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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: Small Device C Compiler 3.6.0 released
Date: Sat, 18 Jun 2016 11:47:34 -0700
Organization: None to speak of
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Keith Thompson <kst-u@mib.org> writes:
> Malcolm McLean <malcolm.mclean5@btinternet.com> writes:
>> On Tuesday, June 14, 2016 at 4:37:30 PM UTC+1, Keith Thompson wrote:
>>> Malcolm McLean <malcolm.mclean5@btinternet.com> writes:
>>> [...]
>>> > Every line of source is within the program, which is the first level of
>>> > scope.
>>> > Not all source is within a "translation unit" and you can play silly hacks
>>> > with headers that access file scope variables. But most is. You have
>>> > several source files per program. So that's nested, but only to one
>>> > level.
>>> [...]
>>> 
>>> Do you have an example of source that is not within a translation unit?
>>> 
>> /* fred.h */
>>
>> sillyhack = verysilly;
>>
>>
>> /* jim.c */
>>
>> void foo()
>> {
>>    double sillyhack;
>>    double verysilly = 42;
>>
>> #include "fred.h"
>>
>>   printf("Silly hack was, heh heh heh %g\n", sillyhack);
>> }
>>
>> /* bert.c */
>>
>> void bar()
>> {
>>    const char *sillyhack;
>>    const char *verysilly = "wabbadoo";
>>
>> #include "fred.h"
>>
>>    printf("%s\n", sillyhack);
>>
>> }
>
> Ok.
>
> Do you have an example of source that is not within a translation unit?
>
> If that was intended to be an example, what source is not within a
> translation unit?
>
> N1570 5.1.1.1:
>
>     A source file together with all the headers and source files
>     included via the preprocessing directive #include is known as a
>     *preprocessing translation unit*. After preprocessing, a
>     preprocessing translation unit is called a *translation unit*.
>
> When jim.c is compiled, the contents of fred.h are part of the resulting
> translation unit.  When bert.c is compiled, the contents of fred.h are
> again part of the resulting (different) translation unit.

I presume from your lack of response that you've conceded that there is
no such example.  Feel free to correct me (with a valid example) if that
presumption is incorrect.

(I suppose source code that's never compiled isn't part of any
translation unit, but I don't think that's what you meant.)

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"