linux-kernel - Re: Using a custom LDFLAG for all objects and binaries

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Date:   Sun, 10 May 2020 23:34:20 +0430
From:   Mahmood Naderan <mahmood.nt@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: Using a custom LDFLAG for all objects and binaries

> > or
> > 2- Editing arch/x86/Makefile with
> >    KBUILD_LDFLAGS := -m --emit-relocs elf_$(UTS_MACHINE)
>
> That should work.


Seems not... I ran the following commands:

$ cp -v /boot/config-$(uname -r) .config
$ make menuconfig  -> Exit -> Save
$ vim arch/x86/Makefile
     KBUILD_LDFLAGS := -m --emit-relocs elf_$(UTS_MACHINE)
$ make V=1

This is the error that I get

make -f ./scripts/Makefile.build obj=usr need-builtin=1
/bin/bash ./usr/gen_initramfs_list.sh -l -d > usr/.initramfs_data.cpio.d
(cat /dev/null; ) > usr/modules.order
make -f ./scripts/Makefile.build obj=arch/x86 need-builtin=1
make -f ./scripts/Makefile.build obj=arch/x86/crypto need-builtin=1
make -f ./scripts/Makefile.build obj=arch/x86/crypto/sha1-mb need-builtin=
(cat /dev/null;   echo kernel/arch/x86/crypto/sha1-mb/sha1-mb.ko;) >
arch/x86/crypto/sha1-mb/modules.order
  ld -m --emit-relocs elf_x86_64     -r -o
arch/x86/crypto/sha1-mb/sha1-mb.o arch/x86/crypto/sha1-mb/sha1_mb.o
arch/x86/crypto/sha1-mb/sha1_mb_mgr_flush_avx2.o
arch/x86/crypto/sha1-mb/sha1_mb_mgr_init_avx2.o
arch/x86/crypto/sha1-mb/sha1_mb_mgr_submit_avx2.o
arch/x86/crypto/sha1-mb/sha1_x8_avx2.o
ld: unrecognised emulation mode: --emit-relocs
Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu
i386linux elf_l1om elf_k1om i386pep i386pe
scripts/Makefile.build:516: recipe for target
'arch/x86/crypto/sha1-mb/sha1-mb.o' failed
make[3]: *** [arch/x86/crypto/sha1-mb/sha1-mb.o] Error 1
scripts/Makefile.build:544: recipe for target 'arch/x86/crypto/sha1-mb' failed
make[2]: *** [arch/x86/crypto/sha1-mb] Error 2
scripts/Makefile.build:544: recipe for target 'arch/x86/crypto' failed
make[1]: *** [arch/x86/crypto] Error 2
Makefile:1053: recipe for target 'arch/x86' failed
make: *** [arch/x86] Error 2





ORIGINAL QUESTION:

>Hi
>I would like to modify the kernel makefile in a way to include
>--emit-relocs for every file that is linked during the process of
>kernel make.
>I see
>
>KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
>LDFLAGS_MODULE  =
>LDFLAGS_vmlinux =
>...
>
>But I don't know which one is the main. Should I put that option in
>front of every LD* variable? Or it is possible to apply one variable
>for every file that is linked?
>Appreciate your help.
>


Regards,
Mahmood