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kbuild: remove header compile test

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commit fcbb8461fd2376ba3782b5b8bd440c929b8e4980 upstream.

There are both positive and negative options about this feature.
At first, I thought it was a good idea, but actually Linus stated a
negative opinion (https://lkml.org/lkml/2019/9/29/227). I admit it
is ugly and annoying.

The baseline I'd like to keep is the compile-test of uapi headers.
(Otherwise, kernel developers have no way to ensure the correctness
of the exported headers.)

I will maintain a small build rule in usr/include/Makefile.
Remove the other header test functionality.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
[ added to 5.4.y due to start of build warnings from backported patches
  because of this feature - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masahiro Yamada 2019-11-07 16:14:40 +09:00 • committed by Greg Kroah-Hartman
commit ef134d8b49
8 changed files with 9 additions and 1252 deletions
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9
scripts/Makefile.build
View file

@ -283,15 +283,6 @@ quiet_cmd_cc_lst_c = MKLST $@
$(obj)/%.lst: $(src)/%.c FORCE
$(call if_changed_dep,cc_lst_c)
# header test (header-test-y, header-test-m target)
# ---------------------------------------------------------------------------
quiet_cmd_cc_s_h = CC $@
cmd_cc_s_h = $(CC) $(c_flags) -S -o $@ -x c /dev/null -include $<
$(obj)/%.h.s: $(src)/%.h FORCE
$(call if_changed_dep,cc_s_h)
# Compile assembler sources (.S)
# ---------------------------------------------------------------------------

14
scripts/Makefile.lib
View file

@ -65,20 +65,6 @@ extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
endif
# Test self-contained headers
# Wildcard searches in $(srctree)/$(src)/, but not in $(objtree)/$(obj)/.
# Stale generated headers are often left over, so pattern matching should
# be avoided. Please notice $(srctree)/$(src)/ and $(objtree)/$(obj) point
# to the same location for in-tree building. So, header-test-pattern-y should
# be used with care.
header-test-y += $(filter-out $(header-test-), \
$(patsubst $(srctree)/$(src)/%, %, \
$(wildcard $(addprefix $(srctree)/$(src)/, \
$(header-test-pattern-y)))))
extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y) $(header-test-m))
# Add subdir path
extra-y := $(addprefix $(obj)/,$(extra-y))