add -Wundef, fix uncovered bugs
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@@ -11,7 +11,7 @@ CPPFLAGS += \
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-D_GNU_SOURCE -DNDEBUG \
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$(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
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-D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP \
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-Wall -Wstrict-prototypes -Wshadow -Werror \
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-Wall -Wstrict-prototypes -Wshadow -Werror -Wundef \
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-funsigned-char -fno-builtin-strlen -finline-limit=0 -static-libgcc \
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-Os -falign-functions=1 -falign-jumps=1 -falign-loops=1 \
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-fomit-frame-pointer -ffunction-sections -fdata-sections
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