printing macro's at compile time

KIBO · 06-25-2007, 08:43 AM

Is it possible to print macro's with gcc during compile time?

something like

Code:

#define MACRO 4

#pragma warning MACRO

And that gcc says 4 then during compilation

**Salem** · 06-25-2007, 08:50 AM

What does the manual page tell you?

KIBO · 06-25-2007, 08:57 AM

a lot, but not what im looking for

KIBO · 06-27-2007, 01:00 AM

nobody knows?

**CornedBee** · 06-27-2007, 03:34 AM

Since you're looking for compiler-specific behaviour anyway, just try it out.

KIBO · 06-27-2007, 04:19 AM

jah, of course I tried it but it doesnt work. The original problem why I wanted to do this is solved but I'd still like to know how this is possible, could be handy next time.
gcc docs say lots of things about pragma's, but nothing about printing macro's

**CornedBee** · 06-27-2007, 04:48 AM

What does it print?

Ideswa · 06-27-2007, 06:00 AM

You can add macro's during compiling using this:

Code:

gcc source.c -DMACRO=4

This is the same as:

Code:

#define MACRO 4

It's not the solution to your question, but you can "view" your macro's during the compiling.

dwks · 06-27-2007, 01:24 PM

You can use a sort of if-else construct.

Code:

#define DEBUG 1

#if DEBUG == 1
    #pragma warning Debug mode on.
#elif DEBUG == 0
    #pragma warning Release mode on.
#else
    #pragma warning Invalid DEBUG macro.
#endif

But I'm sure you've already thought of that.

KIBO · 06-28-2007, 08:11 AM

all I get is

c:\bla.c(245): warning: ignoring #pragma warning xxx

06-25-2007, 08:43 AM	#1
KIBO Registered User Join Date: Jan 2007 Posts: 223	printing macro's at compile time Is it possible to print macro's with gcc during compile time? something like Code: #define MACRO 4 #pragma warning MACRO And that gcc says 4 then during compilation
KIBO is offline

06-25-2007, 08:50 AM	#2
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,700	What does the manual page tell you? __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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06-25-2007, 08:57 AM	#3
KIBO Registered User Join Date: Jan 2007 Posts: 223	a lot, but not what im looking for
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06-27-2007, 01:00 AM	#4
KIBO Registered User Join Date: Jan 2007 Posts: 223	nobody knows?
KIBO is offline

06-27-2007, 03:34 AM	#5
CornedBee Cat without Hat Join Date: Apr 2003 Posts: 8,492	Since you're looking for compiler-specific behaviour anyway, just try it out. __________________ All the buzzt! CornedBee "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code." - Flon's Law
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06-27-2007, 04:19 AM	#6
KIBO Registered User Join Date: Jan 2007 Posts: 223	jah, of course I tried it but it doesnt work. The original problem why I wanted to do this is solved but I'd still like to know how this is possible, could be handy next time. gcc docs say lots of things about pragma's, but nothing about printing macro's
KIBO is offline

06-27-2007, 04:48 AM	#7
CornedBee Cat without Hat Join Date: Apr 2003 Posts: 8,492	What does it print? __________________ All the buzzt! CornedBee "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code." - Flon's Law
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06-27-2007, 06:00 AM	#8
Ideswa C / C++ Join Date: Jan 2006 Location: The Netherlands Posts: 312	You can add macro's during compiling using this: Code: gcc source.c -DMACRO=4 This is the same as: Code: #define MACRO 4 It's not the solution to your question, but you can "view" your macro's during the compiling. __________________ Operating Systems: - Ubuntu 9.04 - XP Compiler: gcc
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06-27-2007, 01:24 PM	#9
dwks Frequently Quite Prolix Join Date: Apr 2005 Location: Canada Posts: 7,698	You can use a sort of if-else construct. Code: #define DEBUG 1 #if DEBUG == 1 #pragma warning Debug mode on. #elif DEBUG == 0 #pragma warning Release mode on. #else #pragma warning Invalid DEBUG macro. #endif But I'm sure you've already thought of that. __________________ dwk Seek and ye shall find. quaere et invenies. "Simplicity does not precede complexity, but follows it." -- Alan Perlis "Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra "The only real mistake is the one from which we learn nothing." -- John Powell Other boards: DaniWeb, TPS Unofficial Wiki FAQ: cpwiki.sf.net My website: http://dwks.theprogrammingsite.com/ Projects: codeform, xuni, atlantis, nort, etc.
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06-28-2007, 08:11 AM	#10
KIBO Registered User Join Date: Jan 2007 Posts: 223	all I get is c:\bla.c(245): warning: ignoring #pragma warning xxx
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