SPRU514Z July   2001  – October 2023 SM320F28335-EP

 

  1.   1
  2.   Read This First
    1.     About This Manual
    2.     Notational Conventions
    3.     Related Documentation
    4.     Related Documentation From Texas Instruments
    5.     Trademarks
  3. 1 Introduction to the Software Development Tools
    1. 1.1 Software Development Tools Overview
    2. 1.2 Compiler Interface
    3. 1.3 ANSI/ISO Standard
    4. 1.4 Output Files
    5. 1.5 Utilities
  4. 2 Using the C/C++ Compiler
    1. 2.1  About the Compiler
    2. 2.2  Invoking the C/C++ Compiler
    3. 2.3  Changing the Compiler's Behavior with Options
      1. 2.3.1  Linker Options
      2. 2.3.2  Frequently Used Options
      3. 2.3.3  Miscellaneous Useful Options
      4. 2.3.4  Run-Time Model Options
      5. 2.3.5  Symbolic Debugging and Profiling Options
      6. 2.3.6  Specifying Filenames
      7. 2.3.7  Changing How the Compiler Interprets Filenames
      8. 2.3.8  Changing How the Compiler Processes C Files
      9. 2.3.9  Changing How the Compiler Interprets and Names Extensions
      10. 2.3.10 Specifying Directories
      11. 2.3.11 Assembler Options
      12. 2.3.12 Deprecated Options
    4. 2.4  Controlling the Compiler Through Environment Variables
      1. 2.4.1 Setting Default Compiler Options (C2000_C_OPTION)
      2. 2.4.2 Naming One or More Alternate Directories (C2000_C_DIR)
    5. 2.5  Controlling the Preprocessor
      1. 2.5.1  Predefined Macro Names
      2. 2.5.2  The Search Path for #include Files
        1. 2.5.2.1 Adding a Directory to the #include File Search Path (--include_path Option)
      3. 2.5.3  Support for the #warning and #warn Directives
      4. 2.5.4  Generating a Preprocessed Listing File (--preproc_only Option)
      5. 2.5.5  Continuing Compilation After Preprocessing (--preproc_with_compile Option)
      6. 2.5.6  Generating a Preprocessed Listing File with Comments (--preproc_with_comment Option)
      7. 2.5.7  Generating Preprocessed Listing with Line-Control Details (--preproc_with_line Option)
      8. 2.5.8  Generating Preprocessed Output for a Make Utility (--preproc_dependency Option)
      9. 2.5.9  Generating a List of Files Included with #include (--preproc_includes Option)
      10. 2.5.10 Generating a List of Macros in a File (--preproc_macros Option)
    6. 2.6  Passing Arguments to main()
    7. 2.7  Understanding Diagnostic Messages
      1. 2.7.1 Controlling Diagnostic Messages
      2. 2.7.2 How You Can Use Diagnostic Suppression Options
    8. 2.8  Other Messages
    9. 2.9  Generating Cross-Reference Listing Information (--gen_cross_reference_listing Option)
    10. 2.10 Generating a Raw Listing File (--gen_preprocessor_listing Option)
    11. 2.11 Using Inline Function Expansion
      1. 2.11.1 Inlining Intrinsic Operators
      2. 2.11.2 Inlining Restrictions
      3. 2.11.3 Unguarded Definition-Controlled Inlining
        1. 2.11.3.1 Using the Inline Keyword
      4. 2.11.4 Guarded Inlining and the _INLINE Preprocessor Symbol
        1. 2.11.4.1 Header File string.h
        2. 2.11.4.2 Library Definition File
    12. 2.12 Using Interlist
    13. 2.13 About the Application Binary Interface
    14. 2.14 Enabling Entry Hook and Exit Hook Functions
    15. 2.15 Live Firmware Update (LFU)
  5. 3 Optimizing Your Code
    1. 3.1  Invoking Optimization
    2. 3.2  Controlling Code Size Versus Speed
    3. 3.3  Performing File-Level Optimization (--opt_level=3 option)
      1. 3.3.1 Creating an Optimization Information File (--gen_opt_info Option)
