the object file.
> 
> g++ -c foo.cpp -o foo.o
> g++ -c bar.cpp -o bar.o
> g++ -c baz.cpp -o baz.o
> 
> 
> When linking the object files together, that process is not a translation
> unit.
> 
> g++ foo.o bar.o baz.o -o quux
> 
> HTH,
> --Eljay
> 
> 
> 

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Re: What is translation unit

[John Love-Jensen]

Hi mahmoodn,

> Sorry, I did not fully understand. I think mean that number of translation
> units = number of cpp files.
> Right?

More-or-less.

If a Fred.cpp does a #include "Barney.cpp", then Barney.cpp will be in the
same translation unit as Fred.cpp.

If Wilma.cpp is not compiled, then there is no Wilma translation unit.

Sincerely,
--Eljay

Re: What is translation unit

[Robert Kiesling]

Dear confused,

> > Sorry, I did not fully understand. I think mean that number of translation
> > units = number of cpp files.
> > Right?
> 
> More-or-less.
> 
> If a Fred.cpp does a #include "Barney.cpp", then Barney.cpp will be in the
> same translation unit as Fred.cpp.
> 
> If Wilma.cpp is not compiled, then there is no Wilma translation unit.
> 
> Sincerely,
> --Eljay
> 

IIRC correctly, a translation unit is the input that goes through 
the preprocess-parse-codegeneration cycle.

That means all of the cpp inputs of

  g++ foo.cpp bar.cpp baz.cpp -o foobarbaz.o

are translation units.

Regards,

Robert

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Re: What is translation unit

[mahmoodn]

Thanks, 
I understood...


Robert Kiesling wrote:
> 
> Dear confused,
> 
>> > Sorry, I did not fully understand. I think mean that number of
>> translation
>> > units = number of cpp files.
>> > Right?
>> 
>> More-or-less.
>> 
>> If a Fred.cpp does a #include "Barney.cpp", then Barney.cpp will be in
>> the
>> same translation unit as Fred.cpp.
>> 
>> If Wilma.cpp is not compiled, then there is no Wilma translation unit.
>> 
>> Sincerely,
>> --Eljay
>> 
> 
> IIRC correctly, a translation unit is the input that goes through 
> the preprocess-parse-codegeneration cycle.
> 
> That means all of the cpp inputs of
> 
>   g++ foo.cpp bar.cpp baz.cpp -o foobarbaz.o
> 
> are translation units.
> 
> Regards,
> 
> Robert
> 
> -- 
> Ctalk Home Page: http://www.ctalklang.org/
> 
> 
> 

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