[dpdk-dev] [PATCH] mk: disable warning with gcc 9 on Fedora 30

Reshma Pattan reshma.pattan at intel.com
Thu May 2 11:33:34 CEST 2019


gcc 9 on Fedora 30 gives an error
"taking address of packed member may result in an
unaligned pointer value" warnings.

For clang builds this warning is already disabled,
so disable "-Waddress-of-packed-member" for gcc builds
also.

Snippet of build error:
...lib/librte_eal/linux/eal/eal_memalloc.c: In function ‘alloc_seg_walk’:
...lib/librte_eal/linux/eal/eal_memalloc.c:768:12: error: taking address
of packed member of ‘struct rte_mem_config’ may result in an unaligned
pointer value [-Werror=address-of-packed-member]
  768 |  cur_msl = &mcfg->memsegs[msl_idx];
      |            ^~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Reshma Pattan <reshma.pattan at intel.com>
---
 mk/toolchain/gcc/rte.vars.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mk/toolchain/gcc/rte.vars.mk b/mk/toolchain/gcc/rte.vars.mk
index d8b99faf6..b852fcfd7 100644
--- a/mk/toolchain/gcc/rte.vars.mk
+++ b/mk/toolchain/gcc/rte.vars.mk
@@ -87,5 +87,8 @@ WERROR_FLAGS += -Wimplicit-fallthrough=2
 WERROR_FLAGS += -Wno-format-truncation
 endif
 
+# disable packed member unalign warnings
+WERROR_FLAGS += -Wno-address-of-packed-member
+
 export CC AS AR LD OBJCOPY OBJDUMP STRIP READELF
 export TOOLCHAIN_CFLAGS TOOLCHAIN_LDFLAGS TOOLCHAIN_ASFLAGS
-- 
2.21.0



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