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What's New In This Release

Major Changes to Core OS

New Features

Bug Fixes

New Features

Major Changes to the Build System

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Security Issues Fixed In This Release

Compatibility Concerns

Changes to Build System

If you have are building NuttX for a custom board, you may need to make some of the following changes in build-related files for your board:

Rename EXTRADEFINES to EXTRAFLAGS

In your custom board's scripts/Make.defs file, rename EXTRADEFINES to EXTRAFLAGS.

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To see why, tools/Config.mk assigns a value to KDEFINE such that the preprocessor symbol __KERNEL__ will be defined when certain source files are compiled. KDEFINE is passed to nested invocations of 'make' as EXTRAFLAGS. If your board's scripts/Make.defs still attempts to use EXTRADEFINES, the preprocessor symbol __KERNEL__ will not be defined in some of the places that it should be. Suppose you're building a FLAT build. In this case, include/nuttx/mm/mm.h will not define MM_KERNEL_USRHEAP_INIT like it should, which will cause nx_start.c not to call up_allocate_heap() at startup. Therefore, any attempt to allocate memory on the heap will fail.

Rename src/Makefile to src/Make.defs and Modify

This item pertains only to custom boards that are developed in-tree, meaning under the NuttX boards/ subdirectory. Out-of-tree boards are not affected.

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If you forget to do this, 'make' will report an error, "no rule to make libboard.a," and the build will fail.

Rename WINTOOL to CONFIG_CYGWIN_WINTOOL

In your custom board's scripts/Make.defs file, rename any instances of WINTOOL to CONFIG_CYGWIN_WINTOOL.

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See git commit # bd656888f26c92e8832f0e76b395a5ece7704530 in the main NuttX repository.

Remove INCDIROPT

In your custom board's src/Make.defs file, remove INCDIROPT from CFLAGS.

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See git commit # 5eae32577e5d5226e5d3027c169eeb369f83f77d in the main NuttX repository.

Known Problems In This Release

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