undefined reference to operator new

aaronminner — Tue, 22 Jan 2019 21:00:23 GMT

Using MCUXpresso with SDK 2.5.0 for the K66 processor. Started with a C project that I got to compile, link and execute on the hardware just fine. Added a C++ file to provide support for an external device (SI5351A clock chip). Updated the build process, since it doesn't consider C++ files automatically. Resolved the few syntax errors involved in calling C++ from C. So far, so good. However, in the link stage, I get the following error:

> ... undefined reference to `operator new(unsigned int)'

If I follow the advice from the Internet and add "stdc++" to the link options, I get a list of errors related to exceptions. If I try to add other linkage options to resolve those, I get additional errors. I did clean the project at various stages and build fresh; doesn't seem to make a difference.

Am I overlooking something in incorporating C++ from within a C project in MCUXpresso?

Re: undefined reference to operator new

Alice_Yang — Wed, 23 Jan 2019 06:43:00 GMT

Hello Aaron Minner ,

- First method，In MCUXpresso IDE, you also can create C++ project：

- Second, please check which library your project used, the default lib of SDK demo use Redlib， this library doesn't

support C++. So change it to NewlibNano or Newlib:

Hope it helps,

Have a great day,
TIC

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topic Re: undefined reference to operator new in MCUXpresso General

undefined reference to operator new

Re: undefined reference to operator new