1ae43935fd
The sim/src/nuttx-names.in symbol-rename list is the mechanism that
keeps every nuttx libc function used inside nuttx.rel from clashing
with the same-named function in host glibc when the sim executable
is finally linked. The list already covers ~200 symbols (memcpy,
strlen, strcat, strchr, ...) but memchr was missing.
On x86_64 Linux hosts the omission has no visible effect because
host glibc dispatches memchr through an IFUNC resolver
(__memchr_ifunc) that the static libc.a path does not eagerly pull
in for typical sim links. On HOST_ARM64 (Ubuntu 20.04 aarch64,
glibc 2.31 .. 2.41), however, the final cc/ld invocation in the
sim Makefile drags libc.a(memchr.o) into the link, which then
collides with nuttx libc's lib_memchr.o that has already been
folded into nuttx.rel:
/usr/bin/ld: /usr/lib/gcc/aarch64-linux-gnu/9/../../../aarch64-linux-gnu/libc.a(memchr.o):
in function `__memchr_ifunc':
(.text+0x0): multiple definition of `memchr';
nuttx.rel:libs/libc/string/lib_memchr.c:55: first defined here
Add memchr to the rename list (placed in alphabetical position
between malloc_usable_size and memcpy). After this fix sim:nsh
builds cleanly on aarch64 Linux hosts (verified on NVIDIA Jetson
Orin L4T Ubuntu 20.04 + Raspberry Pi 4B Debian 13 trixie). The
behaviour on x86_64 / macOS / Cygwin hosts is unchanged because
those targets either never hit the collision or use the
underscore-prefixed variant gated by NXSYMBOLS macro definition
in the same file (lines 26-31).
Signed-off-by: Jinji Cui <113000688+cjj66619@users.noreply.github.com>
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| .github | ||
| arch | ||
| audio | ||
| binfmt | ||
| boards | ||
| cmake | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| dummy | ||
| fs | ||
| graphics | ||
| include | ||
| libs | ||
| mm | ||
| net | ||
| openamp | ||
| pass1 | ||
| sched | ||
| syscall | ||
| tools | ||
| video | ||
| wireless | ||
| .asf.yaml | ||
| .codespell-ignore-lines | ||
| .codespellrc | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmessage | ||
| .pre-commit-config.yaml | ||
| .yamllint | ||
| AUTHORS | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
| Makefile | ||
| NOTICE | ||
| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.