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When Bash attempts to find the current working directory, it uses a C library call `getcwd` to resolve it. When cross-compiling, the configuration process cannot determine if the target system's C library can support an "unfixed" path length. Therefore, Bash will fallback to a size of `PATH_MAX` for determining the current working directory. When using OverlayFS (and possible other file systems), this becomes an issue since file paths can commonly exceed standard `PATH_MAX` length. This typically results in the following error appearing: error retrieving current directory: [...] Common C library `getcwd` calls can default to a higher limit (usually the system's page size). The current configurable C libraries (as of at least 2015.08) support a zero (0) size buffer length. Most use the system's page size; musl, being an exception, which defaults to `PATH_MAX` (as Bash was doing). Since these C libraries support allocating buffer space with a zero (0) provided size, the following configuration change allows Bash to support getting a larger-length'ed working directory on target's that support it. Signed-off-by: James Knight <james.knight@rockwellcollins.com> Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC.