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    Subject[PATCH 4.4 14/70] kbuild: Add support to generate LLVM assembly files
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Vinícius Tinti <viniciustinti@gmail.com>

    commit 433db3e260bc8134d4a46ddf20b3668937e12556 upstream.

    Add rules to kbuild in order to generate LLVM assembly files with the .ll
    extension when using clang.

    # from c code
    make CC=clang kernel/pid.ll

    Signed-off-by: Vinícius Tinti <viniciustinti@gmail.com>
    Signed-off-by: Behan Webster <behanw@converseincode.com>
    Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
    Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
    [nc: Fix conflicts due to lack of commit 6b90bd4ba40b3 in linux-4.4.y]
    Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    .gitignore | 1 +
    Makefile | 5 +++++
    scripts/Makefile.build | 8 ++++++++
    3 files changed, 14 insertions(+)

    --- a/.gitignore
    +++ b/.gitignore
    @@ -33,6 +33,7 @@
    *.lzo
    *.patch
    *.gcno
    +*.ll
    modules.builtin
    Module.symvers
    *.dwo
    --- a/Makefile
    +++ b/Makefile
    @@ -1307,6 +1307,8 @@ help:
    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
    @echo ' dir/ - Build all files in dir and below'
    @echo ' dir/file.[ois] - Build specified target only'
    + @echo ' dir/file.ll - Build the LLVM assembly file'
    + @echo ' (requires compiler support for LLVM assembly generation)'
    @echo ' dir/file.lst - Build specified mixed source/assembly target only'
    @echo ' (requires a recent binutils and recent build (System.map))'
    @echo ' dir/file.ko - Build module including final link'
    @@ -1482,6 +1484,7 @@ clean: $(clean-dirs)
    -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
    -o -name '*.symtypes' -o -name 'modules.order' \
    -o -name modules.builtin -o -name '.tmp_*.o.*' \
    + -o -name '*.ll' \
    -o -name '*.gcno' \) -type f -print | xargs rm -f

    # Generate tags for editors
    @@ -1585,6 +1588,8 @@ endif
    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
    %.symtypes: %.c prepare scripts FORCE
    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
    +%.ll: %.c prepare scripts FORCE
    + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)

    # Modules
    /: prepare scripts FORCE
    --- a/scripts/Makefile.build
    +++ b/scripts/Makefile.build
    @@ -175,6 +175,14 @@ cmd_cc_symtypes_c =
    $(obj)/%.symtypes : $(src)/%.c FORCE
    $(call cmd,cc_symtypes_c)

    +# LLVM assembly
    +# Generate .ll files from .c
    +quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
    + cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
    +
    +$(obj)/%.ll: $(src)/%.c FORCE
    + $(call if_changed_dep,cc_ll_c)
    +
    # C (.c) files
    # The C file is compiled and updated dependency information is generated.
    # (See cmd_cc_o_c + relevant part of rule_cc_o_c)

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