v01d commented on pull request #3589:
URL: https://github.com/apache/incubator-nuttx/pull/3589#issuecomment-828079445
> No, your understanding is not quite correct. In the FLAT build, only one
copy of the libraries is built. The OS and the applications link to the same
libraries. For example, libs/libc builds libc.a for both the applications and
the OS code. Sorry, I didn't clarify: my question regarding *KERNEL* was for
FLAT mode. I noticed looking at |LibTargets.mk| that libs, mm and libapps do
not ever receive the KDEFINE flags, while other libs do.
> I don't think __KERNEL__ does anything in the FLAT build.
Oh ok. In my case I had an issue with these lines in `stdlib.h` when
building the C++ library:
```c
/* System() command is not implemented in the NuttX libc because it is so
* entangled with shell logic. There is an experimental version at
* apps/system/system. system() is prototyped here, however, for
* standards compatibility.
*/
#ifndef __KERNEL__
int system(FAR const char *cmd);
#endif
```
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