C++ program does not run in Code::Blocks

Question

While doing programming in Code::Blocks it compiles well for C but not for C++. Even for a "Hello World" program:

#include <iostream>

using namespace std;

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

it gives these errors:

-------------- Build: Debug in project ---------------

    Compiling: main.cpp
    Linking console executable: bin\Debug\project.exe
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_throw.o):eh_throw.cc:(.text+0x7b): undefined reference to `__w32_sharedptr_unexpected'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_throw.o):eh_throw.cc:(.text+0x8c): undefined reference to `__w32_sharedptr_terminate'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_globals.o):eh_globals.cc:(.text+0x4e): undefined reference to `__w32_sharedptr'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_globals.o):eh_globals.cc:(.text+0xb9): undefined reference to `__w32_sharedptr'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_globals.o):eh_globals.cc:(.text+0x179): undefined reference to `__w32_sharedptr'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_globals.o):eh_globals.cc:(.text+0x186): undefined reference to `__w32_sharedptr'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_globals.o):eh_globals.cc:(.text+0x1e3): undefined reference to `__w32_sharedptr'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_globals.o):eh_globals.cc:(.text+0x1ef): more undefined references to `__w32_sharedptr' follow
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_terminate.o):eh_terminate.cc:(.text+0x67): undefined reference to `__w32_sharedptr_terminate'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_terminate.o):eh_terminate.cc:(.text+0x97): undefined reference to `__w32_sharedptr_unexpected'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_terminate.o):eh_terminate.cc:(.text+0xb3): undefined reference to `__w32_sharedptr_terminate'
    C:\Program Files (x86)\CodeBlocks\MinGW\lib/libstdc++.a(eh_terminate.o):eh_terminate.cc:(.text+0xd3): undefined reference to `__w32_sharedptr_unexpected'
    collect2: ld returned 1 exit status
    Process terminated with status 1 (0 minutes, 1 seconds)
    12 errors, 0 warnings

#include <iostream> using namespace std; int main() { cout << "Hello world!" << endl; return 0; } — Prajwal Acharya
– Prajwal Acharya, Commented Nov 3, 2011 at 7:48
Edit your question. Once you've put the code in, use ctrl-K to make it look like code. — Moo-Juice
– Moo-Juice, Commented Nov 3, 2011 at 7:54

greatwolf · Accepted Answer · 2011-11-03 09:03:21Z

4

The errors you're getting indicate that the linker is having trouble locating __w32_sharedptr which is probably a dependency libstdc++ needs to work.

Normally the standard library and any dependencies it needs are linked in automatically when you build your project. However, as trojanfoe's comment indicates this is only true if you're compiling with g++. If you're building C++ code with gcc, the C++ standard library won't get included automatically since the gcc driver thinks it's compiling C code.

To verify what's actually happening in your codeblocks setup go to Settings->Compiler and Debugger->Global compiler settings(on the left)->under Toolchain executables tab. You should see something similar to this:

enter image description here

If your setup looks right but still refuses to build properly, enable full compiler logging and see what commands are actually being invoked by the IDE. You can find this under Global compiler settings->Other settings tab-> Compiler Log = Full command line. Note you might have to scroll a bit to the right to find the tab.

With full logging enabled, rebuild your project again and update your question with the commands used.

This is approximately what you should see in the log window when you rebuilt with the above options turned on:

enter image description here

edited Nov 3, 2011 at 9:03

answered Nov 3, 2011 at 8:35

greatwolf

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6 Comments

Prajwal Acharya Over a year ago

My set up looks right as u have guided. It used to work but after I installed SDL library in my codeblock, the program gives me this such of trouble. Is it because of the SDL Library..??

greatwolf Over a year ago

@PrajwalAcharya Did you enable full logging in that case? What does the log window show when you try to build? The full commandline used to build will show up there when you enable full logging.

Prajwal Acharya Over a year ago

log windows this time too shows same as above..?? Will reinstalling codeblocks solve this..?? I can probably reinstall SDL Library too..!!!

greatwolf Over a year ago

@PrajwalAcharya If you're seeing the same thing as before then you didn't enable full commandline logging. I updated my answer to show you how it should look like.

Prajwal Acharya Over a year ago

Finally Finally I got out of that problem thank you @Victor Now it worked and is running c++ programs too..!!!

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