Varargs issue with LDC

[Johan]

On Wednesday, 31 January 2024 at 18:11:43 UTC, Johan wrote:
> On Wednesday, 31 January 2024 at 17:16:51 UTC, Don Allen wrote:
>>
>> The called gtk function has this prototype, which I believe is 
>> correct:
>> ````
>> extern (C) GtkListStore* gtk_list_store_new (gint n_columns, 
>> ...);
>> ````
>> The call site looks like
>> ````
>>         writefln("debug: %d",  NMktStore.num_cols);
>>         store = gtk_list_store_new(NMktStore.num_cols,
>>                 g_type_string, // date
>>                 g_type_string, // num
>>                 g_type_string, // description
>>                 g_type_boolean, // r
>>                 g_type_string, // transaction guid
>>                 g_type_string, // value
>>                 g_type_string); // balance
>> ````
>
> Did you check that the D type of `g_type_string/boolean` 
> matches the size of the type of the C constants? (`GType` which 
> is `unsigned long` in C, 
> https://codebrowser.dev/gtk/gtk/subprojects/glib/gobject/gtype.h.html#383)
>
> -Johan

Here is a small example in godbolt. LDC and Clang generate 
identical assembly code, so looks like LDC is doing the right 
thing here.

https://d.godbolt.org/z/rMK1PqKjv

What C/C++ (nota bene) compiler did you use to build Gtk ?

-Johan