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squid can use the __sync built-ins when available, but uses an AC_TRY_RUN autoconf tests to check their availability, which isn't compatible with cross-compilation. Due to this, squid.mk is already hinting the configure script about this by passing squid_cv_gnu_atomics=yes/no depending on the availability of atomic operations. So far, squid.mk was assuming that BR2_ARCH_HAS_ATOMICS && BR2_ARCH_IS_64 was needed, since 8 bytes __sync built-ins are used. However, this was a bit too restrictive, since certain 32 bits architectures (ARM, x86) do provide 8 bytes __sync built-ins. So, instead of using BR2_ARCH_HAS_ATOMICS, we now rely on BR2_TOOLCHAIN_HAS_SYNC_4 and BR2_TOOLCHAIN_HAS_SYNC_8, since both 4 bytes and 8 bytes __sync built-ins are tested by the autoconf test. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
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. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches