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Remove warning when building sync.c for Cortex-M0#36

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mossmann merged 1 commit intomossmann:masterfrom
martinling:sync
Feb 9, 2026
Merged

Remove warning when building sync.c for Cortex-M0#36
mossmann merged 1 commit intomossmann:masterfrom
martinling:sync

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This warning doesn't serve any useful purpose:

../../cm3/sync.c:30:2: warning: #warning "sync not supported on ARMv6-M arch" [-Wcpp]
   30 | #warning "sync not supported on ARMv6-M arch"
      |  ^~~~~~~

This change gets rid of that warning, which has been similarly removed in upstream libopencm3.

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