[En-Nut-Discussion] SVN compilation fix: lanc111.c

[Uwe Bonnes]

Hello,

with (avr-) gcc version 4.4.1 [gcc-4_4-branch revision 150839] (SUSE Linux)
recent Sourceforge SVN doesn't compile arch/avr/dev/lanc111.c:
cc1: warnings being treated as errors
../.././/arch/avr/dev/lanc111.c: In function 'NicRxLanc':
../.././/arch/avr/dev/lanc111.c:1206: error: dereferencing type-punned \
pointer will break strict-aliasing rules
../.././/arch/avr/dev/lanc111.c:1206: error: dereferencing type-punned \
pointer will break strict-aliasing rules
make[1]: *** [avr/dev/lanc111.o] Fehler 1

Appended patch provides a solution that compiles clean.
-- 
Uwe Bonnes                bon at elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
Index: nut/arch/avr/dev/lanc111.c
===================================================================
--- nut/arch/avr/dev/lanc111.c	(Revision 2740)
+++ nut/arch/avr/dev/lanc111.c	(Arbeitskopie)
@@ -1203,7 +1203,10 @@
      * set.
      */
     for (;;) {
-        if (*((uint32_t *) (ifn->if_mac)) && *((uint32_t *) (ifn->if_mac)) != 0xFFFFFFFFUL) {
+      uint32_t test_NULL = 0UL;
+      uint32_t test_MAX = 0xFFFFFFFFUL;
+      
+      if ((memcmp(ifn->if_mac, &test_NULL, 4)) && (memcmp(ifn->if_mac, &test_MAX, 4))) {
             break;
         }
         NutSleep(63);