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Preface armclang Command-line Options Support level definitions Summary of armclang command-line options -C -c -D -E -e -fbare-metal-pie -fbracket-depth=N -fcommon, -fno-common -fdata-sections, -fno-data-sections -ffast-math, -fno-fast-math -ffixed-rN -ffp-mode -ffunction-sections, -fno-function-sections -fident, -fno-ident @file -fldm-stm, -fno-ldm-stm -fno-builtin -fno-inline-functions -flto, -fno-lto -fexceptions, -fno-exceptions -fomit-frame-pointer, -fno-omit-frame-pointer -fropi, -fno-ropi -fropi-lowering, -fno-ropi-lowering -frwpi, -fno-rwpi -frwpi-lowering, -fno-rwpi-lowering -fshort-enums, -fno-short-enums -fshort-wchar, -fno-short-wchar -fstack-protector, -fstack-protector-all, -fstack- -fstrict-aliasing, -fno-strict-aliasing -ftrapv -fvectorize, -fno-vectorize -fvisibility -fwrapv -g, -gdwarf-2, -gdwarf-3, -gdwarf-4 -I -include -L -l -M, -MM -MD, -MMD -MF -MG -MP -MT -march -marm -masm -mbig-endian -mbranch-protection -mcmse -mcpu -mexecute-only -mfloat-abi -mfpu -mimplicit-it -mlittle-endian -mmemtag-stack, -mno-memtag-stack -mno-neg-immediates -moutline, -mno-outline -mpixolib -munaligned-access, -mno-unaligned-access -mthumb -nostdlib -nostdlibinc -o -O -pedantic -pedantic-errors -Rpass -S -save-temps -std --target -U -u -v --version --version_number --vsn -W -Wl -Xlinker -x -### Compiler-specific Keywords and Operators Compiler-specific Function, Variable, and Type Att Compiler-specific Intrinsics Compiler-specific Pragmas Other Compiler-specific Features Standard C Implementation Definition Standard C++ Implementation Definition armclang Integrated Assembler armclang Inline Assembler

-mexecute-only

1.54 -mexecute-only

Generates execute-only code, and prevents the compiler from generating any data accesses to code sections.

To keep code and data in separate sections, the compiler disables literal pools and branch tables when using the -mexecute-only option.

Restrictions

Execute-only code must be T32 code.

Execute-only code is only supported for:

  • Processors that support the Armv8‑M architecture, with or without the Main Extension.
  • Processors that support the Armv7‑M architecture, such as the Cortex®-M3.

If your application calls library functions, the library objects included in the image are not execute-only compliant. You must ensure these objects are not assigned to an execute-only memory region.

Note:

Arm does not provide libraries that are built without literal pools. The libraries still use literal pools, even when you use the -mexecute-only option.

Note:

Link Time Optimization does not honor the armclang -mexecute-only option. If you use the armclang -flto or -Omax options, then the compiler cannot generate execute-only code and produces a warning.
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