https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118642
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Earnshaw <rearn...@gcc.gnu.org>: https://gcc.gnu.org/g:0204dcf930b5093d0811a007b7f47aa42e55e787 commit r15-7258-g0204dcf930b5093d0811a007b7f47aa42e55e787 Author: Richard Earnshaw <rearn...@arm.com> Date: Tue Jan 28 16:14:35 2025 +0000 arm: libgcc: make -spec=sync-*.specs compatible with LTO [PR118642] The arm-none-eabi port provides some alternative implementations of __sync_synchronize for different implementations of the architecture. These can be selected using one of -specs=sync-{none,dmb,cp15dmb}.specs. These specs fragments fail, however, when LTO is used because they unconditionally add a --defsym=__sync_synchronize=<implementation> to the linker arguments and that fails if libgcc is not added to the list of libraries. Fix this by only adding the defsym if libgcc will be passed to the linker. libgcc/ PR target/118642 * config/arm/sync-none.specs (link): Only add the defsym if libgcc will be used. * config/arm/sync-dmb.specs: Likewise. * config/arm/sync-cp15dmb.specs: Likewise.