    4. 3.4  Program-Level Optimization (--program_level_compile and --opt_level=3 options)
      1. 3.4.1 Controlling Program-Level Optimization (--call_assumptions Option)
      2. 3.4.2 Optimization Considerations When Mixing C/C++ and Assembly
    5. 3.5  Automatic Inline Expansion (--auto_inline Option)
    6. 3.6  Link-Time Optimization (--opt_level=4 Option)
      1. 3.6.1 Option Handling
      2. 3.6.2 Incompatible Types
    7. 3.7  Using Feedback Directed Optimization
      1. 3.7.1 Feedback Directed Optimization
        1. 3.7.1.1 Phase 1 -- Collect Program Profile Information
        2. 3.7.1.2 Phase 2 -- Use Application Profile Information for Optimization
        3. 3.7.1.3 Generating and Using Profile Information
        4. 3.7.1.4 Example Use of Feedback Directed Optimization
        5. 3.7.1.5 The .ppdata Section
        6. 3.7.1.6 Feedback Directed Optimization and Code Size Tune
        7. 3.7.1.7 Instrumented Program Execution Overhead
        8. 3.7.1.8 Invalid Profile Data
      2. 3.7.2 Profile Data Decoder
      3. 3.7.3 Feedback Directed Optimization API
      4. 3.7.4 Feedback Directed Optimization Summary
    8. 3.8  Using Profile Information to Analyze Code Coverage
      1. 3.8.1 Code Coverage
        1. 3.8.1.1 Phase1 -- Collect Program Profile Information
        2. 3.8.1.2 Phase 2 -- Generate Code Coverage Reports
      2. 3.8.2 Related Features and Capabilities
        1. 3.8.2.1 Path Profiler
        2. 3.8.2.2 Analysis Options
        3. 3.8.2.3 Environment Variables
    9. 3.9  Special Considerations When Using Optimization
      1. 3.9.1 Use Caution With asm Statements in Optimized Code
      2. 3.9.2 Use the Volatile Keyword for Necessary Memory Accesses
        1. 3.9.2.1 Use Caution When Accessing Aliased Variables
        2. 3.9.2.2 Use the --aliased_variables Option to Indicate That the Following Technique Is Used
        3. 3.9.2.3 On FPU Targets Only: Use restrict Keyword to Indicate That Pointers Are Not Aliased
          1. 3.9.2.3.1 Use of the restrict Type Qualifier With Pointers
          2. 3.9.2.3.2 Use of the restrict Type Qualifier With Pointers
    10. 3.10 Using the Interlist Feature With Optimization
    11. 3.11 Data Page (DP) Pointer Load Optimization
    12. 3.12 Debugging and Profiling Optimized Code
      1. 3.12.1 Profiling Optimized Code
    13. 3.13 Increasing Code-Size Optimizations (--opt_for_space Option)
    14. 3.14 Compiler Support for Re-Entrant VCU Code
    15. 3.15 Compiler Support for Generating DMAC Instructions
      1. 3.15.1 Automatic Generation of DMAC Instructions
      2. 3.15.2 Assertions to Specify Data Address Alignment
      3. 3.15.3 __dmac Intrinsic
    16. 3.16 What Kind of Optimization Is Being Performed?
      1. 3.16.1  Cost-Based Register Allocation
      2. 3.16.2  Alias Disambiguation
      3. 3.16.3  Branch Optimizations and Control-Flow Simplification
      4. 3.16.4  Data Flow Optimizations
      5. 3.16.5  Expression Simplification
      6. 3.16.6  Inline Expansion of Functions
      7. 3.16.7  Function Symbol Aliasing
      8. 3.16.8  Induction Variables and Strength Reduction
      9. 3.16.9  Loop-Invariant Code Motion
      10. 3.16.10 Loop Rotation
      11. 3.16.11 Instruction Scheduling
      12. 3.16.12 Register Variables
      13. 3.16.13 Register Tracking/Targeting
      14. 3.16.14 Tail Merging
      15. 3.16.15 Autoincrement Addressing
      16. 3.16.16 Removing Comparisons to Zero
      17. 3.16.17 RPTB Generation (for FPU Targets Only)
  6. 4 Linking C/C++ Code
    1. 4.1 Invoking the Linker Through the Compiler (-z Option)
      1. 4.1.1 Invoking the Linker Separately
      2. 4.1.2 Invoking the Linker as Part of the Compile Step
      3. 4.1.3 Disabling the Linker (--compile_only Compiler Option)
    2. 4.2 Linker Code Optimizations
      1. 4.2.1 Generating Function Subsections (--gen_func_subsections Compiler Option)
      2. 4.2.2 Generating Aggregate Data Subsections (--gen_data_subsections Compiler Option)
    3. 4.3 Controlling the Linking Process
      1. 4.3.1 Including the Run-Time-Support Library
        1. 4.3.1.1 Automatic Run-Time-Support Library Selection
          1. 4.3.1.1.1 Using the --issue_remarks Option
        2. 4.3.1.2 Manual Run-Time-Support Library Selection
        3. 4.3.1.3 Library Order for Searching for Symbols
      2. 4.3.2 Run-Time Initialization
      3. 4.3.3 Initialization by the Interrupt Vector
      4. 4.3.4 Global Object Constructors
      5. 4.3.5 Specifying the Type of Global Variable Initialization
      6. 4.3.6 Specifying Where to Allocate Sections in Memory
      7. 4.3.7 A Sample Linker Command File
    4. 4.4 Linking C28x and C2XLP Code
  7. 5 Post-Link Optimizer
    1. 5.1 The Post-Link Optimizer’s Role in the Software Development Flow
    2. 5.2 Removing Redundant DP Loads
    3. 5.3 Tracking DP Values Across Branches
    4. 5.4 Tracking DP Values Across Function Calls
    5. 5.5 Other Post-Link Optimizations
    6. 5.6 Controlling Post-Link Optimizations
      1. 5.6.1 Excluding Files (-ex Option)
      2. 5.6.2 Controlling Post-Link Optimization Within an Assembly File
      3. 5.6.3 Retaining Post-Link Optimizer Output (--keep_asm Option)
      4. 5.6.4 Disable Optimization Across Function Calls (-nf Option )
      5. 5.6.5 Annotating Assembly with Advice (--plink_advice_only option)
    7. 5.7 Restrictions on Using the Post-Link Optimizer
    8. 5.8 Naming the Outfile (--output_file Option)
  8. 6 C/C++ Language Implementation
    1. 6.1  Characteristics of TMS320C28x C
      1. 6.1.1 Implementation-Defined Behavior
    2. 6.2  Characteristics of TMS320C28x C++
    3. 6.3  Data Types
      1. 6.3.1 Size of Enum Types
      2. 6.3.2 Support for 64-Bit Integers
      3. 6.3.3 C28x double and long double Floating-Point Types
    4. 6.4  File Encodings and Character Sets
    5. 6.5  Keywords
      1. 6.5.1 The const Keyword
      2. 6.5.2 The __cregister Keyword
      3. 6.5.3 The __interrupt Keyword
      4. 6.5.4 The restrict Keyword
      5. 6.5.5 The volatile Keyword
    6. 6.6  C++ Exception Handling
    7. 6.7  Register Variables and Parameters
    8. 6.8  The __asm Statement
    9. 6.9  Pragma Directives
      1. 6.9.1  The CALLS Pragma
      2. 6.9.2  The CLINK Pragma
      3. 6.9.3  The CODE_ALIGN Pragma
      4. 6.9.4  The CODE_SECTION Pragma
      5. 6.9.5  The DATA_ALIGN Pragma
      6. 6.9.6  The DATA_SECTION Pragma
        1. 6.9.6.1 Using the DATA_SECTION Pragma C Source File
        2. 6.9.6.2 Using the DATA_SECTION Pragma C++ Source File
        3. 6.9.6.3 Using the DATA_SECTION Pragma Assembly Source File
      7. 6.9.7  The Diagnostic Message Pragmas
      8. 6.9.8  The FAST_FUNC_CALL Pragma
      9. 6.9.9  The FORCEINLINE Pragma
      10. 6.9.10 The FORCEINLINE_RECURSIVE Pragma
      11. 6.9.11 The FUNC_ALWAYS_INLINE Pragma
      12. 6.9.12 The FUNC_CANNOT_INLINE Pragma
      13. 6.9.13 The FUNC_EXT_CALLED Pragma
      14. 6.9.14 The FUNCTION_OPTIONS Pragma
      15. 6.9.15 The INTERRUPT Pragma
      16. 6.9.16 The LOCATION Pragma
      17. 6.9.17 The MUST_ITERATE Pragma
        1. 6.9.17.1 The MUST_ITERATE Pragma Syntax
        2. 6.9.17.2 Using MUST_ITERATE to Expand Compiler Knowledge of Loops
