On Fri, Apr 3, 2020 at 11:19 AM utkarsh.ra...@gmail.com <utkarsh.ra...@gmail.com> wrote: > > --- > user/start/tools.rst | 32 ++++++++++++++++++++++++++++++++ > 1 file changed, 32 insertions(+) > > diff --git a/user/start/tools.rst b/user/start/tools.rst > index c3f039b..c1cd141 100644 > --- a/user/start/tools.rst > +++ b/user/start/tools.rst > @@ -76,3 +76,35 @@ source code used. > > > Add ``--verbose`` to the GCC command for the the verbose version details. > + > +Need for RTEMS-Specific Cross-Compiler > +--------------------------------------------------------- > + > +New users are often confused as to why they cannot use their distribution's > +cross-compiler for their target on rtems, e.g., the riscv64-linux-gnu or the > +arm-none-eabi-gcc on RTEMS. Below mentioned are some of the reasons for using > +the RTEMS cross-compiler. > + > +* ``Correct configuration of Newlib -`` The only question I have is whether we need this ``... -`` formatting? Does it add much value
> + Newlib is a C standard library implementation intended for use on > embedded > + systems. Most of the POSIX and libc support for RTEMS is derived from > + Newlib. The RTEMS cross-compiler configures Newlib correctly for RTEMS. > + > +* ``Threading in GCC support libraries -`` > + Several threading packages in GCC such as Go threads (libgo), OpenMP > + (libgomp), and OpenACC need to be customized according to RTEMS. This is > + done by the RTEMS specific cross-compiler. > + > +* ``Provide preprocessor define __rtems__ -`` > + The ``__rtems__`` preprocessor define is used to provide conditional > code > + compilation in source files that are shared with other projects e.g. in > + Newlib or imported code from FreeBSD. > + > +* ``Multilib variants to match the BSP -`` > + RTEMS configures GCC to create separate runtime libraries for each > + supported instruction set, floating point unit, vector unit, word size > + (e.g. 32-bit and 64-bit), endianness, ABI, processor errata workarounds, > + and so on in the architecture. These libraries are termed as > :ref:`Multilib > + <TargetArchitectures>` variants. Multilib variants to match the BSP are > set > + by selecting a specific set of machine options using the RTEMS > + cross-compiler. > -- > 2.17.1 > > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
