RTEMS Source Builder | Error associate with libpng while building RSB package in RTEMS 7 (#162)

[Lahiru Gunathilake (@bllgg)]

Lahiru Gunathilake created an issue: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/issues/162



## Summary

While building the RSB package for RTEMS 7 using the following command, according to the [project manual for building an RSB package](https://docs.rtems.org/docs/main/user/start/rsb-packages.html) (The original command was written for RTEMS 5):

```
../source-builder/sb-set-builder --prefix=$HOME/RTEMS/rtems/7 --with-rtems-tests=yes bsps/erc32
```

The build failed during the libpng compilation. The C compiler throws an implicit declaration error for feenableexcept because Newlib for SPARC doesn’t seem to implement it:

```
../libpng-1.6.37/contrib/libtests/pngvalid.c:11662:4: error: implicit declaration of function 'feenableexcept'; did you mean 'feraiseexcept'? [-Wimplicit-function-declaration]
11662 |    feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
      |    ^~~~~~~~~~~~~~
      |    feraiseexcept
```

Discussion: [Link](https://users.rtems.org/t/error-building-rsb-package-in-rtems-7-is-this-workflow-deprecated/674)

## Steps to reproduce

* Go through the [documentation](https://docs.rtems.org/docs/main/user/start/rsb-packages.html)
* Obtain the sources from:
  * https://gitlab.rtems.org/rtems/tools/rtems-source-builder.git
  * https://gitlab.rtems.org/rtems/rtos/rtems.git
* Build the RSB package with

  ```
  ../source-builder/sb-set-builder --prefix=$PREFIX/rtems/7 --with-rtems-tests=yes bsps/erc32
  ```

  instead of using the prefix as $PREFIX/rtems/5
* See the error log in the `PREFIX/src/rsb/rtems/rsb-report-libpng-v1.6.37-sparc-rtems7-1.txt` or something similar to that

-- 
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