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About the linker

The linker, armlink, combines the contents of one or more object files with selected parts of one or more object libraries to produce:

  • an ARM ELF image

  • a partially linked ELF object that can be used as input in a subsequent link step

  • ELF files that can be demand-paged efficiently

  • a shared object, compatible with the Base Platform Application Binary Interface (BPABI) or System V release 4 (SysV) specification, or a BPABI or SysV executable file.

The linker can:

  • link ARM code and Thumb® code

  • generate interworking veneers to switch between ARM and Thumb states when required

  • generate inline veneers or long branch veneers, where required, to extend the range of branch instructions

  • automatically select the appropriate standard C or C++ library variants to link with, based on the build attributes of the objects it is linking

  • enable you to specify the locations of code and data within the system memory map, using either a command-line option or a scatter file

  • perform Read/Write data compression to minimize ROM size

  • perform unused section elimination to reduce the size of your output image

  • control the generation of debug information in the output file

  • generate a static callgraph and list the stack usage

  • control the contents of the symbol table in output images

  • show the sizes of code and data in the output

  • use linker feedback to remove individual unused functions

  • accept GNU ld scripts, with restrictions.

Note

A 64-bit version of armlink is provided that can utilize the greater amount of memory available to processes on 64-bit operating systems. It supports all the features that are supported by the 32-bit version of armlink in this release.

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