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kbuild: handle libs-y archives separately from built-in.o archives

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The thin archives build currently puts all lib.a and built-in.o
files together and links them with --whole-archive.

This works because thin archives can recursively refer to thin
archives. However some architectures include libgcc.a, which may
not be a thin archive, or it may not be constructed with the "P"
option, in which case its contents do not get linked correctly.

So don't pull .a libs into the root built-in.o archive. These
libs should already have symbol tables and indexes built, so they
can be direct linker inputs. Move them out of the --whole-archive
option, which restore the conditional linking behaviour of lib.a
to thin archives builds.

Signed-off-by: Nicholas Piggin <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>
This commit is contained in:
Nicholas Piggin 2017-06-20 01:52:05 +10:00 • committed by Masahiro Yamada
commit 3a166fc2d4
3 changed files with 46 additions and 15 deletions
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8
Documentation/kbuild/kbuild.txt
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@ -236,5 +236,9 @@ Files specified with KBUILD_VMLINUX_INIT are linked first.
KBUILD_VMLINUX_MAIN
--------------------------------------------------
All object files for the main part of vmlinux.
KBUILD_VMLINUX_INIT and KBUILD_VMLINUX_MAIN together specify
all the object files used to link vmlinux.
KBUILD_VMLINUX_LIBS
--------------------------------------------------
All .a "lib" files for vmlinux.
KBUILD_VMLINUX_INIT, KBUILD_VMLINUX_MAIN, and KBUILD_VMLINUX_LIBS together
specify all the object files used to link vmlinux.