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gcc-12 is starting to trickle down to some distros, like Archlinux. gcc-12 has new warnings, and detects more cases of issues, like new UAF cases, which is causing build issues in code that was previously building fine, as reported in #14826: In file included from sigchain.c:3: In function 'xrealloc', inlined from 'sigchain_push.isra' at sigchain.c:26:2: subcmd-util.h:56:23: error: pointer may be used after 'realloc' [-Werror=use-after-free] 56 | ret = realloc(ptr, size); | ^~~~~~~~~~~~~~~~~~ subcmd-util.h:52:21: note: call to 'realloc' here 52 | void *ret = realloc(ptr, size); | ^~~~~~~~~~~~~~~~~~ subcmd-util.h:58:31: error: pointer may be used after 'realloc' [-Werror=use-after-free] 58 | ret = realloc(ptr, 1); | ^~~~~~~~~~~~~~~ subcmd-util.h:52:21: note: call to 'realloc' here 52 | void *ret = realloc(ptr, size); | ^~~~~~~~~~~~~~~~~~ In that case, the kernel has already fixed their code, which is part of 5.17: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=52a9dab6d892763b2a8334a568bd4e2c1a6fde66 However, we can't easily carry that patch, because we don't know whether the kernel the user uses already has the fix or not. Instead, we can just tell the kernel to disable use of -Werror when building host tools. As a consequence, we can drop it from the perf-specific setting. Fixes: #14826 Reported-by: Anders Pitman <buildroot@apitman.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
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 OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches