https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118642
Bug ID: 118642
Summary: -specs=sync-none.specs doesn't work with LTO.
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rearnsha at gcc dot gnu.org
Target Milestone: ---
Target: arm-none-eabi
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. (gcc invokes LD during LTO and uses -nostdlib).
.../ld-new:--defsym:1: undefined symbol `__sync_synchronize_none' referenced in
expression
