[PATCH 1/3] Switch to strong aliases, allows for Windows targets

[Michael Haubenwallner]

Windows (Cygwin, MinGW) does not support weak symbols, and
actually there is no good reason to have them weak at all.
Also, inline assembly is not portable in general.
---
 src/sha2.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/sha2.c b/src/sha2.c
index 849ebbb..8d70fad 100644
--- a/src/sha2.c
+++ b/src/sha2.c
@@ -41,11 +41,8 @@
 #include <string.h>
 #include <sha2.h>
 
-#define _C_LABEL_STRING(x)	x
-
-#define	__weak_alias(alias,sym)						\
-	__asm(".weak " _C_LABEL_STRING(#alias) "\n"			\
-		_C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
+#define __strong_alias(newsym, sym) \
+	__typeof__ (sym) newsym __attribute__ ((alias (#sym)));
 
 /*
  * UNROLLED TRANSFORM LOOP NOTE:
@@ -820,9 +817,9 @@ SHA384Init(SHA2_CTX *context)
 	context->bitcount[0] = context->bitcount[1] = 0;
 }
 
-__weak_alias(SHA384Transform, SHA512Transform);
-__weak_alias(SHA384Update, SHA512Update);
-__weak_alias(SHA384Pad, SHA512Pad);
+__strong_alias(SHA384Transform, SHA512Transform)
+__strong_alias(SHA384Update, SHA512Update)
+__strong_alias(SHA384Pad, SHA512Pad)
 
 void
 SHA384Final(uint8_t digest[SHA384_DIGEST_LENGTH], SHA2_CTX *context)
-- 
2.21.0