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From: Long Qin <qin.long@intel.com>
To: edk2-devel@lists.01.org
Cc: ting.ye@intel.com, hao.a.wu@intel.com, feng.tian@intel.com,
	eric.dong@intel.com, lersek@redhat.com,
	Qin Long <qin.long@intel.com>
Subject: [PATCH v2 2/4] CryptoPkg: Fix possible unresolved external symbol issue.
Date: Sat,  1 Apr 2017 13:38:32 +0800	[thread overview]
Message-ID: <20170401053834.12856-3-qin.long@intel.com> (raw)
In-Reply-To: <20170401053834.12856-1-qin.long@intel.com>

From: Qin Long <qin.long@intel.com>

The compiler (visual studio) may optimize some explicit strcmp call
in openssl source to use the intrinsic memcmp call.
In CrtLibSupport.h, we just use #define to mapping memcmp to
CompareMem API. So in Link phase, this kind of intrinsic optimization
will cause the "unresolved external symbol" error. For example:
    OpensslLib.lib(v3_utl.obj) : error LNK2001:
                               unresolved external symbol _memcmp

This patch will keep the memcmp mapping, and provide extra Intrinsic
memcmp wrapper to satisfy the symbol link.

Cc: Ting Ye <ting.ye@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qin Long <qin.long@intel.com>
---
 CryptoPkg/Include/CrtLibSupport.h                 |  1 +
 CryptoPkg/Library/IntrinsicLib/MemoryIntrinsics.c | 10 +++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/CryptoPkg/Include/CrtLibSupport.h b/CryptoPkg/Include/CrtLibSupport.h
index ddf7784a37..7f1ec12302 100644
--- a/CryptoPkg/Include/CrtLibSupport.h
+++ b/CryptoPkg/Include/CrtLibSupport.h
@@ -133,6 +133,7 @@ void           *malloc     (size_t);
 void           *realloc    (void *, size_t);
 void           free        (void *);
 void           *memset     (void *, int, size_t);
+int            memcmp      (const void *, const void *, size_t);
 int            isdigit     (int);
 int            isspace     (int);
 int            isxdigit    (int);
diff --git a/CryptoPkg/Library/IntrinsicLib/MemoryIntrinsics.c b/CryptoPkg/Library/IntrinsicLib/MemoryIntrinsics.c
index e8a76d07ff..bf485d680d 100644
--- a/CryptoPkg/Library/IntrinsicLib/MemoryIntrinsics.c
+++ b/CryptoPkg/Library/IntrinsicLib/MemoryIntrinsics.c
@@ -17,12 +17,14 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <Library/BaseMemoryLib.h>
 #include <Library/BaseLib.h>
 
+typedef UINTN  size_t;
+
 /* OpenSSL will use floating point support, and C compiler produces the _fltused
    symbol by default. Simply define this symbol here to satisfy the linker. */
 int _fltused = 1;
 
 /* Sets buffers to a specified character */
-void * memset (void *dest, char ch, unsigned int count)
+void * memset (void *dest, char ch, size_t count)
 {
   //
   // NOTE: Here we use one base implementation for memset, instead of the direct
@@ -46,6 +48,12 @@ void * memset (void *dest, char ch, unsigned int count)
   return dest;
 }
 
+/* Compare bytes in two buffers. */
+int memcmp (const void *buf1, const void *buf2, size_t count)
+{
+  return (int)CompareMem(buf1, buf2, count);
+}
+
 int strcmp (const char *s1, const char *s2)
 {
   return (int)AsciiStrCmp(s1, s2);
-- 
2.12.2.windows.1



  parent reply	other threads:[~2017-04-01  5:40 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-01  5:38 [PATCH v2 0/4] Resolving Some CryptoPkg Build Issues Long Qin
2017-04-01  5:38 ` [PATCH v2 1/4] CryptoPkg/OpensslLib: Suppress extra build warnings in openssl source Long Qin
2017-04-01  5:38 ` Long Qin [this message]
2017-04-01  5:38 ` [PATCH v2 3/4] CryptoPkg/BaseCryptLib: Adding NULL checking in time() wrapper Long Qin
2017-04-01  5:38 ` [PATCH v2 4/4] CryptoPkg: One workaround to resolve potential build issue Long Qin
2017-04-03 16:45 ` [PATCH v2 0/4] Resolving Some CryptoPkg Build Issues Laszlo Ersek
2017-04-06  8:54 ` Laszlo Ersek
2017-04-06 11:26   ` Long, Qin
2017-04-06 12:56     ` Laszlo Ersek
2017-04-06 14:17       ` Long, Qin
2017-04-06 17:17         ` Laszlo Ersek
2017-04-07 10:17         ` Laszlo Ersek
2017-04-07 13:22           ` Long, Qin

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