I am trying to compile a project with Dev-C++ 4.9.9.1, and it compiles ok. When it trys to link, however, I get a huge amount of errors:

[Linker error] undefined reference to `__w32_sharedptr_initialize'
[Linker error] undefined reference to `_Unwind_SjLj_Register'
[Linker error] undefined reference to `_Unwind_SjLj_Resume'
[Linker error] undefined reference to `_Unwind_SjLj_Unregister'
[Linker error] undefined reference to `_Unwind_SjLj_Register'
[Linker error] undefined reference to `_Unwind_SjLj_Resume'
[Linker error] undefined reference to `_Unwind_SjLj_Unregister'
[Linker error] undefined reference to `_Unwind_SjLj_Register'
[Linker error] undefined reference to `_Unwind_SjLj_Resume'
[Linker error] undefined reference to `_Unwind_SjLj_Unregister'
[Linker error] undefined reference to `_Unwind_SjLj_Register'
[Linker error] undefined reference to `_Unwind_SjLj_Resume'
[Linker error] undefined reference to `_Unwind_SjLj_Unregister'

and so on...
What is causing this and how can I fix it?

When I see messages about "unwind" stuff, I think maybe it's using a C++ compiler/linker on a C program (C source language would (probably) be ok with a C++ compiler, but they are linked differently due to function name mangling features of c++).

Here's a plan of attack:

Create a C++ console project. Something simple (hello world). Make sure the source file is main.cpp (or something.cpp). Compile, link, and execute.

Create a C console project. Something simple (hello world). Make sure tha source file is main.c (or something.c). Compile, link, and execute.

If you can do both of these steps, then look at your project: is it C or C++?
Are source files named .c or .cpp?
Make them compatible with the project type.

If nothing here helps, then tell us a little more about your project: console or GUI? C or C++? File names? Header names? What headers are you #include' ing? Etc. If it's not really huge, post the code.

Regards,

Dave