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--gcc-global-registers
(grades: ‘reg’, ‘asm_fast’)--no-gcc-global-registers
(grades: ‘none’)Specify whether to use GNU C’s global register variables extension. This option is used only when targeting C with ‘--no-high-level-code’.
--gcc-non-local-gotos
(grades: ‘asm_fast’)--no-gcc-non-local-gotos
(grades: ‘none’, ‘reg’)Specify whether to use GNU C’s “labels as values” extension. This option is used only when targeting C with ‘--no-high-level-code’.
--asm-labels
(grades: ‘asm_fast’)--no-asm-labels
(grades: ‘none’, ‘reg’)Specify whether GNU C’s asm extensions for inline assembler labels. This option is used only when targeting C with ‘--no-high-level-code’.