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On 7/23/2011 1:24 PM, Martin Gregorie wrote:
> On Sat, 23 Jul 2011 11:19:19 -0400, Arne Vajhøj wrote:
>
>> On 7/23/2011 9:19 AM, Martin Gregorie wrote:
>
>>> The last C compilers I remember that had separate preprocessors were
>>> K&R, so were very old. In these, cc was effectively a shell that
>>> invoked the preprocessor, the C --> assembler translator, the
>>> assembler and the linker in turn. Actually, I'm still using one - the
>>> standard OS/9 v2.4 C compiler, which dates from 1992 and runs on 68xxx
>>> hardware.
>>>
>>> I don't remember any ANSI C compilers I've used being structured this
>>> way: certainly I've not seen any version of the GNU compiler or its
>>> derivatives that aren't a monolithic chunk that includes all
>>> compilation stages except the linker. AFAICR this also applied to the
>>> Borland compilers.
>>>
>>> So, if that's really what you want, go and find a old K&R compiler or
>>> its source.
>>
>> GCC still has a separate executable for preprocessing!
>>
>> The driver gcc or g++ calls cpp, cc1 or cc1plus, as and ld.
>>
> Fair cop, guv.
>
> I looked at /usr/bin, thought the preprocessor was called cpre so didn't
> find it and glanced through 'man gcc' but didn't find anything describing
> the compiler structure. The fact that the options are subdivided onto
> compilation stages doesn't necessarily say anything about the compiler
> physical structure, and as gcc is fairly big, I assumed....

It is cpp (or gcc-cpp).

Not a very good name - most would assume that cpp=c plus plus.

But then most people would call it via the general compiler driver, so
it does not matter much.

Arne

On Sat, 23 Jul 2011 19:22:13 -0400, Arne Vajhøj wrote:

> It is cpp (or gcc-cpp).
>
> Not a very good name - most would assume that cpp=c plus plus.
>
> But then most people would call it via the general compiler driver, so
> it does not matter much.
>
I looked for cpre since I thought that was what the preprocessor was
called in Microware's K&R compiler. I just ran the compiler up to check
(its been a long time since I compiled C on that machine) and found it
too calls it cpp. A visible difference between gcc and the OS/9 compiler
(cc) is that the latter displays the name and arguments of each compiler
phase as it is executed: its quite a nice thing to do on a slow machine
(25 MHz 68020).


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