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libunwind configure script explicitly links libunwind against libgcc_s. libgcc_s is only guaranteed to be available for toolchains that supports dynamic linking: pure static linking toolchains only have libgcc.a, not libgcc_s.so. Therefore, let's make libunwind unavailable on toolchains that lack dynamic linking support. We could potentially support linking with libgcc, but switching to libgcc_s was done upstream because libgcc was lacking some symbols on ARM (https://lists.nongnu.org/archive/html/libunwind-devel/2014-06/msg00024.html). Even though recent gcc versions seem to provide such symbols in libgcc.a, having libunwind available on static linking configurations is not a useful enough use-case to do the necessary research to find when this issue was fixed in gcc. Since libunwind is not used as a mandatory dependency in any package, adding this !BR2_STATIC_LIBS dependency is trivial and nicely avoids the problematic situation. This fixes two different autobuilder failures: - Gstreamer 1.x programs failing to link, because libunwind links against libgcc_s that isn't available (static linking configuration): http://autobuild.buildroot.net/results/9d4fbf7167e9afce0eef5c9e0cfd42c966ecba36/ - Gmrender-resurrect, which fails to link, because GStreamer 1.x uses some libunwind functionality, but does not take into account the libunwind dependency in its .pc files (static linking configuration): http://autobuild.buildroot.net/results/0a3a2485c187a000482c178f1e9c64dd716a858f/ Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.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. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches