On Fri, Apr 3, 2020 at 8:15 AM Chris Johns <chr...@rtems.org> wrote: > On 2020-03-28 00:13, utkarsh.ra...@gmail.com wrote: > > --- > > user/start/tools.rst | 34 ++++++++++++++++++++++++++++++++++ > > 1 file changed, 34 insertions(+) > > > > diff --git a/user/start/tools.rst b/user/start/tools.rst > > index c3f039b..8ea1f64 100644 > > --- a/user/start/tools.rst > > +++ b/user/start/tools.rst > > @@ -3,6 +3,7 @@ > > .. Copyright (C) 2019 embedded brains GmbH > > .. Copyright (C) 2019 Sebastian Huber > > .. Copyright (C) 2020 Chris Johns > > +.. Copyright (C) 2020 Utkarsh Rai > > > > .. _QuickStartTools: > > > > @@ -76,3 +77,36 @@ source code used. > > > > > > Add ``--verbose`` to the GCC command for the the verbose version > details. > > + > > + > > +Need for RTEMS-Specific Cross-Compiler > > +-------------------------------------------- > > Length of ---'s does not match the heading. > > > + > > +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 -`` > > + 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 multilib > variants > > + ( > https://docs.rtems.org/branches/master/user/hardware/architectures.html?highlight=multilib > ). > > Please do not add external links to internal parts of the same document. > Please use :ref: to do this. A link like this breaks on branches and PDFs. > > Would it be ok to just add reference to the architecture section of the doc?
> Chris > > > + Multilibs variants to match the BSP are set by selecting a > specific set of > > + machine options using the RTEMS cross-compiler. > > >
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