D's error messaging is terrible in some ways. I am trying to get some code to work and this is the error:

arsd\stb_truetype.d(1246): Error: function core.stdc.stdlib.qsort (scope void* base, uint nmemb, uint size, extern (C) int function(scope const(void*), scope const(void*)) @system compar) is not callable using argument types (void*, int, uint, extern (C) int function(const(void*) p, const(void*) q))

Find the bug!

Why can't D just dive a bit further and tell me the actual parameter(s) that it failing on? It obviously knows this as it has to check each one to know if there is an error. It should make it clear so I don't have to hunt and peck for the error. These lines don't always get wrapped in all cases so it is a scrollfest trying to find it.

Do the lead programmers for D use Visual D? Or do they use a specific tool chain that exhibits a specific behavior that they assume translates in to every other case?

On Tuesday, 27 June 2017 at 14:29:05 UTC, FoxyBrown wrote:
> arsd\stb_truetype.d(1246): Error: function core.stdc.stdlib.qsort (scope void* base, uint nmemb, uint size, extern (C) int function(scope const(void*), scope const(void*)) @system compar) is not callable using argument types (void*, int, uint, extern (C) int function(const(void*) p, const(void*) q))
>
> Find the bug!
>

well for starters you're passing an int to nmemb paramater

On Tuesday, 27 June 2017 at 14:29:05 UTC, FoxyBrown wrote:
> D's error messaging is terrible in some ways. I am trying to get some code to work and this is the error:

This PR will improve the situation:
https://github.com/dlang/dmd/pull/6806

On Tuesday, 27 June 2017 at 14:29:05 UTC, FoxyBrown wrote:
> D's error messaging is terrible in some ways. I am trying to get some code to work and this is the error:

I agree, that error message is terrible, and that's why I have a PR open to change it.

But this specific case is weird to me too. stb_truetype.d is a port from C code, and I use it without any compile errors. Did you modify the code?

> Find the bug!

Even worse, I don't even see an error in that error message. The arguments it lists look acceptable.

On Tuesday, 27 June 2017 at 15:01:41 UTC, Adam D. Ruppe wrote:
> On Tuesday, 27 June 2017 at 14:29:05 UTC, FoxyBrown wrote:
>> D's error messaging is terrible in some ways. I am trying to get some code to work and this is the error:
>
> I agree, that error message is terrible, and that's why I have a PR open to change it.
>
> But this specific case is weird to me too. stb_truetype.d is a port from C code, and I use it without any compile errors. Did you modify the code?
>
>> Find the bug!
>
> Even worse, I don't even see an error in that error message. The arguments it lists look acceptable.

Hi Adam,

Yeah, I don't know, I think I had it working before but now it seems a lot of your code is not working. I did not change the std_truetype.d file. Just to make sure I copied and pasted the git source in to the original.

alias STBTT_sort = core.stdc.stdlib.qsort;

Is it possible that core.stdc.stdlib.qsort changed?

void    qsort(scope void* base, size_t nmemb, size_t size, _compare_fp_t
compar);


arsd\stb_truetype.d(1251): Error: function core.stdc.stdlib.qsort (scope void* base, uint nmemb, uint size, extern (C) int function(scope const(void*), scope const(void*)) @system compar) is not callable using argument types (void*, uint, uint, extern (C) int function(const(void*) p, const(void*) q))

I changed your variables to size_t and they obviously match. The things that don't match are the scope's.

qsort(scope void* base, uint nmemb, uint size, extern (C) int function(scope const(void*), scope const(void*)) @system compar)

           (void*,      uint,       uint,      extern (C) int function(const(void*) p, const(void*) q))



I am also getting a run time error with your png loading module.


			void popFront () {
				bufpos = 0;
				while (plpos != plpos.max && bufpos < chunkSize) {
					// do we have some bytes in zstream?
					if (zs.avail_in > 0) {
						// just unpack
						zs.next_out = cast(typeof(zs.next_out))(buffer.ptr+bufpos);
						int rd = chunkSize-bufpos;
						zs.avail_out = rd;
						auto err = inflate(&zs, Z_SYNC_FLUSH);
						if (err != Z_STREAM_END && err != Z_OK) throw new Exception("PNG unpack error");

Errors out with unpack error. This code used to work so it is probably on my system.