Berawal ketika saya memperbarui ruby ke ruby-2.1.6 dan racc ke racc-1.4.11, saya mendapati error saat saya membangun racc dengan target RUBY_TARGETS="ruby21" berupa invalid ELF header pada libz.so.1.
# cat /var/tmp/portage/dev-ruby/racc-1.4.11/work/ruby21/racc-1.4.11/ext/racc/mkmf.log
"x86_64-pc-linux-gnu-gcc -o conftest -I/usr/include/ruby-2.1.0/x86_64-linux -I/usr/include/ruby-2.1.0/ruby/backward -I/usr/include/ruby-2.1.0 -I. -march=native -O2 -fno-strict-aliasing -fPIC conftest.c -L. -L/usr/lib64 -L. -Wl,-O1 -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic -Wl,--no-undefined -lruby21 -lpthread -lgmp -ldl -lcrypt -lm -lc"
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.8.4/cc1: error while loading shared libraries: /usr/lib64/libz.so.1: invalid ELF header
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5: return 0;
6: }
/* end */
Ok, apa yang terjadi?
$ ls -l /usr/lib64/libz*
-rwxr-xr-x 1 root root 88456 Mar 17 22:13 /usr/lib64/libz.so
lrwxrwxrwx 1 root root 7 Mar 17 22:13 /usr/lib64/libz.so.1 -> libz.so
$ readelf -h /usr/lib64/libz.so
readelf: Error: Unable to read in 0x7964 bytes of section headers
readelf: Error: Not an ELF file - it has the wrong magic bytes at the start
libz.so di /usr/lib64/libz.so tidak dianggap sebagai berkas ELF. Berbeda dengan libz.so yang ada di /lib64.
$ ls -l /lib64/libz*
lrwxrwxrwx 1 root root 13 Mar 17 23:29 /lib64/libz.so.1 -> libz.so.1.2.8
-rwxr-xr-x 1 root root 88456 Mar 17 23:29 /lib64/libz.so.1.2.8
$ readelf -h /lib64/libz.so.1.2.8
ELF Header:
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: DYN (Shared object file)
Machine: Advanced Micro Devices X86-64
Version: 0x1
Entry point address: 0x2360
Start of program headers: 64 (bytes into file)
Start of section headers: 86792 (bytes into file)
Flags: 0x0
Size of this header: 64 (bytes)
Size of program headers: 56 (bytes)
Number of program headers: 7
Size of section headers: 64 (bytes)
Number of section headers: 26
Section header string table index: 25
Masalah sudah jelas! Saatnya copy-kan /lib64/libz.so.1.2.8 ke /usr/lib64/libz.so.
# cp /lib64/libz.so.1.2.8 /usr/lib64/libz.so
Taraa! Kompilasi lancar dan bisa dilanjutkan.