Really sorry for a new patch, I somehow rm -rf'ed my machine's root --- 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. + + ``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 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
