> It enables link-time optimizations. The compiler/linker can see further into
> to the source, and detect errors not seen at the module level.
>
> It's saying that your callback routine must be declared/typedefed as a
> "curl_write_callback".
Thanks Tim.
Which is actually:
typedef size_t (*curl_write_callback)(char *buffer,
size_t size,
size_t nitems,
void *outstream);
as per curl.h and is the same as the example code:
https://curl.se/libcurl/c/getinmemory.html
so if I switch to:
static curl_write_callback curl_to_jansson_to_version(void *buffer, size_t size,
size_t nmemb, json_t *json)
{
I get:
Incompatible integer to pointer conversion returning 'unsigned long'
from a function with result type 'curl_write_callback' (aka 'unsigned
long (*)(char *, unsigned long, unsigned long, void *)')
error: returning ‘size_t’ {aka ‘long unsigned int’} from a function
with return type ‘curl_write_callback’ {aka ‘long unsigned int
(*)(char *, long unsigned int, long unsigned int, void *)’} makes
pointer from integer without a cast [-Werror=int-conversion]
43 | return size * nmemb;
| ~~~~~^~~~~~~
so I'd need to cast that.
Gavin Henry.
https://sentrypeer.org
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