      18. 6.9.18 The NOINIT and PERSISTENT Pragmas
      19. 6.9.19 The NOINLINE Pragma
      20. 6.9.20 The NO_HOOKS Pragma
      21. 6.9.21 The once Pragma
      22. 6.9.22 The RETAIN Pragma
      23. 6.9.23 The SET_CODE_SECTION and SET_DATA_SECTION Pragmas
      24. 6.9.24 The UNROLL Pragma
      25. 6.9.25 The WEAK Pragma
    10. 6.10 The _Pragma Operator
    11. 6.11 Application Binary Interface
    12. 6.12 Object File Symbol Naming Conventions (Linknames)
    13. 6.13 Initializing Static and Global Variables in COFF ABI Mode
      1. 6.13.1 Initializing Static and Global Variables With the Linker
      2. 6.13.2 Initializing Static and Global Variables With the const Type Qualifier
    14. 6.14 Changing the ANSI/ISO C/C++ Language Mode
      1. 6.14.1 C99 Support (--c99)
      2. 6.14.2 C11 Support (--c11)
      3. 6.14.3 Strict ANSI Mode and Relaxed ANSI Mode (--strict_ansi and --relaxed_ansi)
    15. 6.15 GNU and Clang Language Extensions
      1. 6.15.1 Extensions
      2. 6.15.2 Function Attributes
      3. 6.15.3 For Loop Attributes
      4. 6.15.4 Variable Attributes
      5. 6.15.5 Type Attributes
      6. 6.15.6 Built-In Functions
      7. 6.15.7 Using the Byte Peripheral Type Attribute
    16. 6.16 Compiler Limits
  9. 7 Run-Time Environment
    1. 7.1  Memory Model
      1. 7.1.1 Sections
      2. 7.1.2 C/C++ System Stack
      3. 7.1.3 Allocating .econst to Program Memory
      4. 7.1.4 Dynamic Memory Allocation
      5. 7.1.5 Initialization of Variables
      6. 7.1.6 Allocating Memory for Static and Global Variables
      7. 7.1.7 Field/Structure Alignment
      8. 7.1.8 Character String Constants
    2. 7.2  Register Conventions
      1. 7.2.1 TMS320C28x Register Use and Preservation
      2. 7.2.2 Status Registers
    3. 7.3  Function Structure and Calling Conventions
      1. 7.3.1 How a Function Makes a Call
      2. 7.3.2 How a Called Function Responds
      3. 7.3.3 Special Case for a Called Function (Large Frames)
      4. 7.3.4 Accessing Arguments and Local Variables
      5. 7.3.5 Allocating the Frame and Accessing 32-Bit Values in Memory
    4. 7.4  Accessing Linker Symbols in C and C++
    5. 7.5  Interfacing C and C++ With Assembly Language
      1. 7.5.1 Using Assembly Language Modules With C/C++ Code
      2. 7.5.2 Accessing Assembly Language Functions From C/C++
        1. 7.5.2.1 Calling an Assembly Language Function From a C/C++ Program
        2. 7.5.2.2 Assembly Language Program Called by
        3.       261
      3. 7.5.3 Accessing Assembly Language Variables From C/C++
        1. 7.5.3.1 Accessing Assembly Language Global Variables
          1. 7.5.3.1.1 Assembly Language Variable Program
          2. 7.5.3.1.2 C Program to Access Assembly Language From
        2.       266
        3. 7.5.3.2 Accessing Assembly Language Constants
          1. 7.5.3.2.1 Accessing an Assembly Language Constant From C
          2. 7.5.3.2.2 Assembly Language Program for
          3.        270
      4. 7.5.4 Sharing C/C++ Header Files With Assembly Source
      5. 7.5.5 Using Inline Assembly Language
    6. 7.6  Using Intrinsics to Access Assembly Language Statements
      1. 7.6.1 Floating Point Conversion Intrinsics
      2. 7.6.2 Floating Point Unit (FPU) Intrinsics
      3. 7.6.3 Trigonometric Math Unit (TMU) Intrinsics
      4. 7.6.4 Fast Integer Division Intrinsics
    7. 7.7  Interrupt Handling
      1. 7.7.1 General Points About Interrupts
      2. 7.7.2 Using C/C++ Interrupt Routines
    8. 7.8  Integer Expression Analysis
      1. 7.8.1 Operations Evaluated With Run-Time-Support Calls
