Re: [lfs-support] Cant execute dynamically linked binaries on my LFS

[Andrew Benton]

On Fri, 16 Dec 2011 11:53:07 +0530
harish badrinath harishbadrin...@gmail.com wrote:

 What could be wrong ??

Perhaps you made a mistake somewhere in chapter 5. Perhaps you stopped
at some point and when you came back you didn't set up the build
environment correctly? Perhaps, as a result, some of the things
in /mnt/lfs/tools are linked to libraries on your host system. ldd will
show this. All the paths ldd gives should start with /tools. If they
star with /usr or /lib then those things will need to be compiled again.

Andy
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[lfs-support] Cant execute dynamically linked binaries on my LFS

[harish badrinath]

Hello,
I chrooted into my LFS partition and noticed something peculiar, i
cant execute dynamically linked executables.
Note: My PWD is /, inside the chroot

./configure gives
Output
configure: error: cannot run C compiled programs
/Output

So I compiled a toy program
snip
int main () {return 0;}
/snip
and i compiled it using the command:
Compile
cc /tmp/test.c
/Compile

Output
/a.out
/bin/sh: /a.out: not found
/Output

So i statically compile strace, put it in my LFS chroot and i get
Strace
strace /a.out
execve(/a.out, [/a.out], [/* 13 vars */]) = -1 ENOENT (No such
file or directory)
dup(2)  = 3
fcntl64(3, F_GETFL) = 0x2 (flags O_RDWR)
fstat64(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb7776000
_llseek(3, 0, 0xbf8d30ac, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(3, strace: exec: No such file or di..., 40strace: exec: No
such file or directory
) = 40
close(3)= 0
munmap(0xb7776000, 4096)= 0
exit_group(1)   = ?
/Strace

Now I recompile the test program as a static binary

Compile
cc /tmp/test.c -static
/Compile

Output
/a.out
Segmentation fault
/Output

And i get the strace output:
Strace
strace /a.out
execve(/a.out, [/a.out], [/* 13 vars */]) = 0
--- {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0} (Segmentation fault) ---
+++ killed by SIGSEGV +++
Segmentation fault
/Strace

So i install ucibc on my normal machine and try to run the executable,
[NORMAL-MACHINE]$ file /tmp/a.out
/tmp/a.out: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
dynamically linked (uses shared libs), not stripped
[NORMAL-MACHINE]$ gdb /tmp/a.out
snip
and show warranty for details.
This GDB was configured as i486-linux-gnu.
For bug reporting instructions, please see:
http://www.gnu.org/software/gdb/bugs/...
/tmp/a.out: not in executable format: File format not recognized
/snip


What could be wrong ??



Regards,
Harish
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