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kbuild: fix comment about missing include guard detection
The keyword here is 'twice' to explain the trick. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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@ -93,7 +93,7 @@ no-header-test += asm-generic/%
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extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
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extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
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# Include the header to detect missing include guard.
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# Include the header twice to detect missing include guard.
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quiet_cmd_hdrtest = HDRTEST $<
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quiet_cmd_hdrtest = HDRTEST $<
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cmd_hdrtest = \
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cmd_hdrtest = \
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$(CC) $(c_flags) -S -o /dev/null -x c /dev/null \
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$(CC) $(c_flags) -S -o /dev/null -x c /dev/null \
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