Linux kernel compile error elf_x86_64 missing

问题

I'm using Ubuntu Linux 12.04 with the 3.11 kernel.

For my work I have to patch the kernel to make it realtime able.

So I downloaded the Linux 2.6.31.6 kernel with the patch and tried to patch, compile and instal it.

While I try to compile it there comes this error:

CC      arch/x86/vdso/vgetcpu.o
CC      arch/x86/vdso/vvar.o
VDSO    arch/x86/vdso/vdso.so.dbg

gcc: Error: elf_x86_64: File or directory not found
make[2]: *** [arch/x86/vdso/vdso.so.dbg] Error 1
make[1]: *** [arch/x86/vdso] Error 2
make: *** [arch/x86] Error 2

For the compilation of the RT 2.6... kernel I use the same configfile like the 3.11 (with some edited points of course) and I looked into the /arch/x86/vdso directory and the vdso.so.dbg file is missing (and I don't know where to get it).

I hope you can help me and if you need some further informations I will try to provide them.

Yours sincerely Adrian

回答1:

I changed in arch/x86/vdso/Makefile

VDSO_LDFLAGS_vdso.lds = -m elf_x86_64 [...]
...
VDSO_LDFLAGS_vdso32.lds = -m elf_x86 [...]

to

VDSO_LDFLAGS_vdso.lds = -m64 [...]
...
VDSO_LDFLAGS_vdso32.lds = -m32 [...]

回答2:

The problem is how gcc is getting some flags from arch/x86/vdso/Makefile. Replacing the

VDSO_LDFLAGS_vdso.lds = -m elf_x86_64

with

VDSO_LDFLAGS_vdso.lds = -m64

should work.

来源：https://stackoverflow.com/questions/22662906/linux-kernel-compile-error-elf-x86-64-missing