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Linker User Guide

Preface Overview of the Linker Linking Models Supported by armlink Image Structure and Generation Linker Optimization Features Getting Image Details Accessing and Managing Symbols with armlink Scatter-loading Features Scatter File Syntax Linker Command-line Options --any_contingency --any_placement=algorithm --any_sort_order=order --api, --no_api --arm_only --autoat, --no_autoat --be8 --be32 --bestdebug, --no_bestdebug --blx_arm_thumb, --no_blx_arm_thumb --blx_thumb_arm, --no_blx_thumb_arm --branchnop, --no_branchnop --callgraph, --no_callgraph --callgraph_file=filename --callgraph_output=fmt --callgraph_subset=symbol[,symbol,...] --cgfile=type --cgsymbol=type --cgundefined=type --comment_section, --no_comment_section --compress_debug, --no_compress_debug --cpp_compat linker option --cppinit, --no_cppinit --cpu=list --cpu=name --crosser_veneershare, --no_crosser_veneershare --datacompressor=opt --debug, --no_debug --diag_error=tag[,tag,…] --diag_remark=tag[,tag,…] --diag_style=arm|ide|gnu --diag_suppress=tag[,tag,…] --diag_warning=tag[,tag,…] --eager_load_debug, --no_eager_load_debug --edit=file_list --emit_debug_overlay_relocs --emit_debug_overlay_section --emit_non_debug_relocs --emit_relocs --entry=location --errors=filename --exceptions, --no_exceptions --feedback=filename --feedback_image=option --feedback_type=type --filtercomment, --no_filtercomment --fini=symbol --first=section_id --force_explicit_attr --fpu=list --fpu=name --help --info=topic[,topic,…] --info_lib_prefix=opt --init=symbol --inline, --no_inline --inline_type=type --inlineveneer, --no_inlineveneer input-file-list --keep=section_id --largeregions, --no_largeregions --last=section_id --ldpartial --legacyalign, --no_legacyalign --libpath=pathlist --library_type=lib --liclinger=seconds --list=filename --list_mapping_symbols, --no_list_mapping_symbols --load_addr_map_info, --no_load_addr_map_info --locals, --no_locals --mangled, --unmangled --map, --no_map --match=crossmangled --max_er_extension=size --max_veneer_passes=value --max_visibility=type --merge, --no_merge --muldefweak, --no_muldefweak -o filename, --output=filename --output_float_abi=option --override_visibility --pad=num --paged --pagesize=pagesize --partial --piveneer, --no_piveneer --predefine="string" --reduce_paths, --no_reduce_paths --ref_cpp_init, --no_ref_cpp_init --reloc --remarks --remove, --no_remove --ro_base=address --ropi --rosplit --rw_base=address --rwpi --scanlib, --no_scanlib --scatter=filename --section_index_display=type --show_cmdline --show_full_path --show_parent_lib --show_sec_idx --sort=algorithm --split --startup=symbol, --no_startup --strict --strict_enum_size, --no_strict_enum_size --strict_flags, --no_strict_flags --strict_ph, --no_strict_ph --strict_relocations, --no_strict_relocations --strict_symbols, --no_strict_symbols --strict_visibility, --no_strict_visibility --strict_wchar_size, --no_strict_wchar_size --symbols, --no_symbols --symdefs=filename --tailreorder, --no_tailreorder --thumb2_library, --no_thumb2_library --tiebreaker=option --unaligned_access, --no_unaligned_access --undefined=symbol --undefined_and_export=symbol --unresolved=symbol --use_definition_visibility --userlibpath=pathlist --veneerinject, --no_veneerinject --veneer_inject_type=type --veneer_pool_size=size --veneershare, --no_veneershare --verbose --version_number --vfemode=mode --via=filename --vsn --xo_base=address --xref, --no_xref --xrefdbg, --no_xrefdbg --xref{from|to}=object(section) --zi_base=address Linker Steering File Command Reference Via File Syntax

--merge, --no_merge

9.78 --merge, --no_merge

Enables or disables the merging of const strings that are placed in shareable sections by the compiler.

Usage

Using --merge can reduce the size of the image if there are similarities between const strings.
Use --info=merge to see a listing of the merged const strings.
By default, merging happens between different load and execution regions. Therefore, code from one execution or load region might use a string stored in different region. If you do not want this behavior, then do one of the following:
  • Use the PROTECTED load region attribute if you are using scatter-loading.
  • Globally disable merging with --no_merge.

Default

The default is --merge.
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