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kbuild: use obj-y instead extra-y for objects placed at the head

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The objects placed at the head of vmlinux need special treatments:

 - arch/$(SRCARCH)/Makefile adds them to head-y in order to place
   them before other archives in the linker command line.

 - arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of
   obj-y to avoid them going into built-in.a.

This commit gets rid of the latter.

Create vmlinux.a to collect all the objects that are unconditionally
linked to vmlinux. The objects listed in head-y are moved to the head
of vmlinux.a by using 'ar m'.

With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-y
for builtin objects.

There is no *.o that is directly linked to vmlinux. Drop unneeded code
in scripts/clang-tools/gen_compile_commands.py.

$(AR) mPi needs 'T' to workaround the llvm-ar bug. The fix was suggested
by Nathan Chancellor [1].

[1]: https://lore.kernel.org/llvm/YyjjT5gQ2hGMH0ni@dev-arch.thelio-3990X/

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
This commit is contained in:
Masahiro Yamada
2022-09-25 03:19:14 +09:00
parent 4b09865900
commit 3216484550
29 changed files with 91 additions and 113 deletions
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19
scripts/clang-tools/gen_compile_commands.py
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@@ -109,20 +109,6 @@ def to_cmdfile(path):
return os.path.join(dir, '.' + base + '.cmd')
def cmdfiles_for_o(obj):
"""Generate the iterator of .cmd files associated with the object
Yield the .cmd file used to build the given object
Args:
obj: The object path
Yields:
The path to .cmd file
"""
yield to_cmdfile(obj)
def cmdfiles_for_a(archive, ar):
"""Generate the iterator of .cmd files associated with the archive.
@@ -211,13 +197,10 @@ def main():
for path in paths:
# If 'path' is a directory, handle all .cmd files under it.
# Otherwise, handle .cmd files associated with the file.
# Most of built-in objects are linked via archives (built-in.a or lib.a)
# but some objects are linked to vmlinux directly.
# built-in objects are linked via vmlinux.a
# Modules are listed in modules.order.
if os.path.isdir(path):
cmdfiles = cmdfiles_in_dir(path)
elif path.endswith('.o'):
cmdfiles = cmdfiles_for_o(path)
elif path.endswith('.a'):
cmdfiles = cmdfiles_for_a(path, ar)
elif path.endswith('modules.order'):