[Bug 875474] Re: gcc-4.6: Undefined references when using -flto

[Vladimir Kolesnikov]

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https://bugs.launchpad.net/bugs/875474

Title:
  gcc-4.6: Undefined references when using -flto

Status in “gcc-defaults” package in Ubuntu:
  New

Bug description:
  Steps to reproduce:

  $ sudo pbuilder create
  $ sudo pbuilder --login
  # apt-get install gcc-4.5 gcc libssl-dev
  # cat test.c
  #include <openssl/ssl.h>

  int main(void)
  {
          SSL_library_init();
          return 0;
  }

  # gcc test.c -flto -lcrypto -lssl
  /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libssl.so: undefined reference to `BIO_pop at OPENSSL_1.0.0'
  /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libssl.so: undefined reference to `EVP_CipherInit_ex at OPENSSL_1.0.0'
  /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libssl.so: undefined reference to `BUF_memdup at OPENSSL_1.0.0'
  ... a lot of undefined references...

  Same without -flto:

  # gcc test.c -lcrypto -lssl
  # ls a.out
  a.out

  This seems to be a bug introduced in gcc 4.6 as this succeeds:

  # gcc-4.5 -flto test.c -lcrypto -lssl

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gcc 4:4.6.1-2ubuntu5
  ProcVersionSignature: Ubuntu 3.0.0-12.20-server 3.0.4
  Uname: Linux 3.0.0-12-server x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Sat Oct 15 21:17:59 2011
  ProcEnviron:
   LANGUAGE=en
   SHELL=/bin/bash
   LANG=ru_UA.UTF-8
  SourcePackage: gcc-defaults
  UpgradeStatus: Upgraded to oneiric on 2011-08-21 (54 days ago)

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