CODEWITHSUNDEEP
c++segmentation-fault
Jim
Jim

Reputation: 51

Why am I getting a segmentation fault?

I am trying to compile a simple hello world function in c++. After I compile it, I run it and get "Segmentation fault". Can someone shed some light on this?

I am compiling this from a Linux command line using the following command:

g++ hello.cpp

#include <iostream>

using namespace std;

int main()
{
    cout << "Hello World!" << endl;
    return 0;
}

Upvotes: 5

Views: 5030

Answers (5)

hedzr
hedzr

Reputation: 183

It's late but might useful:

A simple cxx program compiled runs with core dump / segment fault, the reasons could be:

  • broken gcc installation, broken .so links (libstdc++.so ...)

This commonly happens in the gcc installation is compiled from source.

The workaround is preloading the right lib64/ folder via LD_LIBRARY_PATH:

LD_LIBRARY_PATH=YOUR_GCC_INSTALLATION/lib64 ./hello
# Or
LD_LIBRARY_PATH=YOUR_GCC_INSTALLATION/lib64/libstdc++.so ./hello

If so, put the definition as system wide:

sudo echo "LD_LIBRARY_PATH=YOUR_GCC_INSTALLATION/lib64" >/etc/profile.d/your_gcc

and reboot.

Upvotes: 0

Murali
Murali

Reputation: 1516

Compile it like this

g++ -Bstatic -static hello.cpp

and then run ./a.out

If this doesn't seg fault, LD_LIBRARY_PATH is your culprit.

Upvotes: 1

Stefano Borini
Stefano Borini

Reputation: 143755

There's nothing wrong with that code, so you will have to investigate first your compiler, then your hardware.

Upvotes: 1

Martin B
Martin B

Reputation: 24130

The program itself looks OK. I would guess there's some quirk in your compilation environment that is causing the segfault.

Your best bet is to run this in the debugger (gdb) -- that will tell you where it's crashing, which will help you figure out what the problem is.

To do this, compile like this:

g++ -g -o hello hello.cpp

then run gdb:

gdb hello

and at the gdb prompt type

run

to run the program. When it crashes, type

bt

which will give you a stacktrace that will -- hopefully -- help you figure out what's going on.

Upvotes: 6

Viktor Sehr
Viktor Sehr

Reputation: 13099

This might be a longshot, but try to change int main() to int main(int argc, char *argv[])

Upvotes: 0

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