[gnutls-devel] GnuTLS | Redefinition of rsa_oaep_* symbols when compiled with Nettle 3.10 (#1565)

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Daiki Ueno created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1565



When building in Fedora rawhide, where Nettle 3.10 is available, I see the following warnings:
```console
In file included from ../../../lib/nettle/backport/rsa-oaep-encrypt.c:40:
../../../lib/nettle/int/rsa-oaep.h:44:9: warning: "rsa_oaep_sha256_encrypt" redefined
   44 | #define rsa_oaep_sha256_encrypt gnutls_nettle_backport_rsa_oaep_sha256_encrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../../lib/nettle/backport/rsa-oaep-encrypt.c:39:
/usr/include/nettle/rsa.h:91:9: note: this is the location of the previous definition
   91 | #define rsa_oaep_sha256_encrypt nettle_rsa_oaep_sha256_encrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
../../../lib/nettle/int/rsa-oaep.h:45:9: warning: "rsa_oaep_sha256_decrypt" redefined
   45 | #define rsa_oaep_sha256_decrypt gnutls_nettle_backport_rsa_oaep_sha256_decrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/nettle/rsa.h:92:9: note: this is the location of the previous definition
   92 | #define rsa_oaep_sha256_decrypt nettle_rsa_oaep_sha256_decrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
../../../lib/nettle/int/rsa-oaep.h:46:9: warning: "rsa_oaep_sha384_encrypt" redefined
   46 | #define rsa_oaep_sha384_encrypt gnutls_nettle_backport_rsa_oaep_sha384_encrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/nettle/rsa.h:93:9: note: this is the location of the previous definition
   93 | #define rsa_oaep_sha384_encrypt nettle_rsa_oaep_sha384_encrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
../../../lib/nettle/int/rsa-oaep.h:47:9: warning: "rsa_oaep_sha384_decrypt" redefined
   47 | #define rsa_oaep_sha384_decrypt gnutls_nettle_backport_rsa_oaep_sha384_decrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/nettle/rsa.h:94:9: note: this is the location of the previous definition
   94 | #define rsa_oaep_sha384_decrypt nettle_rsa_oaep_sha384_decrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
../../../lib/nettle/int/rsa-oaep.h:48:9: warning: "rsa_oaep_sha512_encrypt" redefined
   48 | #define rsa_oaep_sha512_encrypt gnutls_nettle_backport_rsa_oaep_sha512_encrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/nettle/rsa.h:95:9: note: this is the location of the previous definition
   95 | #define rsa_oaep_sha512_encrypt nettle_rsa_oaep_sha512_encrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
../../../lib/nettle/int/rsa-oaep.h:49:9: warning: "rsa_oaep_sha512_decrypt" redefined
   49 | #define rsa_oaep_sha512_decrypt gnutls_nettle_backport_rsa_oaep_sha512_decrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/nettle/rsa.h:96:9: note: this is the location of the previous definition
   96 | #define rsa_oaep_sha512_decrypt nettle_rsa_oaep_sha512_decrypt
      |         ^~~~~~~~~~~~~~~~~~~~~~~
```

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