IAR Embedded Workbench for Arm 9.70.xIAR C/C++ DevelopmentCompiler optionsDescriptions of compiler options‑‑thumb‑‑thumbIn this section: Syntax‑‑thumbDescriptionUse this option to set default function mode to Thumb (T32 or T in 32-bit mode).NoteThis option has the same effect as the ‑‑cpu_mode=thumb option.CautionProject>Options>C/C++ Compiler>Code>Processor mode>Thumb