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During the Toybox port to NuttX, Claude noticed that changes in the menuconfig weren't taking affect. This issue exists for a long time on NuttX, in fact BayLibre's presentation from 2017 make jokes about our building system not been reliable: https://www.youtube.com/watch?v=XUJK2htXxKw&t=320s Stale archive members from $(AR)'s additive-only behavior can linger after Kconfig toggles change which files provide a symbol, causing dead weight or "multiple definition" link errors on incremental builds. Fixed by splitting ARCHIVE into two macros: ARCHIVE keeps the original additive behavior for apps/libapps.a, which many independent subdirectories contribute to across a build, while the new ARCHIVE_REBUILD deletes then archives for the far more common case of a single Makefile building its own self-contained $(OBJS) - all 39 such call sites now use it. Assisted-By: Claude Sonnet 5 Signed-off-by: Alan C. Assis <acassis@gmail.com> |
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README ====== This directory provides support for the two-pass build. Its primary purpose is to incorporate source logic generated by applications into the kernel phase of the build. In the two pass build, the application logic is built during the first phase, pass 1. In that phase, the application may generate and install source files into the pass1/ directory. The operating system is built during phase 2 of the build. At that time, those source files in the pass1/ directory will be built and incorporated into the kernel address space. The primary purpose of the pass1/ directory is to such application- generated kernel symbol tables. For an example of the use of this feature, look at apps/examples/module/drivers/Makefile. Kernel symbol tables are needed to support kernel modules. Of course, addition board-specific logic in, say, at boards/<arch>/<chip>/<board>/src would have to be included to make use of the application-installed symbol tables.