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mk: fix build for clang 4

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clang 4 gives "taking address of packed member may result in an
unaligned pointer value" warnings in a few locations [1].

Disabled "-Waddress-of-packed-member" warning for clang >= 4

[1] build errors:
.../lib/librte_eal/common/eal_common_memzone.c:275:25:
error: taking address of packed member 'mlock' of class or structure
'rte_mem_config' may result in an unaligned pointer value
[-Werror,-Waddress-of-packed-member]
        rte_rwlock_write_lock(&mcfg->mlock);
                               ^~~~~~~~~~~

.../lib/librte_ip_frag/rte_ipv4_reassembly.c:139:31:
error: taking address of packed member 'src_addr' of class or structure
'ipv4_hdr' may result in an unaligned pointer value
[-Werror,-Waddress-of-packed-member]
        psd = (unaligned_uint64_t *)&ip_hdr->src_addr;
                                     ^~~~~~~~~~~~~~~~

.../lib/librte_vhost/vhost_user.c:1037:34:
error: taking address of packed member 'payload' of class or structure
'VhostUserMsg' may result in an unaligned pointer value
[-Werror,-Waddress-of-packed-member]
	vhost_user_set_vring_num(dev, &msg.payload.state);
				       ^~~~~~~~~~~~~~~~~

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
This commit is contained in:
Ferruh Yigit 2017-04-17 15:35:58 +01:00 committed by Thomas Monjalon
parent 74df3fd302
commit 95cd37070a
1 changed files with 5 additions and 0 deletions
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5
mk/toolchain/clang/rte.vars.mk
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@ -79,5 +79,10 @@ include $(RTE_SDK)/mk/toolchain/$(RTE_TOOLCHAIN)/rte.toolchain-compat.mk
# workaround clang bug with warning "missing field initializer" for "= {0}"
WERROR_FLAGS += -Wno-missing-field-initializers
# disable packed member unalign warnings
ifeq ($(shell test $(CLANG_MAJOR_VERSION) -ge 4 && echo 1), 1)
WERROR_FLAGS += -Wno-address-of-packed-member
endif
export CC AS AR LD OBJCOPY OBJDUMP STRIP READELF
export TOOLCHAIN_CFLAGS TOOLCHAIN_LDFLAGS TOOLCHAIN_ASFLAGS