Digital Mars - c++ - Eliminating unused data

↑ ↓ ← → Nicolay Haustov <Nicolay_member pathlink.com> writes:

Are there any options that will cause dmc not to generate string constants when
they are not used? In my project,  I have lots of debugging code,  which is all 
gone for release builds,  but debugging messages are still present in final
executable. I.e. I want "Hello, world." not to be generated from the following
program(simplified).

#ifdef LOGGING
void log(const char *s)
{
printf("%s\n");
}
#else
inline void log(const char *s)
{
}
#endif

int main()
{
log("Hello, world");
return 0;
}

Aug 15 2003

↑ ↓ ← → "Winfried Mevenkamp" <gemi_gmbh t-online.de> writes:

Try using a macro like this

#define LOGGING 1

#ifdef LOGGING
#define TRACE printf
#else
#define TRACE 1 ? (void)0 : printf
#endif

int main(int argc, char* argv[])
{
   for (int n = 0; n < argc; n++)
      TRACE("Hello, world, argv[%d] = %s\n", n, argv[n]);

   return 0;
}

HTH
Winfried

Aug 15 2003

↑ ↓ ← → Nicolay Haustov <Nicolay_member pathlink.com> writes:

In article <bhisbv$2o3i$1 digitaldaemon.com>, Winfried Mevenkamp says...

Try using a macro like this


Thanks for the response.
As always, real world case is more complex. I need to log different data,
including my own classes.  I am using C++ operator <<,  something like this,
again simplified.  Using macro here would mean uglifying code,  but looks like I
will have to do it...

class logger {};

class A {};

#ifdef LOGGING
logger& operator<<(logger& log, const char *s)
{
printf("%s\n", s);
return log;
}

logger& operator<<(logger& log, const A& a)
{
printf("A\n");
return log;
}
#else
inline logger& operator<<(logger& log, const char *s)
{
return log;
}
inline logger& operator<<(logger& log, const A& a)
{
return log;       
}
#endif

int main()
{
logger log;
log << "Hello, world!" << A();
return 0;
}

Aug 18 2003

↑ ↓ ← → Ilya Minkov <midiclub 8ung.at> writes:

You may want to look up function-level linkage in the manual.

Nicolay Haustov wrote:
 Are there any options that will cause dmc not to generate string constants when
 they are not used? In my project,  I have lots of debugging code,  which is
all 
 gone for release builds,  but debugging messages are still present in final
 executable. I.e. I want "Hello, world." not to be generated from the following
 program(simplified).
 
 #ifdef LOGGING
 void log(const char *s)
 {
 printf("%s\n");
 }
 #else
 inline void log(const char *s)
 {
 }
 #endif
 
 int main()
 {
 log("Hello, world");
 return 0;
 }

Aug 15 2003

↑ ↓ ← → Nicolay Haustov <Nicolay_member pathlink.com> writes:

In article <bhj0tt$2s1a$2 digitaldaemon.com>, Ilya Minkov says...

You may want to look up function-level linkage in the manual.


Thanks for response.
I had a feeling that this option(-Nc) only helps eliminate unused functions.
This is not a problem: all debugging code is gone from final executable.
However,  all debug messages are still present.
And indeed,  it seems to have no effect(just tried).

Aug 18 2003