> 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 -- Unsubscribe: https://lists.haxx.se/listinfo/curl-library Etiquette: https://curl.haxx.se/mail/etiquette.html