[PATCH] This patch provides usage of RTEMS cross-compiler over GCC cross-compiler

[Gedare Bloom]

On Sun, Mar 22, 2020 at 11:33 AM utkarsh.rai60 at gmail.com
<utkarsh.rai60 at gmail.com> wrote:
>
> Really sorry for a new patch, I somehow rm -rf'ed my machine's root
Oh no!

> ---
>  user/start/tools.rst | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/user/start/tools.rst b/user/start/tools.rst
> index c3f039b..3bb939e 100644
> --- a/user/start/tools.rst
> +++ b/user/start/tools.rst
> @@ -76,3 +76,19 @@ 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 can't use their distribution's cross-compiler for their target on rtems, e.g.,the riscv64-linux-gnu or the arm-none-eabi-gcc. 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.

Fix line length (text width) should be <= 80 characters.

> +
> + ``Threading in GCC support libraries`` -
> +    GCC support threading libraries such as ``pthread.h`` provide threading support to an application; these libraries are tailored according to RTEMS using the RTEMS 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. Multilibs variants to match the BSP are set by selecting a specific set of machine options using the RTEMS cross-compiler.
> --
> 2.17.1
>
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