[Zlib-devel] TR: the win32\Makefile.msc diff

[William A. Rowe Jr.]

On 3/22/2010 2:06 AM, Jonathan Nieder wrote:
> William A. Rowe Jr. wrote:
>>>> On 3/21/2010 4:22 PM, Enrico Weigelt wrote:
> 
>>>>> But you can make the compiler fail if sizeof(..) doesnt match a
>>>>> specific size, so use for a compile-test (in ./configure).
> [...]
>> But is this a compile-time fail or a runtime fail?
> 
> It fails at compile time.  You can declare an array like this:
> 
>  int dummy[(sizeof(z_off64_t) != 8) ? -1 : 1];
> 
> sizeof(z_off64_t) is a compile-time constant, and as long as it is 8,
> this is valid C, declaring a one-element array.  If it is not 8, then
> this code fails to compile.
> 
> It’s an old trick.  I doubt it originated with the Linux kernel.

Slick ;-)  Worthy waste of 8 bytes - thanks!