What does OPENSSL_NO_DEPRECATED_3_0 mean?

For example, consider this snippet:

# ifndef OPENSSL_NO_DEPRECATED_3_0 OSSL_DEPRECATEDIN_3_0 size_t HMAC_size(const HMAC_CTX *e); OSSL_DEPRECATEDIN_3_0 HMAC_CTX *HMAC_CTX_new(void); OSSL_DEPRECATEDIN_3_0 int HMAC_CTX_reset(HMAC_CTX *ctx); OSSL_DEPRECATEDIN_3_0 void HMAC_CTX_free(HMAC_CTX *ctx); # endif 

I want to understand what exactly OPENSSL_NO_DEPRECATED_3_0 means, the wordplay is confusing to me, is it not deprecated or is it deprecated?

1 Answer

From the OpenSSL page:

OPENSSL_NO_DEPRECATED — If this macro is defined, all deprecated public symbols in all OpenSSL versions up to and including the version given by OPENSSL_API_COMPAT (or the default value given above, when OPENSSL_API_COMPAT isn't defined) will be hidden.