Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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Karel Kočí 9f4b4faf47 libs/libc: add limits checks
NuttX defines constants for the sizes of types just as constants
directly in the code. The real values depend on compiler and target
platform. It is possible that value declared by NuttX header is wrong
compared to the compiler configuration. This is more likely in case of
floating points.

Not all compilers supported by NuttX provide required info through
defines and thus it is more generic to specify limits as constants, but
in case compiler provides them then it is a good idea to compare. This
commit adds such set of comparisons for limits.h and float.h constants.

The comparisons were tested with GCC and Clang. They will be ignored in
case compiler doesn't provide them.

Signed-off-by: Karel Kočí <kkoci@elektroline.cz>
2026-07-02 09:02:21 -03:00
.github build(deps): bump actions/cache from 5 to 6 2026-06-29 12:59:18 +02:00
arch drivers: Fix comment typos — 'Pubic' → 'Public' across drivers and headers. 2026-07-02 13:29:48 +08:00
audio include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
binfmt fs/binfmt: Enforce POSIX execute permissions prior to binary load 2026-06-13 21:07:01 +08:00
boards stm32f746g-disco: Add support for Winbond W25Q128JVEQ flash chip 2026-07-02 09:36:23 +02:00
cmake build/fix: remove nonexistent target in cmake 2026-06-08 16:03:21 +08:00
crypto !nuttx: drop redundant casts on tv_sec/tv_nsec and fix printf formats 2026-05-19 16:21:28 +08:00
Documentation boards/esp32s3: add support to M5Stack Cardputer board 2026-07-02 13:27:20 +08:00
drivers drivers/contactless/mfrc522: Contactless Driver Is Not Robust 2026-07-02 09:38:49 +02:00
dummy
fs !include/fcntl.h: align open flags with Linux values 2026-06-30 13:43:44 +08:00
graphics !include/fcntl.h: align open flags with Linux values 2026-06-30 13:43:44 +08:00
include float.h: improve long double related definitions 2026-07-02 09:02:21 -03:00
libs libs/libc: add limits checks 2026-07-02 09:02:21 -03:00
mm mm/gran: reject pools with too many granules 2026-06-24 08:41:28 -03:00
net !include/fcntl.h: align open flags with Linux values 2026-06-30 13:43:44 +08:00
openamp openamp: fix CMake dcache option 2026-05-10 15:03:24 +02:00
pass1 Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
sched !include/fcntl.h: align open flags with Linux values 2026-06-30 13:43:44 +08:00
syscall syscall: fcntl param3 type to uintptr_t 2026-04-27 12:01:55 -03:00
tools arch/arm: add Realtek RTL8721Dx and RTL8720F (Ameba WHC) support 2026-07-01 09:18:06 -03:00
video video: ensure video library is non-empty 2026-05-08 19:51:39 +08:00
wireless include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
.asf.yaml github: master branch protection tune. 2025-05-07 18:37:13 -05:00
.codespell-ignore-lines !boards: Remove NSH_ARCHINIT and board_app_initialize 2026-05-02 18:36:46 +08:00
.codespellrc arch/sim: replace macOS C++ constructor runtime hack with post-link patch 2026-05-19 07:08:55 -03:00
.editorconfig .editorconfig: fix character encoding property specification 2025-11-28 19:12:13 +08:00
.gitignore git: Specify multiple build directories in .gitignore. 2026-05-20 03:06:58 +08:00
.gitmessage docs/contributing: Add a commit message template 2025-06-03 17:33:24 +08:00
.pre-commit-config.yaml pre-commit: enable codespell checks 2025-05-05 12:34:39 +08:00
.yamllint
AUTHORS AUTHORS: add Eren Terzioglu 2026-05-20 15:17:00 +08:00
CMakeLists.txt cmake/nuttx_toolchain.cmake: track preprocessed include deps 2026-06-04 17:22:43 +08:00
CONTRIBUTING.md docs: Fix typos, formatting, and numbering in README.md and CONTRIBUTING.md. 2026-03-23 12:05:24 +01:00
INVIOLABLES.md
Kconfig sched/misc/assert: Add CONFIG_SCHED_DUMP_TASKS and CONFIG_SCHED_DUMP_STACK 2026-06-09 08:04:54 -04:00
LICENSE !arch/stm32: move stm32l1 and finalize the directory split 2026-06-24 14:54:44 -03:00
Makefile tools: migrate to SPDX identifier 2024-09-10 23:11:11 +08:00
NOTICE
README.md ci/testing: Add MemBrowse Integration 2026-06-18 12:07:41 -03:00
ReleaseNotes Documentation: move ReleaseNotes 2023-09-26 20:41:00 +08:00

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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.