[Bug 1413474] Re: -fsanitize=thread fails to link; needs -ltsan

[Launchpad Bug Tracker]

This bug was fixed in the package gcc-5 - 5.3.1-11ubuntu1

---------------
gcc-5 (5.3.1-11ubuntu1) xenial; urgency=medium

  * Update to SVN 20160311 (r234142, 5.3.1) from the gcc-5-branch.
    - Fix PR tree-optimization/69666, PR middle-end/69920, PR c++/67364.
  * Update the ibm branch to 20160310. LP: #1554644.
  * When configured to link with --as-needed by default, always link the
    sanitizer libraries with --no-as-needed. LP: #1413474

gcc-5 (5.3.1-11) unstable; urgency=medium

  [ Matthias Klose ]
  * Update to SVN 20160307 (r234017, 5.3.1) from the gcc-5-branch.
    - s390x backend backports.
    - Fix PR target/69625 (s390x), PR other/69006, PR tree-optimization/69776,
      PR c++/67364, PR c++/68049, PR target/65932 (ARM32),
      PR target/67714 (ARM32), PR target/70059 (x86), PR rtl-optimization/70007,
      PR tree-optimization/69740, PR tree-optimization/69740, PR c++/67364,
      PR c++/51406, PR c++/67364, PR c++/69261, PR c++/68087, PR c++/67104,
      PR c++/51489, PR c++/69995, PR c++/69995, PR c++/65985.
  * Fix m68k packaging typo. Closes: #815895.
  * Remove powerpcspe specific patch, integrated upstream. Closes: #816048.

  [ Svante Signell ]
  * patches/ada-hurd.diff: Update. Closes: #815967.

 -- Matthias Klose <doko at ubuntu.com>  Fri, 11 Mar 2016 16:56:02 +0100

** Changed in: gcc-5 (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1413474

Title:
  -fsanitize=thread fails to link; needs -ltsan

Status in gcc-5 package in Ubuntu:
  Fix Released

Bug description:
  When passing -fsanitize=thread to gcc, it fails to pass -ltsan through
  to the linker, causing linking to fail.

  For example:
  > gcc -std=c99 -fsanitize=thread -fPIC -pie -o epoll_test epoll_test.c 
  /tmp/cc8yFwPg.o: In function `main':
  epoll_test.c:(.text+0x30): undefined reference to `__tsan_func_entry'
  epoll_test.c:(.text+0x58): undefined reference to `__tsan_write4'
  epoll_test.c:(.text+0x6b): undefined reference to `__tsan_read4'
  epoll_test.c:(.text+0x7e): undefined reference to `__tsan_write4'
  epoll_test.c:(.text+0x8d): undefined reference to `__tsan_read4'
  epoll_test.c:(.text+0xd1): undefined reference to `__tsan_read4'
  epoll_test.c:(.text+0x155): undefined reference to `__tsan_read4'
  epoll_test.c:(.text+0x1b0): undefined reference to `__tsan_read4'
  epoll_test.c:(.text+0x20b): undefined reference to `__tsan_read4'
  /tmp/cc8yFwPg.o:epoll_test.c:(.text+0x231): more undefined references to `__tsan_read4' follow
  /tmp/cc8yFwPg.o: In function `main':
  epoll_test.c:(.text+0x383): undefined reference to `__tsan_func_exit'
  /tmp/cc8yFwPg.o: In function `_GLOBAL__sub_I_00099_0_epoll_test.c':
  epoll_test.c:(.text+0x3ac): undefined reference to `__tsan_init'
  collect2: error: ld returned 1 exit status

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: gcc 4:4.9.2-1ubuntu1
  ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2
  Uname: Linux 3.18.0-9-generic x86_64
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Jan 22 16:13:08 2015
  InstallationDate: Installed on 2013-08-06 (533 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  SourcePackage: gcc-defaults
  UpgradeStatus: Upgraded to vivid on 2013-08-06 (533 days ago)

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