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[Matthias Klose <doko@xxxxxxxxxx>]

this seems to work in yakkety. in xenial I get a segfault, but i can't
see the memory hog.


** Also affects: binutils (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: binutils (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1608898

Title:
  ld crash generating map file for c++11 auto return type inference

Status in binutils package in Ubuntu:
  Fix Released
Status in binutils source package in Xenial:
  New

Bug description:
  I'm getting a crash in ld while linking C++-11 auto return type code.
  ld starts madly allocating memory until your memory and swap are
  filled, then seg-faults.  Use ulimit to avoid swap thrashing while
  reproducing:

  $ ulimit -v 2147483648  # 2GB
  $ g++ -Wall -ggdb -O0 --std=c++11 -Werror -Wl,-Map=_timing.map _timing_ld_crash_map.cpp -o _timing
  collect2: fatal error: ld terminated with signal 11 [Segmentation fault], core dumped
  compilation terminated.

  I've reduced the input source which is attached as
  _timing_ld_crash_map.cpp.

  The following changes (on their own) make the problem "go away":

  1. remove -Wl,-Map=...map from the command-line
  2. stepping up to -O1 or higher.  -Og fails must like -O0.  
  3. Making `runTest` `static`

  It seems likely the compiler is emitting a symbol or symbols causing
  binutils to choke during mapfile generation.  Its possible the
  compiler could be partly at fault, but clearly ld shouldn't max out
  the memory.

  Wrapping the body (not the #includes) in #pragma optimisation for -O3
  doesn't fix things so likely the std library symbols in <vector> are
  part of the problem.

  
  $ lsb_release -rd
  Description:	Ubuntu 16.04 LTS
  Release:	16.04

  $ apt-cache policy binutils gcc g++
  binutils:
    Installed: 2.26.1-1ubuntu1~16.04.1
    Candidate: 2.26.1-1ubuntu1~16.04.1
    Version table:
   *** 2.26.1-1ubuntu1~16.04.1 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       2.26-8ubuntu2 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  gcc:
    Installed: 4:5.3.1-1ubuntu1
    Candidate: 4:5.3.1-1ubuntu1
    Version table:
   *** 4:5.3.1-1ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  g++:
    Installed: 4:5.3.1-1ubuntu1
    Candidate: 4:5.3.1-1ubuntu1
    Version table:
   *** 4:5.3.1-1ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

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