Attempt to get asm rodata working on macosx.

ChangeLog

 2013-12-17  Niels Möller  <nisse@lysator.liu.se>
 
+	* configure.ac (ASM_RODATA): New substituted variable. Needed for
+	portability to darwin.
+	* config.m4.in: Define RODATA, using configure variable ASM_RODATA
+	* x86_64/gcm-hash8.asm: Use RODATA macro.
+
 	* bignum-random-prime.c (_nettle_generate_pocklington_prime): Use
 	stronger variants of Pocklington's theorem, to allow p0 of size
 	down to bits/3.

config.m4.in

@@ -6,6 +6,7 @@ define(<TYPE_PROGBITS>, <@ASM_TYPE_PROGBITS@>)dnl
 define(<ALIGN_LOG>, <@ASM_ALIGN_LOG@>)dnl
 define(<ALIGNOF_UINT64_T>, <@ALIGNOF_UINT64_T@>)dnl
 define(<W64_ABI>, <@W64_ABI@>)dnl
+define(<RODATA>, <@ASM_RODATA@>)dnl
 divert(1)
 @ASM_MARK_NOEXEC_STACK@
 divert

configure.ac

@@ -332,10 +332,19 @@ EOF
       AC_MSG_WARN([No assembler files found.])
     fi
   fi
+  case "$host_os" in
+    darwin*)
+      ASM_RODATA='.section __TEXT,__const'
+      ;;
+    *)
+      ASM_RODATA='.section .rodata'
+      ;;
+  esac
 fi
 
 AC_SUBST([OPT_ASM_NETTLE_SOURCES])
 AC_SUBST([OPT_ASM_HOGWEED_SOURCES])
+AC_SUBST([ASM_RODATA])
 
 AH_VERBATIM([HAVE_NATIVE],
 [/* Define to 1 each of the following for which a native (ie. CPU specific)

x86_64/gcm-hash8.asm

@@ -188,7 +188,7 @@ ALIGN(16)
 EPILOGUE(_nettle_gcm_hash8)
 
 define(<W>, <0x$2$1>)
-	.section .rodata
+	RODATA
 	ALIGN(2)
 .Lshift_table:
 .short W(00,00),W(01,c2),W(03,84),W(02,46),W(07,08),W(06,ca),W(04,8c),W(05,4e)