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Compiler Reference Guide
Conventions and Feedback
Introduction
Compiler Command-line Options
-Aopt
--allow_fpreg_for_nonfpdata, --no_allow_fpreg_for_
--allow_null_this, --no_allow_null_this
--alternative_tokens, --no_alternative_tokens
--anachronisms, --no_anachronisms
--apcs=qualifer...qualifier
--arm
--arm_only
--asm
--asm_dir=directory_name
--autoinline, --no_autoinline
--bigend
--bitband
--brief_diagnostics, --no_brief_diagnostics
--bss_threshold=num
-c
-C
--c90
--c99
--code_gen, --no_code_gen
--compatible=name
--compile_all_input, --no_compile_all_input
--conditionalize, --no_conditionalize
--cpp
--cpu=list
--cpu=name
--create_pch=filename
-Dname[(parm-list)][=def]
--data_reorder, --no_data_reorder
--debug, --no_debug
--debug_macros, --no_debug_macros
--default_extension=ext
--dep_name, --no_dep_name
--depend=filename
--depend_dir=directory_name
--depend_format=string
--depend_single_line, --no_depend_single_line
--depend_system_headers, --no_depend_system_header
--depend_target=target
--diag_error=tag[,tag,...]
--diag_remark=tag[,tag,...]
--diag_style={arm|ide}
--diag_suppress=tag[,tag,...]
--diag_suppress=optimizations
--diag_warning=tag[,tag,...]
--diag_warning=optimizations
--dollar, --no_dollar
--dwarf2
--dwarf3
-E
--echo
--emit_frame_directives, --no_emit_frame_directive
--enum_is_int
--errors=filename
--exceptions, --no_exceptions
--exceptions_unwind, --no_exceptions_unwind
--extended_initializers, --no_extended_initializer
--feedback=filename
--force_new_nothrow, --no_force_new_nothrow
--forceinline
--fp16_format=format
--fpmode=model
--fpu=list
--fpu=name
--friend_injection, --no_friend_injection
-g
--global_reg=reg_name[,reg_name,...]
--guiding_decls, --no_guiding_decls
--help
-Idir[,dir,...]
--ignore_missing_headers
--implicit_include, --no_implicit_include
--implicit_include_searches, --no_implicit_include
--implicit_key_function, --no_implicit_key_functio
--implicit_typename, --no_implicit_typename
--info=totals
--inline, --no_inline
--interface_enums_are_32_bit
--interleave
-Jdir[,dir,...]
--kandr_include
-Lopt
--library_interface=lib
--library_type=lib
--licretry
--link_all_input, --no_link_all_input
--list
--list_dir=directory_name
--list_macros
--littleend
--locale=lang_country
--long_long
--loose_implicit_cast
--lower_ropi, --no_lower_ropi
--lower_rwpi, --no_lower_rwpi
--ltcg
-M
--md
--message_locale=lang_country[.codepage]
--min_array_alignment=opt
--mm
--multibyte_chars, --no_multibyte_chars
--multifile, --no_multifile
--multiply_latency=cycles
--nonstd_qualifier_deduction, --no_nonstd_qualifie
-o filename
-Onum
--old_specializations, --no_old_specializations
--old_style_preprocessing
--omf_browse
-Ospace
-Otime
--output_dir=directory_name
-P
--parse_templates, --no_parse_templates
--pch
--pch_dir=dir
--pch_messages, --no_pch_messages
--pch_verbose, --no_pch_verbose
--pending_instantiations=n
--phony_targets
--pointer_alignment=num
--preinclude=filename
--preprocess_assembly
--preprocessed
--protect_stack, --no_protect_stack
--reassociate_saturation, --no_reassociate_saturat
--reduce_paths, --no_reduce_paths
--remarks
--remove_unneeded_entities, --no_remove_unneeded_e
--restrict, --no_restrict
--retain=option
--rtti, --no_rtti
--rtti_data, --no_rtti_data
-S
--show_cmdline
--signed_bitfields, --unsigned_bitfields
--signed_chars, --unsigned_chars
--split_ldm
--split_sections
--strict, --no_strict
--strict_warnings
--sys_include
--thumb
--trigraphs, --no_trigraphs
--type_traits_helpers, --no_type_traits_helpers
-Uname
--unaligned_access, --no_unaligned_access
--use_frame_pointer
--use_pch=filename
--using_std, --no_using_std
--version_number
--vfe, --no_vfe
--via=filename
--vla, --no_vla
--vsn
-W
--wchar, --no_wchar
--wchar16
--wchar32
--whole_program
--wrap_diagnostics, --no_wrap_diagnostics
Language Extensions
Compiler-specific Features
C and C++ Implementation Details
Semihosting
ARMv6 SIMD Instruction Intrinsics
Via File Syntax
Standard C Implementation Definition
Standard C++ Implementation Definition
C and C++ Compiler Implementation Limits
Compiler Reference Guide
--feedback=filename
| |||
| Home > Compiler Command-line Options > --feedback=filename | |||
This option enables the efficient elimination of unused functions, and on the ARMv4T architecture, enables reduction of compilation required for interworking.
Syntax
--feedback=filename
where:
filenameis the feedback file created by a previous execution of the ARM linker.
You can perform multiple compilations using the same feedback file. The compiler places each unused function identified in the feedback file into its own ELF section in the corresponding object file.
The feedback file contains information about a previous build. Because of this:
The feedback file might be out of date. That is, a function previously identified as being unused might be used in the current source code. The linker removes the code for an unused function only if it is not used in the current source code.
Note
For this reason, eliminating unused functions using linker feedback is a safe optimization, but there might be a small impact on code size.
The usage requirements for reducing compilation required for interworking are more strict than for eliminating unused functions. If you are reducing interworking compilation, it is critical that you keep your feedback file up to date with the source code that it was generated from.
You have to do a full compile and link at least twice to get the maximum benefit from linker feedback. However, a single compile and link using feedback from a previous build is usually sufficient.
--feedback=filename in the Linker Reference
Linker feedback during compilation in Using the Compiler.
| Copyright © 2007-2008, 2011-2012 ARM. All rights reserved. | ARM DUI 0376D |
| Non-Confidential | ID062912 |
 PDF version | |
| Home > Compiler Command-line Options > --feedback=filename |
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