 RealView Linker and Utilities Guide | |
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RealView Linker and Utilities Guide
Preface Introduction The Linker Command Syntax Using the Basic Linker Functionality Specifying the image structure
Building blocks for objects and images Load view and execution view of an image Specifying an image memory map Image entry points Section placement Ordering input sections by attribute Using FIRST and LAST to place sections Aligning sections Ordering execution regions containing Thumb code Optimizations and modifications Common debug section elimination Common group or section elimination Unused section elimination Unused function elimination Linker feedback RW data compression PI to absolute veneers Veneer generation Reuse of veneers with overlay execution regions Branch inlining Using command-line options to create simple images Type 1, one load region and contiguous execution r Type 2, one load region and non contiguous executi Type 3, two load regions and non contiguous execut Using command-line options to handle C++ exception Getting information about images Using image-related information Accessing Image Symbols Using Scatter-loading Description Files Using the ARM Librarian Using fromelfUnused section elimination
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| Home > Using the Basic Linker Functionality > Optimizations and modifications > Unused section elimination | |||
Unused section elimination removes code that is never executed, or data that is not referred to by the code, from the final image. This optimization can be controlled by the ‑‑remove, ‑‑no_remove, ‑‑first, ‑‑last, and ‑‑keep linker options. Use the ‑‑info unused linker option to instruct the linker to generate a list of the unused sections that have been eliminated.
Unused section elimination is suppressed in those cases that might result in the removal of all sections.
An input section is retained in the final image under the following conditions:
if it contains an entry point
if it is referred to, directly or indirectly, by a non weak reference from an input section containing an entry point
if it is specified as the first or last input section by the
‑‑firstor‑‑lastoption (or a scatter-loading equivalent)if it is marked as unremovable by the
‑‑keepoption.
Note
Unused section elimination is a property of all groups, not just common groups.
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0377A |
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