How to override Macros on command line?

[Steve]

Is it possible to override a #define in a source file with a gcc macro?

Obviously gcc -DMACRO=Something won't work when it is already defined in the
source file.

I'm trying to avoid patching the source file tree every time a new version is
issued. Unfortunately the #define moves around between files with different
versions. So I'd have to search for the file with the #define before
patching it and that's a little ugly.

Any ideas?
--
Steve

[André Pönitz]

Steve <nos...@nospam.demon.co.uk> wrote:
> Is it possible to override a #define in a source file with a gcc macro?

Not without touching the source.

> I'm trying to avoid patching the source file tree every time a new version is
> issued. Unfortunately the #define moves around between files with different
> versions. So I'd have to search for the file with the #define before
> patching it and that's a little ugly.

The #define in the source should be wrapped into something like

#ifndef FOO
#define FOO 2.1
#endif

Then you can use -DFOO=2.3 to "override" it.

Andre'

--
Those who desire to give up Freedom in order to gain Security,
will not have, nor do they deserve, either one. (T. Jefferson)

[Steve]

On 28 Jan 2003 12:53:23 GMT, André Pönitz <poe...@gmx.net> wrote:

>Steve <nos...@nospam.demon.co.uk> wrote:
>> Is it possible to override a #define in a source file with a gcc macro?
>
>Not without touching the source.
>
>> I'm trying to avoid patching the source file tree every time a new version is
>> issued. Unfortunately the #define moves around between files with different
>> versions. So I'd have to search for the file with the #define before
>> patching it and that's a little ugly.
>
>The #define in the source should be wrapped into something like
>
>#ifndef FOO
>#define FOO 2.1
>#endif
>
>Then you can use -DFOO=2.3 to "override" it.
>
>Andre'

OK - shame. I don't have control of the source, so a bash script it is.
--
Steve