Experimental Physics and
Industrial Control System

Hi:

Not re-defining NULL is good.

The specific fix for alh or other code that uses var-arg, however,
is to ignore the old man pages that might talk about NULL,
and always cast 0 to the specific type:

   some_func("widgetWidth", (int) 0,
             "callback_arg", (void *) 0,
             "num_entries", (long) 0,  ...)

For all these, NULL might have worked on 32 bit,
but it won't now.

-Kay

On Oct 31, 2006, at 16:26 , Andrew Johnson wrote:

Putting the following define in all .c source files (after the last
#include)

  #define NULL 0L

does indeed fix things.

It may fix things on your 64-bit machine, but it won't everywhere -- you're providing a long argument when the XtVaSetValues() routine is looking for a pointer; the two may still be different sizes on other machines.

NULL is a strange beast. On my linux-x86 machine gcc 4.0.2 defines it as ((void *)0) whereas g++ 4.0.2 defines it as __null. The Solaris C C++ compiler defines it to be 0 in all circumstances; the C compiler uses 0L if we're compiling for LP64 archs, else 0.

I think that the correct solution is to accept the compiler's definition and just use NULL. Thus if removing NULL from dbDefs.h solves this problem then that's the right solution for now and it'll be that way from R3.14.9 onwards.

- Andrew
--
There is considerable overlap between the intelligence of the smartest
bears and the dumbest tourists -- Yosemite National Park Ranger

Replies:

Re: Getting alh to run on AMD64 (linux 64-bit OS) Eric Norum

References:

Re: Getting alh to run on AMD64 (linux 64-bit OS) Andrew Johnson

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