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mk: adjust gcc flags for new gcc 7 warnings

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There are two new warnings in GCC 7 that cause problems in the DPDK
compile.

1. GCC now warns if you have a switch fall-through without a suitable
comment indicating that it was intentional. The compiler supports a number
of levels of warning which are triggered depending on the type of message
used, with level 3 being the default. To accept a wider range of possible
fall-through messages, we adjust this down to level 2.

2. GCC also warns about an snprintf where there may be truncation and the
return value is not checked. Given that we often use snprintf in DPDK in
place of strncpy, and in many cases where truncation is not a problem, we
can just disable this particular warning.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
This commit is contained in:
Bruce Richardson 2017-05-04 16:38:13 +01:00 committed by Thomas Monjalon
parent 131fe44346
commit ced3e6f81b
1 changed files with 7 additions and 0 deletions
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7
mk/toolchain/gcc/rte.vars.mk
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@ -99,5 +99,12 @@ ifeq ($(shell test $(GCC_VERSION) -lt 47 && echo 1), 1)
WERROR_FLAGS += -Wno-uninitialized
endif
ifeq ($(shell test $(GCC_VERSION) -gt 70 && echo 1), 1)
# Tell GCC only to error for switch fallthroughs without a suitable comment
WERROR_FLAGS += -Wimplicit-fallthrough=2
# Ignore errors for snprintf truncation
WERROR_FLAGS += -Wno-format-truncation
endif
export CC AS AR LD OBJCOPY OBJDUMP STRIP READELF
export TOOLCHAIN_CFLAGS TOOLCHAIN_LDFLAGS TOOLCHAIN_ASFLAGS