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* DWARF-5 is now used by default with gcc-11, causing 11.1.0/ld: internal error in format_file_lineno, at ../../gold/dwarf_reader.cc:2278 collect2: error: ld returned 1 exit status in various projects (runc-opencontainers, libhybris, collada-dom) * https://gcc.gnu.org/gcc-11/changes.html For targets that produce DWARF debugging information GCC now defaults to DWARF version 5 (with the exception of VxWorks and Darwin/Mac OS X which default to version 2 and AIX which defaults to version 4). This can produce up to 25% more compact debug information compared to earlier versions. To take full advantage of DWARF version 5 GCC needs to be build against binutils version 2.35.2 or higher. When GCC is build against earlier versions of binutils GCC will still emit DWARF version 5 for most debuginfo data, but will generate version 4 debug line tables (even when explicitly given -gdwarf-5). The following debug information consumers can process DWARF version 5: GDB 8.0, or higher valgrind 3.17.0 elfutils 0.172, or higher (for use with systemtap, dwarves/pahole, perf and libabigail) dwz 0.14 Programs embedding libbacktrace are urged to upgrade to the version shipping with GCC 11. To make GCC 11 generate an older DWARF version use -g together with -gdwarf-2, -gdwarf-3 or -gdwarf-4. (From OE-Core rev: d07d4d739ae17787017f771dd2068fda0e836722) Signed-off-by: Martin Jansa <Martin.Jansa@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.