Re: about lposix

[Nick Gammon <nick@...>]

On 18/10/2006, at 11:21 AM, Mike Pall wrote:

> To use the Cygwin-provided toolchain, you need -mno-cygwin *and*
> the mingw target. You can do this without changing the Makefile:
>
>   make "CC=gcc -mno-cygwin" mingw
>
> Or just build Lua using plain MinGW with: make mingw

Sorry if this is getting a bit off-topic, but here goes ...

That works fine, and I get a dll that doesn't require cygwin1.dll.  
But ...

I amended luaconf.h to add this line:

#define LUA_USELONGLONG

Now, when compiled, and I try this:

print (string.format ("%i", 2^62))  --> should be:  
4611686018427387904, but is: 0

A quick test using this program has some interesting results:

-------------
#include <stdio.h>

int main (void)
  {
  long long x = 4611686018427387904LL;
  printf ("%lld", x);
  return 0;
  }
-------------

If I compile this like so:  gcc test.c -o test
And test it: ./test
I get this: 4611686018427387904

But, if I compile like this: gcc test.c -mno-cygwin -o test
And test it: ./test
I get this: 0

Internally Lua is using the %lld format to do a string.format (if you  
have LUA_USELONGLONG defined) so the problem with my test program is  
what is causing the problem with Lua.

How do I compile and link, without needing the cygwin1.dll library,  
but still getting the correct "long long" functionality?

- Nick