i built a project in the debug status sucessfully, but i was failed to build it in the release status with a error :
Linking /User/admin/.../MyProgram (1 error)
undefined symbols: __error()
collect2:ld return 1 exit status.
There must be something i forgot.:blink:Please give me a advice.Thank u.

SDK mixup maybe? Mixing GCC 3 and GCC 4 code? That's a very peculiar error!

In fact, i always use GCC 4.0.My project is a C++ command_line with a Carbon static library.