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GCC uses thunk functions to adjust the 'this' pointer when calling C++ member functions in classes derived with multiple inheritance. Generation of thunk functions requires support from the compiler back end. In the absence of that support target-independent code in the C++ front end is used to generate thunk functions, but it does not support vararg functions. Support for this feature is currently missing in or1k and xtensa toolchains. Add hidden option BR2_TOOLCHAIN_SUPPORTS_VARIADIC_MI_THUNK that indicates presence of this feature in the toolchain. Add dependency to packages that require this feature to be built. Fixes: http://autobuild.buildroot.net/results/c9e660c764edbd7cf0ae54ab0f0f412464721446/ http://autobuild.buildroot.net/results/9a3bf4b411c418ea78d59e35d23ba865dd453890/ Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.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