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Bruce Ashfield
29500c42b4
During the build for some architectures, perf generates a program which executes on the host to dump the syscall table. The generation of that program uses the cross compiler + sysroot to expand unistd.h. As such, we are getting the contents of that file from linux-libc-headers. The compilation of that generated program uses the host compiler and a restricted include path to the perf source code. In the perf source there is a captured unistd.h, as such it will be used when compiling the host executable. The perf source code is copied from the kernel version that is being built .. so we have a mismatch between the generation and the compilation of the host program. Normally this mismatch is fine, but if the libc-headers are newer than the kernel, we'll have syscalls (and their syscall numbers) that are not defined in the perf source code. This leads to a compiler error and a cascading failure of the perf build due to a missing generated file. To fix this, we can copy unistd.h from the recipe-sysroot into the perf source code and they will always be in sync. (From OE-Core rev: 3a23e094c4189af878e467f1636aea63955e250d) Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.