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Date: Sat, 12 Feb 2022 21:55:27 +0100 (CET)
From: Marc Glisse <marc.glisse@inria.fr>
Reply-To: gcc@gcc.gnu.org
To: Andrea Monaco <andrea.monaco@autistici.org>
cc: gcc@gcc.gnu.org
Subject: Re: "cannot convert to a pointer type" error repeated tens of
 times
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On Sat, 12 Feb 2022, Andrea Monaco via Gcc wrote:

>  #include <curl/curl.h>
>
>  int
>  main (void)
>  {
>    float a;
>
>    curl_easy_setopt (NULL, 0, (void *) a);
>  }
>
>
> with "gcc -c bug.c" gives
>
>
>  bug.c: In function ‘main’:
>  bug.c:15:3: error: cannot convert to a pointer type
>     curl_easy_setopt (NULL, 0, (void *) a);
>     ^~~~~~~~~~~~~~~~
>  bug.c:15:3: error: cannot convert to a pointer type
>  bug.c:15:3: error: cannot convert to a pointer type
>  bug.c:15:3: error: cannot convert to a pointer type
>  [...]
>  bug.c:15:3: error: cannot convert to a pointer type
>  In file included from /usr/include/x86_64-linux-gnu/curl/curl.h:2826,
>                   from bug.c:1:
>  bug.c:15:3: error: cannot convert to a pointer type
>     curl_easy_setopt (NULL, 0, (void *) a);
>     ^~~~~~~~~~~~~~~~
>  bug.c:15:3: error: cannot convert to a pointer type
>     curl_easy_setopt (NULL, 0, (void *) a);
>     ^~~~~~~~~~~~~~~~
>  bug.c:15:3: error: cannot convert to a pointer type
>     curl_easy_setopt (NULL, 0, (void *) a);
>     ^~~~~~~~~~~~~~~~
>
>
> The error message is correct, but is repeated tens of times.
> The function is declared this way in curl.h
>
>  CURL_EXTERN CURLcode curl_easy_setopt(CURL *curl, CURLoption option,
>  ...);

No, curl_easy_setopt is a macro. If you look at the preprocessed code, you 
get many statements doing the same wrong operation, and one warning for 
each of them.

(wrong list, should be gcc-help, or an issue on bugzilla)

-- 
Marc Glisse