[libvirt] [PATCH 5/7] Disable cast-align warnings in various places
Daniel P. Berrange
berrange at redhat.com
Wed Apr 3 15:06:39 UTC 2013
From: "Daniel P. Berrange" <berrange at redhat.com>
There are a number of places which generate cast alignment
warnings, which are difficult or impossible to address. Use
pragmas to disable the warnings in these few places
conf/nwfilter_conf.c: In function 'virNWFilterRuleDetailsParse':
conf/nwfilter_conf.c:1806:16: warning: cast increases required alignment of target type [-Wcast-align]
item = (nwItemDesc *)((char *)nwf + att[idx].dataIdx);
conf/nwfilter_conf.c: In function 'virNWFilterRuleDefDetailsFormat':
conf/nwfilter_conf.c:3238:16: warning: cast increases required alignment of target type [-Wcast-align]
item = (nwItemDesc *)((char *)def + att[i].dataIdx);
storage/storage_backend_mpath.c: In function 'virStorageBackendCreateVols':
storage/storage_backend_mpath.c:247:17: warning: cast increases required alignment of target type [-Wcast-align]
names = (struct dm_names *)(((char *)names) + next);
nwfilter/nwfilter_dhcpsnoop.c: In function 'virNWFilterSnoopDHCPDecode':
nwfilter/nwfilter_dhcpsnoop.c:994:15: warning: cast increases required alignment of target type [-Wcast-align]
pip = (struct iphdr *) pep->eh_data;
nwfilter/nwfilter_dhcpsnoop.c:1004:11: warning: cast increases required alignment of target type [-Wcast-align]
pup = (struct udphdr *) ((char *) pip + (pip->ihl << 2));
nwfilter/nwfilter_learnipaddr.c: In function 'procDHCPOpts':
nwfilter/nwfilter_learnipaddr.c:327:33: warning: cast increases required alignment of target type [-Wcast-align]
uint32_t *tmp = (uint32_t *)&dhcpopt->value;
nwfilter/nwfilter_learnipaddr.c: In function 'learnIPAddressThread':
nwfilter/nwfilter_learnipaddr.c:501:43: warning: cast increases required alignment of target type [-Wcast-align]
struct iphdr *iphdr = (struct iphdr*)(packet +
nwfilter/nwfilter_learnipaddr.c:538:43: warning: cast increases required alignment of target type [-Wcast-align]
struct iphdr *iphdr = (struct iphdr*)(packet +
nwfilter/nwfilter_learnipaddr.c:544:48: warning: cast increases required alignment of target type [-Wcast-align]
struct udphdr *udphdr= (struct udphdr *)
Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
m4/virt-compile-warnings.m4 | 1 +
src/conf/nwfilter_conf.c | 4 ++++
src/internal.h | 13 +++++++++++++
src/nwfilter/nwfilter_dhcpsnoop.c | 4 ++++
src/nwfilter/nwfilter_learnipaddr.c | 10 ++++++++++
src/storage/storage_backend_mpath.c | 2 ++
6 files changed, 34 insertions(+)
diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4
index a08fcac..e054913 100644
--- a/m4/virt-compile-warnings.m4
+++ b/m4/virt-compile-warnings.m4
@@ -93,6 +93,7 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
if test $lv_cv_gcc_pragma_push_works = no; then
dontwarn="$dontwarn -Wmissing-prototypes"
dontwarn="$dontwarn -Wmissing-declarations"
+ dontwarn="$dontwarn -Wcast-align"
fi
dnl Check whether strchr(s, char variable) causes a bogus compile
diff --git a/src/conf/nwfilter_conf.c b/src/conf/nwfilter_conf.c
index e63a04b..b61010d 100644
--- a/src/conf/nwfilter_conf.c
+++ b/src/conf/nwfilter_conf.c
@@ -1803,7 +1803,9 @@ virNWFilterRuleDetailsParse(xmlNodePtr node,
while (att[idx].name != NULL) {
prop = virXMLPropString(node, att[idx].name);
+ VIR_WARNINGS_NO_CAST_ALIGN
item = (nwItemDesc *)((char *)nwf + att[idx].dataIdx);
+ VIR_WARNINGS_RESET
flags = &item->flags;
flags_set = match_flag;
@@ -3235,7 +3237,9 @@ virNWFilterRuleDefDetailsFormat(virBufferPtr buf,
nwItemDesc *item;
while (att[i].name) {
+ VIR_WARNINGS_NO_CAST_ALIGN
item = (nwItemDesc *)((char *)def + att[i].dataIdx);
+ VIR_WARNINGS_RESET
enum virNWFilterEntryItemFlags flags = item->flags;
if ((flags & NWFILTER_ENTRY_ITEM_FLAG_EXISTS)) {
if (!typeShown) {
diff --git a/src/internal.h b/src/internal.h
index 2cf4731..d819aa3 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -214,6 +214,19 @@
# endif
# endif /* __GNUC__ */
+
+# if __GNUC_PREREQ (4, 6)
+# define VIR_WARNINGS_NO_CAST_ALIGN \
+ _Pragma ("GCC diagnostic push") \
+ _Pragma ("GCC diagnostic ignored \"-Wcast-align\"")
+
+# define VIR_WARNINGS_RESET \
+ _Pragma ("GCC diagnostic pop")
+# else
+# define VIR_WARNINGS_NO_CAST_ALIGN
+# define VIR_WARNINGS_RESET
+# endif
+
/*
* Use this when passing possibly-NULL strings to printf-a-likes.
