CentOS 7에서 GLIBC 2.18 사용하기

공유라이브러리 의존관계

• 공유 라이브러리 정보는 ELF 의 동적섹션(.dynamic)에 NEEDED 로 기록되어 있음
• NEEDED 로 표시되어있는 것은 SONAME 이므로, SONAME 으로부터 실제 파일을 찾아야 함.
  • LD_LIBRARY_PATH
  • /etc/ld.so.cache
  • /etc/ld.so.conf
  • ldconfig

$ objdump -p ./httpd
...
Dynamic Section:
  NEEDED               libz.so.1
  NEEDED               libm.so.6
  NEEDED               libaprutil-1.so.0
  NEEDED               libexpat.so.0
  NEEDED               libapr-1.so.0
  NEEDED               librt.so.1
  NEEDED               libcrypt.so.1
  NEEDED               libpthread.so.0
  NEEDED               libc.so.6
  RPATH                /home1/irteam/apps/apache-2.2.34/lib
  INIT                 0x00000000004239b0
  FINI                 0x0000000000489a88
  
# readelf
$ readelf -d ./httpd
Dynamic section at offset 0xb4250 contains 29 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libz.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libaprutil-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libexpat.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libapr-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [librt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libcrypt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000000f (RPATH)              Library rpath: [/home1/irteam/apps/apache-2.2.34/lib]
 0x000000000000000c (INIT)               0x4239b0