With a new custom compiled, builded version of glibc/libc.so, what happens during a “relocation has invalid symbol index” error?

Question

From the link, I would like to compile a new glibc by myself. I know that compiling a glic is difficult, so on my first step, I would like to comiple a new glibc that match the exact same version already running on my linux system. I can skip toolchain dependency checking and start to focus on the glic iteself.

My ubuntu info is like:

    abbott@abbott-VirtualBox:/software/glibc/code$ uname -a
    Linux abbott-VirtualBox 4.4.0-31-generic #50~14.04.1-Ubuntu SMP Wed Jul 13 01:07:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
    abbott@abbott-VirtualBox:/software/glibc/code$ lsb_release -a
    No LSB modules are available.
    Distributor ID: Ubuntu
    Description:    Ubuntu 14.04.5 LTS
    Release:    14.04
    Codename:   trusty

The already existed glibc is: 2.19. check the version like:

abbott@abbott-VirtualBox:/software/glibc/code$ ldd --version
ldd (Ubuntu EGLIBC 2.19-0ubuntu6.9) 2.19

I prepare a very simple c code for testing:

#include <stdio.h>
int main(){
        long z; printf("Long int size is %i bytes long!\n", sizeof(z)); 
        return 0;
}

I compile this code using the already existed gcc,

gcc simple.c

I goe the "a.out", it's ok. it's runnable it's wonderful:

abbott@abbott-VirtualBox:/software/glibc/code$ ldd a.out
    linux-vdso.so.1 =>  (0x00007ffceaf0b000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1a66f64000)
    /lib64/ld-linux-x86-64.so.2 (0x000055b9118c7000)

So, I download from here, I choose the "glibc-2.19.tar.gz".

I put the source at /software/glibc/glibc-2.19

compile at /software/glibc/compile-2.19

compile result is OK:

abbott@abbott-VirtualBox:/software/glibc/compile-2.19$ ../glibc-2.19/configure -prefix=/usr
abbott@abbott-VirtualBox:/software/glibc/compile-2.19$ make

In the "compile-2.19" folder, there is a testrun.sh shell code, I follow the "Compile normally, run under new glibc" section in the link, it's ok, it works.

abbott@abbott-VirtualBox:/software/glibc/compile-2.19$ ./testrun.sh ../code/a.out

I follow the "Compile against glibc build tree" section in the link,

GLIBC=/software/glibc/compile-2.19

gcc \
  -Wl,-rpath=${GLIBC}:\
${GLIBC}/math:\
${GLIBC}/elf:\
${GLIBC}/dlfcn:\
${GLIBC}/nss:\
${GLIBC}/nis:\
${GLIBC}/rt:\
${GLIBC}/resolv:\
${GLIBC}/crypt:\
${GLIBC}/nptl:\
${GLIBC}/dfp \
  -Wl,--dynamic-linker=${GLIBC}/elf/ld.so
  -o myligcsimple simple.c

It output:

/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 0 has invalid symbol index 11
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 1 has invalid symbol index 12
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 2 has invalid symbol index 2
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 3 has invalid symbol index 2
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 4 has invalid symbol index 11
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 5 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 6 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 7 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 8 has invalid symbol index 12
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 9 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 10 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 11 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 12 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 13 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 14 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 15 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 16 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 17 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 18 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 19 has invalid symbol index 21
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_line): relocation 0 has invalid symbol index 2
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status

I googled for several days, I cound not find the answers. some says that the main func is missing. but I have the main func, and the code works fine with the already existed glibc.

Question 1:

Would anybody help to find out how to fix the problem?

/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 0 has invalid symbol index 11

The instructions you link to are followed by "Please note that such a compilation does not make use of new headers or C runtime objects i.e. `crt1.o`, `crti.o`, and `crtn.o` provided by glibc. Changes made to headers or objects require a more complex compilation, see later instructions for the details." Given that the error reports your system `crt1.o`, my first thought would be to follow those later instructions. — , Sep 09 '18 at 09:06
Thanks for your replay, But I think it's a choose, not a must step. — gfan, Sep 09 '18 at 09:19
Thanks for you replay, I use the piece of shell code in "thos later instructions", It gives me some idea. I need more time to dig into. very thanks. — gfan, Sep 09 '18 at 13:01

score 0 · Answer 1 · answered Sep 09 '18 at 18:29

0

I follow the "Compile against glibc build tree" section in the link, ... /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info)

Under no circumstances should your link use any objects from /usr/lib/debug/, and the command line arguments you show will certainly not cause that to happen. See also this answer.

Therefore, it is likely that you are not telling the whole story. Perhaps you've modified some environment variables, or the GCC driver, or you are not showing the actual command you used.

answered Sep 09 '18 at 18:29

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Thanks for your replay, That's the whole cmd I run. I didn't modify anything intentionally. maybe something changed andy I ignored. I read you answer of your link, but I don't think I get the point. – gfan Sep 10 '18 at 01:05

With a new custom compiled, builded version of glibc/libc.so, what happens during a “relocation has invalid symbol index” error?

1 Answers1