DuaneSkelton opened a new pull request, #6860:
URL: https://github.com/apache/incubator-nuttx/pull/6860
## Summary
Added a call to uname() from a c++ application and got a linker error for
undefined reference to uname()
```bash
LD: nuttx
arm-none-eabi-ld:
/home/local/KYMETA/dskelton/github-forks/nuttx/staging/libapps.a(helloxx_main.cxx.home.local.KYMETA.dskelton.github-forks.apps.examples.helloxx.o):
in function `helloxx_main':
helloxx_main.cxx:(.text.helloxx_main+0x42): undefined reference to
`uname(utsname*)'
make[1]: *** [Makefile:159: nuttx] Error 1
make[1]: Leaving directory
'/home/local/KYMETA/dskelton/github-forks/nuttx/arch/arm/src'
make: *** [tools/Unix.mk:509: nuttx] Error 2
```
Found that the uname() function was part of the libc.a generated by our
project and investigated this header file and found that it was not set up to
allow linkage from a c++ file. Also noticed that this was the only header in
the include/sys folder with no extern C {} wrapper for function prototypes.
## Impact
Unable to call uname() from a c++ program
## Testing
This change, when applied to our product code, compiled cleanly and the
uname() API worked as expected.
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