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In GNU ld and ld.lld, -d is used with -r to allocate space to COMMON symbols. This behavior is presumably to work around legacy projects which inspect relocatable output by themselves and do not handle COMMON symbols. The GRUB does not do this. See https://github.com/llvm/llvm-project/issues/53660 -d is quite useless and ld.lld 15.0.0 will make -d no-op. COMMON symbols have special symbol resolution semantics which can cause surprise (see https://maskray.me/blog/2022-02-06-all-about-common-symbols). GCC<10 and Clang<11 defaulted to -fcommon. Just use -fno-common to avoid COMMON symbols. Signed-off-by: Fangrui Song <maskray@google.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'