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digitalmars.D.learn - "...cannot be interpreted at compile time" I can't find the source of

reply Pablo De =?UTF-8?B?TsOhcG9saQ==?= <nospam dev.null> writes:
I am trying to write a D wrapper for libmpdec 
(https://www.bytereef.org/mpdecimal/).

I get the following message (compiling with dmd with -v and 
-verrros=context)

     semantic2 cuenta
     mpdec/decimal.d(35,20): Error: `mpd_new` cannot be 
interpreted at compile time, because it has no available source 
code
           value=mpd_new(&decimal_ctx);// constructor from int

     caused by the following constructor...

class Decimal{

         mpd_t* value;


     this(int x)
         {
           value=mpd_new(&decimal_ctx);// constructor from int
           mpd_set_i32(value, x, &decimal_ctx);
         }

      }

The problem is that I cannot figure out which line in my code 
causes this constructor
to be interpreted at compile time! It would be useful if dmd 
could print more specific
error messages.

Any idea of which could be the cause of trouble or on how to get 
more specific 	diagnosis?
Many thanks!
Aug 19 2021
parent reply jfondren <julian.fondren gmail.com> writes:
On Friday, 20 August 2021 at 02:30:53 UTC, Pablo De Nápoli wrote:

 Any idea of which could be the cause of trouble or on how to 
 get more specific 	diagnosis?


With no extra arguments I get a "compile time context created 
here" addendum. Does that not show up for you or does the line 
not make sense still?

It might also be new. This is with v2.097.1

```
example.d(6): Error: `atoi` cannot be interpreted at compile 
time, because it has no available source code
example.d(12):        compile time context created here
example.d(13): Error: no property `val` for type `void`
```

 From this code:

```d
extern (C) int atoi(const(char)* nptr);

class N {
     int val;
     this() {
         val = atoi("2");
     }
}

void main() {
     import std.stdio : writeln;
     enum n = new N(); // line 12
     writeln(n.val);
}
```
Aug 19 2021
parent Pablo De =?UTF-8?B?TsOhcG9saQ==?= <nospam dev.null> writes:
On Friday, 20 August 2021 at 02:51:16 UTC, jfondren wrote:

 On Friday, 20 August 2021 at 02:30:53 UTC, Pablo De Nápoli 
 wrote:

 Any idea of which could be the cause of trouble or on how to 
 get more specific 	diagnosis?


 With no extra arguments I get a "compile time context created 
 here" addendum. Does that not show up for you or does the line 
 not make sense still?

 It might also be new. This is with v2.097.1

 ```
 example.d(6): Error: `atoi` cannot be interpreted at compile 
 time, because it has no available source code
 example.d(12):        compile time context created here
 example.d(13): Error: no property `val` for type `void`
 ```

 From this code:

 ```d
 extern (C) int atoi(const(char)* nptr);

 class N {
     int val;
     this() {
         val = atoi("2");
     }
 }

 void main() {
     import std.stdio : writeln;
     enum n = new N(); // line 12
     writeln(n.val);
 }
 ```


Many thanks!. I'm using the same version of the compiler.
Without arguments, I get

mpdec/decimal.d(35,20): Error: `mpd_new` cannot be interpreted at 
compile time, because it has no available source code
Error: cannot interpret `<error>` at compile time
mpdec/decimal.d(35,20): Error: `mpd_new` cannot be interpreted at 
compile time, because it has no available source code


Nothing like

"compile time context created here"

(this is what I would need to trace the error!)
Aug 19 2021