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CryptoPkg/IntrinsicLib: Fix CLANG38 IA32 build problem 

When use clang-3.8 to build the NetworkPkg, compiler optimization
may use memcpy for memory copy. For example:

 CryptoPkg/Library/OpensslLib/openssl/ssl/ssl_rsa.c:918: undefined
 reference to `memcpy'`

Compiler optimization is sophisticated, but we can work around it
use __attribute__((__used__)) to informs the compiler that symbol
should be retained in the object file, even if it may be
unreferenced.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Signed-off-by: Xiaoyu Lu <xiaoyux.lu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Xiaoyu Lu 2019-06-05 13:24:55 +08:00 committed by Liming Gao
parent b8993a34ae
commit 98d8f194e5
1 changed files with 13 additions and 0 deletions
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13
CryptoPkg/Library/IntrinsicLib/CopyMem.c
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@ -10,8 +10,21 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
#include <Base.h>
#include <Library/BaseMemoryLib.h>
#if defined(__clang__) && !defined(__APPLE__)
/* Copies bytes between buffers */
static __attribute__((__used__))
void * __memcpy (void *dest, const void *src, unsigned int count)
{
return CopyMem (dest, src, (UINTN)count);
}
__attribute__((__alias__("__memcpy")))
void * memcpy (void *dest, const void *src, unsigned int count);
#else
/* Copies bytes between buffers */
void * memcpy (void *dest, const void *src, unsigned int count)
{
return CopyMem (dest, src, (UINTN)count);
}
#endif