[libvirt] [PATCH] util: compilation fix if build without GNUTLS library

[Roman Bogorodskiy]

  Mikhail Feoktistov wrote:

> ---
>  src/util/vircrypto.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/src/util/vircrypto.c b/src/util/vircrypto.c
> index 5183d49..4f288f0 100644
> --- a/src/util/vircrypto.c
> +++ b/src/util/vircrypto.c
> @@ -24,6 +24,7 @@
>  #include "virlog.h"
>  #include "virerror.h"
>  #include "viralloc.h"
> +#include "virrandom.h"
>  
>  #include "md5.h"
>  #include "sha256.h"
> @@ -220,14 +221,14 @@ virCryptoEncryptDataAESgnutls(gnutls_cipher_algorithm_t gnutls_enc_alg,
>   */
>  int
>  virCryptoEncryptData(virCryptoCipher algorithm,
> -                     uint8_t *enckey,
> +                     uint8_t *enckey ATTRIBUTE_UNUSED,
>                       size_t enckeylen,
> -                     uint8_t *iv,
> +                     uint8_t *iv ATTRIBUTE_UNUSED,
>                       size_t ivlen,
> -                     uint8_t *data,
> -                     size_t datalen,
> -                     uint8_t **ciphertext,
> -                     size_t *ciphertextlen)
> +                     uint8_t *data ATTRIBUTE_UNUSED,
> +                     size_t datalen ATTRIBUTE_UNUSED,
> +                     uint8_t **ciphertext ATTRIBUTE_UNUSED,
> +                     size_t *ciphertextlen ATTRIBUTE_UNUSED)
>  {
>      switch (algorithm) {
>      case VIR_CRYPTO_CIPHER_AES256CBC:

ACK; I've shortened commit message title a little and pushed to fix
build.

However, I'm wondering if there should be a better fix in long term to
avoid ATTRIBUTE_UNUSED for attributes that possibly could be used, e.g.
either using something like

#ifndef HAVE_GNUTLS_CIPHER_ENCRYPT
# define GNUTLS_ATTRIBUTE ATTRIBUTE_UNUSED
#else
# define GNUTLS_ATTRIBUTE

or just adding a stub for virCryptoEncryptData() as the actual
implementation does not *seem* to do anything useful without gnutls
anyway.

Roman Bogorodskiy
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