linux-toradex.git/scripts/Makefile.build, branch v5.9-rc6

kbuild: sort hostprogs before passing it to ifneq

2020-08-09T16:32:59+00:00

The conditional:

  ifneq ($(hostprogs),)

... is evaluated to true if $(hostprogs) does not contain any word but
whitespace characters.

  ifneq ($(strip $(hostprogs)),)

... is a safe way to avoid interpreting whitespace as a non-empty value,
but I'd rather want to use the side-effect of $(sort ...) to do the
equivalent.

$(sort ...) is used in scripts/Makefile.host in order to drop duplication
in $(hostprogs). It is also useful to strip excessive spaces.

Move $(sort ...) before evaluating the ifneq.

Signed-off-by: Masahiro Yamada

kbuild: move host .so build rules to scripts/gcc-plugins/Makefile

2020-08-09T16:32:59+00:00

The host shared library rules are currently implemented in
scripts/Makefile.host, but actually GCC-plugin is the only user of
them. (The VDSO .so files are built for the target by different
build rules) Hence, they do not need to be treewide available.

Move all the relevant build rules to scripts/gcc-plugins/Makefile.

I also optimized the build steps so *.so is directly built from .c
because every upstream plugin is compiled from a single source file.

I am still keeping the multi-file plugin support, which Kees Cook
mentioned might be needed by out-of-tree plugins.
(https://lkml.org/lkml/2019/1/11/1107)

If the plugin, foo.so, is compiled from two files foo.c and foo2.c,
then you can do like follows:

  foo-objs := foo.o foo2.o

Single-file plugins do not need the *-objs notation.

Signed-off-by: Masahiro Yamada 
Acked-by: Kees Cook

kbuild: always create directories of targets

2020-08-09T16:32:58+00:00

Currently, the directories of objects are automatically created
only for O= builds.

It should not hurt to cater to this for in-tree builds too.

Signed-off-by: Masahiro Yamada

kbuild: run the checker after the compiler

2020-07-07T02:13:10+00:00

Since the pre-git time the checker is run first, before the compiler.
But if the source file contains some syntax error, the warnings from
the compiler are more useful than those from sparse (and other
checker most probably too).

So move the 'check' command to run after the compiler.

Signed-off-by: Luc Van Oostenryck 
Signed-off-by: Masahiro Yamada

kbuild: update modules.order only when contained modules are updated

2020-06-03T04:22:17+00:00

Make modules.order depend on $(obj-m), and use if_changed to build it.
This will avoid unneeded update of modules.order, which will be useful
to optimize the modpost stage.

Currently, the second pass of modpost is always invoked. By checking the
timestamp of modules.order, we can avoid the unneeded modpost.

Signed-off-by: Masahiro Yamada

kbuild: refactor tagets caluculation for KBUILD_{BUILTIN,KBUILD_MODULES}

2020-06-01T12:50:46+00:00

Remove lib-target, builtin-target, modorder-target, and modtargets.

Instead, add targets-for-builtin and targets-for-modules.

Signed-off-by: Masahiro Yamada

kbuild: make modules.order rule consistent with built-in.a

2020-05-25T15:03:16+00:00

built-in.a contains the built-in object paths from the current and sub
directories.

module.order collects the module paths from the current and sub
directories.

Make their build rules look more symmetrical.

Signed-off-by: Masahiro Yamada

kbuild: rename subdir-obj-y to subdir-builtin

2020-05-25T15:03:16+00:00

I think subdir-builtin is clearer.

While I was here, I made its build rule explicit.

Signed-off-by: Masahiro Yamada

kbuild: move subdir-obj-y to scripts/Makefile.build

2020-05-25T15:03:16+00:00

Save $(addprefix ...) for subdir-obj-y.

Signed-off-by: Masahiro Yamada

kbuild: clear KBUILD_MODULES in top Makefile if CONFIG_MODULES=n

2020-05-25T15:03:16+00:00

Do not try to build any module-related artifacts when CONFIG_MODULES
is disabled.

Signed-off-by: Masahiro Yamada