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crypto: only include gmp.h on MSVC to disable the warning, add a comment explaining why #1786

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Sep 6, 2025
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crypto: only include gmp.h on MSVC to disable the warning, add a comment explaining why #1786

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4 changes: 4 additions & 0 deletions src/engine/qcommon/crypto.h
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Expand Up @@ -27,10 +27,14 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "q_shared.h"
#include "qcommon.h"

/* The Nettle headers include the GMP header, this disables the warning
on GMP alone, not the whole Nettle. We don't use GMP directly ourselves. */
#if defined(_MSC_VER)
#pragma warning(push)
#pragma warning(disable : 4146) // "unary minus operator applied to unsigned type, result still unsigned"
#include <gmp.h>
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@slipher slipher Sep 4, 2025

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The Nettle headers include the GMP header. So this may be here just for the warning fix. You could get rid of the GMP include but the MSVC warning adjustment would still need to be used for the Nettle headers.

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@illwieckz illwieckz Sep 4, 2025

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Ah, I see.

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@illwieckz illwieckz Sep 4, 2025

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I modified the commit to only include GMP on MSVC for the purpose of disabling the warning, and added a comment explaining why we do that.

#pragma warning(pop)
#endif

#include <nettle/bignum.h>
#include <nettle/rsa.h>
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