Pure C pre-processor

[Justin Payne]

I'm having a difficult time getting my head around how to use C preprocessor directives in Pure C. In the English documentation, it appears as those the only #pragma option is "warn". I would like to be able to print some info out to the command window, such as __DATE__ and __TIME__ but something like #pragma message __DATE__ doesn't work nor does...

 

#ifdef __PUREC__

printf("Pure C version is %s", __PUREC__);

#endif

 

Eventually, I'd like to see if I can include different header depending on the compiler (PureC vs GCC). For example, in Pure C, v_opnvrk() exists in vdi.h but in GCC, it lives in mt_gem.h. I was thinking of handling that so that when I try to compile in both, I don't have to change the code.

[GroovyBee]

Are you sure __PUREC__ is a string? As a quick test just try :-

 

#if defined(__PUREC__)
ffffff;
#endif

Looks like gibberish and thats because it is . If the compiler complains at the fffff; line you know that __PUREC__ is #defined.

[Justin Payne]

Nope, I don't know for sure. The English document doesn't specify. They also had __TURBOC__ which is supposed to mean the same thing, which is the version of the compiler. I guess it could be an Int or a float or...

So, if it's defined, then what?

Edited July 7, 2014 by Justin Payne

[GroovyBee]

Nope, I don't know for sure. The English document doesn't specify. They also had __TURBOC__ which is supposed to mean the same thing, which is the version of the compiler. I guess it could be an Int or a float or...

So, if it's defined, then what?

Its been a loooooong time since I looked at any "C" on the ST. However, in the PureC package I found online, I could see __PUREC__ used in some of the shipped header files so it should be available in your "C" code.

 

Try doing a printf with a sting and __DATE__ and then look in the executable with a hex editor for the human readable date that your emulator/ST is currently set to. Since its a German utility the date will most likely be in day.month.year format.

[Justin Payne]

Shouldn't I see that date printed put to the output window?

[phoenixdownita]

The issue for now is that you don't know if it is a string.

 

printf("Pure C version is %s", __PUREC__);

 

may just cause a seg fault, but what you could try is

 

printf("Pure C version is %d", __PUREC__ + 1);

 

if __PUREC__ is not an integer then it will fail to compile, so now you know it may be a string, I say may because sometimes you can just define symbols for the sake of the preproc finiding them in #ifdef but they actually do not carry any info per se, not sure if back in the days it was possible, but if it was according to here http://www.cprogramming.com/reference/preprocessor/define.html it should be the "" empty string.

Edited July 9, 2014 by phoenixdownita

[joyfulcoder]

According to the English docs there is no support for "#pragma message" but the following will work for including headers based on the compiler.

#ifdef __PUREC__
	#include <vdi.h>
#else /* assume GCC */
	#include <mt_gem.h>
#endif

[Justin Payne]

 

According to the English docs there is no support for "#pragma message" but the following will work for including headers based on the compiler.

#ifdef __PUREC__
	#include <vdi.h>
#else /* assume GCC */
	#include <mt_gem.h>
#endif

Yes, I think that might work. The printf()'s where throwing errors.

 

Thank!

Edited July 17, 2014 by Justin Payne