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From: "james1479 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/62186] New: segfault on map.insert
Date: Tue, 19 Aug 2014 12:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62186

            Bug ID: 62186
           Summary: segfault on map.insert
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: james1479 at gmail dot com

Getting a segfault on map.insert if called as a global initialiser from another
source file.

#### a.cpp    ####
#include <map>

std::map<int, int> m;

int g() {
    m.insert( std::pair<int,int>(1,1) );
    return 0;
}
#### main.cpp #### 
int g(int i);
int a = g(1);

int main() { return 0; }
##################

This code either works or segfaults depending on which order they are passed to
g++:
% g++ a.cpp main.cpp
% ./a.out 
% g++ main.cpp a.cpp
% ./a.out 
[1]    9548 segmentation fault (core dumped)  ./a.out

This also happens if they are compiled to .o files and linked together:
% g++ -c a.cpp 
% g++ -c main.cpp
% g++ a.o main.o 
% ./a.out 
% g++ main.o a.o
% ./a.out
[1]    10485 segmentation fault (core dumped)  ./a.

The program works if compiled as a single source program. 

Or if `int a = g(1);` is moved inside the main function.

Or if m.clear() is called before the insert.

g++ version (from archlinux repo):
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.1/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /build/gcc/src/gcc-4.9.1/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch
--disable-libssp --enable-gnu-unique-object --enable-linker-build-id
--enable-cloog-backend=isl --disable-isl-version-check
--disable-cloog-version-check --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu --disable-multilib
--disable-werror --enable-checking=release
Thread model: posix
gcc version 4.9.1 (GCC)