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kbuild: use obj-y instead extra-y for objects placed at the head
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. $(AR) mPi needs 'T' to workaround the llvm-ar bug. The fix was suggested by Nathan Chancellor [1]. [1]: https://lore.kernel.org/llvm/[email protected]/ Signed-off-by: Masahiro Yamada <[email protected]> Tested-by: Nick Desaulniers <[email protected]> Reviewed-by: Nicolas Schier <[email protected]>
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Original file line number | Diff line number | Diff line change |
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@@ -45,4 +45,4 @@ obj-$(CONFIG_STMARK2) += stmark2.o | |
obj-$(CONFIG_PCI) += pci.o | ||
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||
obj-y += gpio.o | ||
extra-y := head.o | ||
obj-y += head.o |
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