*/
diff --git a/src/nwfilter/nwfilter_dhcpsnoop.c b/src/nwfilter/nwfilter_dhcpsnoop.c
index 5124069..5012b14 100644
--- a/src/nwfilter/nwfilter_dhcpsnoop.c
+++ b/src/nwfilter/nwfilter_dhcpsnoop.c
@@ -991,7 +991,9 @@ virNWFilterSnoopDHCPDecode(virNWFilterSnoopReqPtr req,
/* go through the protocol headers */
switch (ntohs(pep->eh_type)) {
case ETHERTYPE_IP:
+ VIR_WARNINGS_NO_CAST_ALIGN;
pip = (struct iphdr *) pep->eh_data;
+ VIR_WARNINGS_RESET;
len -= offsetof(virNWFilterSnoopEthHdr, eh_data);
break;
default:
@@ -1001,7 +1003,9 @@ virNWFilterSnoopDHCPDecode(virNWFilterSnoopReqPtr req,
if (len < 0)
return -2;
+ VIR_WARNINGS_NO_CAST_ALIGN
pup = (struct udphdr *) ((char *) pip + (pip->ihl << 2));
+ VIR_WARNINGS_RESET
len -= pip->ihl << 2;
if (len < 0)
return -2;
diff --git a/src/nwfilter/nwfilter_learnipaddr.c b/src/nwfilter/nwfilter_learnipaddr.c
index 7a4f983..b399092 100644
--- a/src/nwfilter/nwfilter_learnipaddr.c
+++ b/src/nwfilter/nwfilter_learnipaddr.c
@@ -324,7 +324,9 @@ procDHCPOpts(struct dhcp *dhcp, int dhcp_opts_len,
case DHCP_OPT_BCASTADDRESS: /* Broadcast address */
if (dhcp_opts_len >= 6) {
+ VIR_WARNINGS_NO_CAST_ALIGN
uint32_t *tmp = (uint32_t *)&dhcpopt->value;
+ VIR_WARNINGS_RESET
(*bcastaddr) = ntohl(*tmp);
}
break;
@@ -498,8 +500,10 @@ learnIPAddressThread(void *arg)
if (etherType == ETHERTYPE_IP &&
(header.len >= ethHdrSize +
sizeof(struct iphdr))) {
+ VIR_WARNINGS_NO_CAST_ALIGN
struct iphdr *iphdr = (struct iphdr*)(packet +
ethHdrSize);
+ VIR_WARNINGS_RESET
vmaddr = iphdr->saddr;
/* skip mcast addresses (224.0.0.0 - 239.255.255.255),
* class E (240.0.0.0 - 255.255.255.255, includes eth.
@@ -514,8 +518,10 @@ learnIPAddressThread(void *arg)
} else if (etherType == ETHERTYPE_ARP &&
(header.len >= ethHdrSize +
sizeof(struct f_arphdr))) {
+ VIR_WARNINGS_NO_CAST_ALIGN
struct f_arphdr *arphdr = (struct f_arphdr*)(packet +
ethHdrSize);
+ VIR_WARNINGS_RESET
switch (ntohs(arphdr->arphdr.ar_op)) {
case ARPOP_REPLY:
vmaddr = arphdr->ar_sip;
@@ -535,14 +541,18 @@ learnIPAddressThread(void *arg)
if (etherType == ETHERTYPE_IP &&
(header.len >= ethHdrSize +
sizeof(struct iphdr))) {
+ VIR_WARNINGS_NO_CAST_ALIGN
struct iphdr *iphdr = (struct iphdr*)(packet +
ethHdrSize);
+ VIR_WARNINGS_RESET
if ((iphdr->protocol == IPPROTO_UDP) &&
(header.len >= ethHdrSize +
iphdr->ihl * 4 +
sizeof(struct udphdr))) {
+ VIR_WARNINGS_NO_CAST_ALIGN
struct udphdr *udphdr= (struct udphdr *)
((char *)iphdr + iphdr->ihl * 4);
+ VIR_WARNINGS_RESET
if (ntohs(udphdr->source) == 67 &&
ntohs(udphdr->dest) == 68 &&
header.len >= ethHdrSize +
diff --git a/src/storage/storage_backend_mpath.c b/src/storage/storage_backend_mpath.c
index b12b81f..6049063 100644
--- a/src/storage/storage_backend_mpath.c
+++ b/src/storage/storage_backend_mpath.c
@@ -243,8 +243,10 @@ virStorageBackendCreateVols(virStoragePoolObjPtr pool,
/* Given the way libdevmapper returns its data, I don't see
* any way to avoid this series of casts. */
+ VIR_WARNINGS_NO_CAST_ALIGN
next = names->next;
names = (struct dm_names *)(((char *)names) + next);
+ VIR_WARNINGS_RESET
} while (next);
--
1.8.1.4
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