File 02-fix-type-puns.diff of Package ultimatestunts

From: Jan Engelhardt <jengelh@inai.de>
Date: 2012-11-25 16:20:56.258246775 +0100
Status: sent to upstream

build: resolve compiler's hard warnings about type punning

g++ -DHAVE_CONFIG_H -I. -I. -I.. -I../intl -I../shared   -DSYSCONFDIR="\"/etc\""   -Wall   -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -c -o udpnet.o udpnet.cpp
udpnet.cpp: In member function 'virtual bool CUDPNet::sendData(CMessageBuffer&)':
udpnet.cpp:158:33: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
gcc -DHAVE_CONFIG_H -I. -I. -I.. -I../graphics -I../intl -I../shared   -DSYSCONFDIR="\"/etc\""   -Wall   -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -c lw.c
lw.c: In function 'read_float':
lw.c:67:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]

---
 simulation/udpnet.cpp |    3 ++-
 stunts3dedit/lw.c     |    6 +++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

Index: ultimatestunts-srcdata-0771/simulation/udpnet.cpp
===================================================================
--- ultimatestunts-srcdata-0771.orig/simulation/udpnet.cpp
+++ ultimatestunts-srcdata-0771/simulation/udpnet.cpp
@@ -155,7 +155,8 @@ bool CUDPNet::sendData(CMessageBuffer &d
 	Uint8 num8[4];
 	for(unsigned int i=0; i<4; i++)
 		num8[i] = ipnum[i];
-	Uint32 num32 = *((Uint32 *)num8);
+	Uint32 num32;
+	memcpy(&num32, num8, sizeof(num32));
 
 	//printf("Sending to %d.%d.%d.%d port %d\n", num8[0], num8[1], num8[2], num8[3], data.getPort());
 
Index: ultimatestunts-srcdata-0771/stunts3dedit/lw.c
===================================================================
--- ultimatestunts-srcdata-0771.orig/stunts3dedit/lw.c
+++ ultimatestunts-srcdata-0771/stunts3dedit/lw.c
@@ -23,6 +23,7 @@ Modified by CJP
 
 #include "lw.h"
 
+#include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -63,8 +64,11 @@ static Uint32 read_long(FILE *f)
 
 static float read_float(FILE *f)
 {
+  float r;
   Uint32 x = read_long(f);
-  return *((float*)(void*)(&x)); /* CJP note: possibly doesn't work on every architecture */
+  assert(sizeof(float) == sizeof(Uint32));
+  memcpy(&r, &x, sizeof(r));
+  return r;
 }
 
 static int read_string(FILE *f, char *s)