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The three patches allow to compile applications using TLS emulation from libgcc or C++ applications. The patches 892-libgcc-mkmap-symver-support-skip_underscore.patch and 893-libgcc-config-bfin-use-the-generic-linker-version-in.patch fixes how libgcc is generated, by making the necessary libgcc symbols declared "GLOBAL", and therefore visible outside of libgcc. This fixes a large number of undefined reference issues (for either C++ applications or applications using TLS emulation). This was reported as gcc PR74748. The patch 894-libgcc-fix-DWARF-compilation-with-FDPIC-targets.patch allows to build DWARF in FDPIC mode. This patch replaces the older 892-disable-dwarf-bfin.patch, as instead of disabling DWARF support, it fixes it. This was reported as gcc PR68468. In order to get C++ working without unresolved symbols, we also need to disable symbol versioning (--disable-symvers). This is a remaining issue in gcc which will be investigated at a later point. Since this commit fixes C++ support in Blackfin, it re-enables the selection of C++ support for this architecture. Fixes: (alsa-lib emutls) http://autobuild.buildroot.net/results/8544ce58d75820666579db93a25ca5656a8efa8e/ (cairo emutls) http://autobuild.buildroot.net/results/88b02a5dd5408318941ccbfcea0a9cbaa331500a/ (audiofile c++) http://autobuild.buildroot.net/results/394e530c5dcd9ccb590eb151aeaadb37d11e0e39/ (assimp c++) http://autobuild.buildroot.net/results/01f4be126c2d786a5ad7f220c2cf60539888a480/ (bellagio c++) http://autobuild.buildroot.net/results/ada/ada44228bf13ec05382275bd6571396f5ba2b1f7/ Signed-off-by: Waldemar Brodkorb <wbx@openadk.org> Tested-by: Waldemar Brodkorb <wbx@openadk.org> 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