On Sun, Sep 22, 2019 at 11:13 AM Anatoly Pugachev <matorola@xxxxxxxxx> wrote:
>
> Hello!
>
> Latest git kernel does not compile for me:
>
> ~/linux-2.6$ git desc
> v5.3-11506-gf7c3bf8fa7e5
>
> ~/linux-2.6$ make
> CALL scripts/checksyscalls.sh
> <stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
> CALL scripts/atomic/check-atomics.sh
> CHK include/generated/compile.h
> CC arch/sparc/vdso/vdso32/vclock_gettime.o
> unrecognized e_machine 18 arch/sparc/vdso/vdso32/vclock_gettime.o
> arch/sparc/vdso/vdso32/vclock_gettime.o: failed
> make[2]: *** [scripts/Makefile.build:266:
> arch/sparc/vdso/vdso32/vclock_gettime.o] Error 1
> make[2]: *** Deleting file 'arch/sparc/vdso/vdso32/vclock_gettime.o'
> make[1]: *** [scripts/Makefile.build:509: arch/sparc/vdso] Error 2
> make: *** [Makefile:1667: arch/sparc] Error
>
> but I was able to compile successfully v5.3-10169-g574cc4539762
>
> Not sure my bisect log is right, but here it is:
>
> $ git bisect good
> 54b8ae66ae1a3454a7645d159a482c31cd89ab33 is the first bad commit
> commit 54b8ae66ae1a3454a7645d159a482c31cd89ab33
> Author: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> Date: Fri Aug 30 13:34:01 2019 +0900
>
> kbuild: change *FLAGS_<basetarget>.o to take the path relative to $(obj)
>
> Kbuild provides per-file compiler flag addition/removal:
>
> CFLAGS_<basetarget>.o
> CFLAGS_REMOVE_<basetarget>.o
> AFLAGS_<basetarget>.o
> AFLAGS_REMOVE_<basetarget>.o
> CPPFLAGS_<basetarget>.lds
> HOSTCFLAGS_<basetarget>.o
> HOSTCXXFLAGS_<basetarget>.o
>
> The <basetarget> is the filename of the target with its directory and
> suffix stripped.
>
> This syntax comes into a trouble when two files with the same basename
> appear in one Makefile, for example:
>
> obj-y += foo.o
> obj-y += dir/foo.o
> CFLAGS_foo.o := <some-flags>
>
> Here, the <some-flags> applies to both foo.o and dir/foo.o
>
> The real world problem is:
>
> scripts/kconfig/util.c
> scripts/kconfig/lxdialog/util.c
>
> Both files are compiled into scripts/kconfig/mconf, but only the
> latter should be given with the ncurses flags.
>
> It is more sensible to use the relative path to the Makefile, like this:
>
> obj-y += foo.o
> CFLAGS_foo.o := <some-flags>
> obj-y += dir/foo.o
> CFLAGS_dir/foo.o := <other-flags>
>
> At first, I attempted to replace $(basetarget) with $*. The $* variable
> is replaced with the stem ('%') part in a pattern rule. This works with
> most of cases, but does not for explicit rules.
>
> For example, arch/ia64/lib/Makefile reuses rule_as_o_S in its own
> explicit rules, so $* will be empty, resulting in ignoring the per-file
> AFLAGS.
>
> I introduced a new variable, target-stem, which can be used also from
> explicit rules.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> Acked-by: Marc Zyngier <maz@xxxxxxxxxx>
>
> arch/arm/kvm/Makefile | 5 +++--
> arch/x86/entry/vdso/Makefile | 3 ++-
> drivers/gpu/drm/amd/display/dc/calcs/Makefile | 6 +++---
> drivers/gpu/drm/amd/display/dc/dcn20/Makefile | 2 +-
> drivers/gpu/drm/amd/display/dc/dml/Makefile | 17 +++++++----------
> drivers/gpu/drm/amd/display/dc/dsc/Makefile | 7 +++----
> drivers/gpu/drm/i915/Makefile | 2 +-
> scripts/Makefile.host | 22 +++++++++++-----------
> scripts/Makefile.lib | 13 ++++++++-----
> scripts/kconfig/Makefile | 8 ++++----
> 10 files changed, 43 insertions(+), 42 deletions(-)
> mator@ttip:~/linux-2.6$
>
>
> If someone wants to check how kernel compiles on sparc64, could use
> gcc compile farm machine (gcc202) to try on.
and i cannot test compile 54b8ae66ae1a3454a7645d159a482c31cd89ab33 as well :
~/linux-2.6$ git checkout 54b8ae66ae1a3454a7645d159a482c31cd89ab33
HEAD is now at 54b8ae66ae1a kbuild: change *FLAGS_<basetarget>.o to
take the path relative to $(obj)
~/linux-2.6$ make -j clean; make -j olddefconfig && nice make -j24
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
HOSTCC scripts/kconfig/confdata.o
HOSTCC scripts/kconfig/expr.o
LEX scripts/kconfig/lexer.lex.c
YACC scripts/kconfig/parser.tab.[ch]
HOSTCC scripts/kconfig/preprocess.o
HOSTCC scripts/kconfig/symbol.o
HOSTCC scripts/kconfig/lexer.lex.o
HOSTCC scripts/kconfig/parser.tab.o
HOSTLD scripts/kconfig/conf
scripts/kconfig/conf --olddefconfig Kconfig
#
# No change to .config
#
scripts/kconfig/conf --syncconfig Kconfig
{ command -v gcc; } >/dev/null 2>&1 && echo "n" || echo "y": Cannot
allocate memory
make[2]: *** [scripts/kconfig/Makefile:73: syncconfig] Error 1
make[1]: *** [Makefile:584: syncconfig] Error 2
make: *** [Makefile:695: include/config/auto.conf.cmd] Error 2
~/linux-2.6$
PS: unable to compile kernel makes its bisection impossible =(
