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Chapter 1

armclang Command-line Options

This chapter summarizes the supported options used with armclang.

armclang provides many command-line options, including most Clang command-line options in addition

to a number of Arm-specific options. Additional information about community feature command-line

options is available in the Clang and LLVM documentation on the LLVM Compiler Infrastructure

Project web site, http://llvm.org.

Note

Be aware of the following:

• Generated code might be different between two Arm Compiler releases.

• For a feature release, there might be significant code generation differences.

It contains the following sections:

• 1.1 Support level definitions on page 1-19.

• 1.2 Summary of armclang command-line options on page 1-23.

• 1.3 -C on page 1-28.

• 1.4 -c on page 1-30.

• 1.5 -D on page 1-31.

• 1.6 -E on page 1-32.

• 1.7 -e on page 1-33.

• 1.8 -fbare-metal-pie on page 1-34.

• 1.9 -fbracket-depth=N on page 1-35.

• 1.10 -fcommon, -fno-common on page 1-36.

• 1.11 -fdata-sections, -fno-data-sections on page 1-37.

• 1.12 -ffast-math, -fno-fast-math on page 1-38.

• 1.13 -ffixed-rN on page 1-39.

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reserved.

1-16

Non-Confidential

• 1.14 -ffp-mode on page 1-41.

• 1.15 -ffunction-sections, -fno-function-sections on page 1-43.

• 1.16 -fident, -fno-ident on page 1-45.

• 1.17 @file on page 1-46.

• 1.18 -fldm-stm, -fno-ldm-stm on page 1-47.

• 1.19 -fno-builtin on page 1-48.

• 1.20 -fno-inline-functions on page 1-50.

• 1.21 -flto, -fno-lto on page 1-51.

• 1.22 -fexceptions, -fno-exceptions on page 1-52.

• 1.23 -fomit-frame-pointer, -fno-omit-frame-pointer on page 1-53.

• 1.24 -fropi, -fno-ropi on page 1-54.

• 1.25 -fropi-lowering, -fno-ropi-lowering on page 1-55.

• 1.26 -frwpi, -fno-rwpi on page 1-56.

• 1.27 -frwpi-lowering, -fno-rwpi-lowering on page 1-57.

• 1.28 -fshort-enums, -fno-short-enums on page 1-58.

• 1.29 -fshort-wchar, -fno-short-wchar on page 1-60.

• 1.30 -fstack-protector, -fstack-protector-all, -fstack-protector-strong, -fno-stack-protector

on page 1-61.

• 1.31 -fstrict-aliasing, -fno-strict-aliasing on page 1-63.

• 1.32 -ftrapv on page 1-64.

• 1.33 -fvectorize, -fno-vectorize on page 1-65.

• 1.34 -fvisibility on page 1-66.

• 1.35 -fwrapv on page 1-67.

• 1.36 -g, -gdwarf-2, -gdwarf-3, -gdwarf-4 on page 1-68.

• 1.37 -I on page 1-69.

• 1.38 -include on page 1-70.

• 1.39 -L on page 1-71.

• 1.40 -l on page 1-72.

• 1.41 -M, -MM on page 1-73.

• 1.42 -MD, -MMD on page 1-74.

• 1.43 -MF on page 1-75.

• 1.44 -MG on page 1-76.

• 1.45 -MP on page 1-77.

• 1.46 -MT on page 1-78.

• 1.47 -march on page 1-79.

• 1.48 -marm on page 1-83.

• 1.49 -masm on page 1-84.

• 1.50 -mbig-endian on page 1-86.

• 1.51 -mbranch-protection on page 1-87.

• 1.52 -mcmse on page 1-89.

• 1.53 -mcpu on page 1-91.

• 1.54 -mexecute-only on page 1-96.

• 1.55 -mfloat-abi on page 1-97.

• 1.56 -mfpu on page 1-98.

• 1.57 -mimplicit-it on page 1-100.

• 1.58 -mlittle-endian on page 1-101.

• 1.59 -mmemtag-stack, -mno-memtag-stack on page 1-102.

• 1.60 -mno-neg-immediates on page 1-105.

• 1.61 -moutline, -mno-outline on page 1-107.

• 1.62 -mpixolib on page 1-110.

• 1.63 -munaligned-access, -mno-unaligned-access on page 1-112.

• 1.64 -mthumb on page 1-113.

• 1.65 -nostdlib on page 1-114.

• 1.66 -nostdlibinc on page 1-115.

• 1.67 -o on page 1-116.

• 1.68 -O on page 1-117.

1 armclang Command-line Options

reserved.

1-17

Non-Confidential

1.1 Support level definitions

This describes the levels of support for various Arm Compiler 6 features.

Arm Compiler 6 is built on Clang and LLVM technology. Therefore, it has more functionality than the

set of product features described in the documentation. The following definitions clarify the levels of

support and guarantees on functionality that are expected from these features.

Arm welcomes feedback regarding the use of all Arm Compiler 6 features, and intends to support users

to a level that is appropriate for that feature. You can contact support at https://developer.arm.com/

support.

Identification in the documentation

All features that are documented in the Arm Compiler 6 documentation are product features, except

where explicitly stated. The limitations of non-product features are explicitly stated.

Product features

Product features are suitable for use in a production environment. The functionality is well-tested, and is

expected to be stable across feature and update releases.

• Arm intends to give advance notice of significant functionality changes to product features.

• If you have a support and maintenance contract, Arm provides full support for use of all product

features.

• Arm welcomes feedback on product features.

• Any issues with product features that Arm encounters or is made aware of are considered for fixing in

future versions of Arm Compiler.

In addition to fully supported product features, some product features are only alpha or beta quality.

Beta product features

Beta product features are implementation complete, but have not been sufficiently tested to be

regarded as suitable for use in production environments.

Beta product features are indicated with [BETA].

• Arm endeavors to document known limitations on beta product features.

• Beta product features are expected to eventually become product features in a future release

of Arm Compiler 6.

• Arm encourages the use of beta product features, and welcomes feedback on them.

• Any issues with beta product features that Arm encounters or is made aware of are

considered for fixing in future versions of Arm Compiler.

Alpha product features

Alpha product features are not implementation complete, and are subject to change in future

releases, therefore the stability level is lower than in beta product features.

Alpha product features are indicated with [ALPHA].

• Arm endeavors to document known limitations of alpha product features.

• Arm encourages the use of alpha product features, and welcomes feedback on them.

• Any issues with alpha product features that Arm encounters or is made aware of are

considered for fixing in future versions of Arm Compiler.

Community features

Arm Compiler 6 is built on LLVM technology and preserves the functionality of that technology where

possible. This means that there are additional features available in Arm Compiler that are not listed in the

documentation. These additional features are known as community features. For information on these

community features, see the documentation for the Clang/LLVM project.

1 armclang Command-line Options

1.1 Support level definitions

reserved.

1-19

Non-Confidential

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