      2. 7.8.2 Division Operations with Fast Integer Division Support
      3. 7.8.3 C/C++ Code Access to the Upper 16 Bits of 16-Bit Multiply
    9. 7.9  Floating-Point Expression Analysis
    10. 7.10 System Initialization
      1. 7.10.1 Boot Hook Functions for System Pre-Initialization
      2. 7.10.2 Run-Time Stack
      3. 7.10.3 Automatic Initialization of Variables for COFF
        1. 7.10.3.1 Initialization Tables
        2.       291
        3. 7.10.3.2 Autoinitialization of Variables at Run Time for COFF
        4. 7.10.3.3 Initialization of Variables at Load Time for COFF
        5. 7.10.3.4 Global Constructors
      4. 7.10.4 Automatic Initialization of Variables for EABI
        1. 7.10.4.1 Zero Initializing Variables
        2. 7.10.4.2 Direct Initialization for EABI
        3. 7.10.4.3 Autoinitialization of Variables at Run Time for EABI
        4. 7.10.4.4 Autoinitialization Tables for EABI
          1. 7.10.4.4.1 Length Followed by Data Format
          2. 7.10.4.4.2 Zero Initialization Format
          3. 7.10.4.4.3 Run Length Encoded (RLE) Format
          4. 7.10.4.4.4 Lempel-Ziv-Storer-Szymanski Compression (LZSS) Format
        5. 7.10.4.5 Initialization of Variables at Load Time
        6. 7.10.4.6 Global Constructors
  10. 8 Using Run-Time-Support Functions and Building Libraries
    1. 8.1 C and C++ Run-Time Support Libraries
      1. 8.1.1 Linking Code With the Object Library
      2. 8.1.2 Header Files
      3. 8.1.3 Modifying a Library Function
      4. 8.1.4 Support for String Handling
      5. 8.1.5 Minimal Support for Internationalization
      6. 8.1.6 Support for Time and Clock Functions
      7. 8.1.7 Allowable Number of Open Files
      8. 8.1.8 Library Naming Conventions
    2. 8.2 The C I/O Functions
      1. 8.2.1 High-Level I/O Functions
        1. 8.2.1.1 Formatting and the Format Conversion Buffer
      2. 8.2.2 Overview of Low-Level I/O Implementation
        1.       open
        2.       close
        3.       read
        4.       write
        5.       lseek
        6.       unlink
        7.       rename
      3. 8.2.3 Device-Driver Level I/O Functions
        1.       DEV_open
        2.       DEV_close
        3.       DEV_read
        4.       DEV_write
        5.       DEV_lseek
        6.       DEV_unlink
        7.       DEV_rename
      4. 8.2.4 Adding a User-Defined Device Driver for C I/O
        1. 8.2.4.1 Mapping Default Streams to Device
      5. 8.2.5 The device Prefix
        1.       add_device
        2.       339
        3. 8.2.5.1 Program for C I/O Device
    3. 8.3 Handling Reentrancy (_register_lock() and _register_unlock() Functions)
    4. 8.4 Reinitializing Variables During a Warm Start
    5. 8.5 Library-Build Process
      1. 8.5.1 Required Non-Texas Instruments Software
      2. 8.5.2 Using the Library-Build Process
        1. 8.5.2.1 Automatic Standard Library Rebuilding by the Linker
        2. 8.5.2.2 Invoking mklib Manually
          1. 8.5.2.2.1 Building Standard Libraries
          2. 8.5.2.2.2 Shared or Read-Only Library Directory
          3. 8.5.2.2.3 Building Libraries With Custom Options
          4. 8.5.2.2.4 The mklib Program Option Summary
      3. 8.5.3 Extending mklib
        1. 8.5.3.1 Underlying Mechanism
        2. 8.5.3.2 Libraries From Other Vendors
  11. 9 C++ Name Demangler
    1. 9.1 Invoking the C++ Name Demangler
    2. 9.2 Sample Usage of the C++ Name Demangler
  12. 10CLA Compiler
    1. 10.1 How to Invoke the CLA Compiler
      1. 10.1.1 CLA-Specific Options
    2. 10.2 CLA C Language Implementation
      1. 10.2.1 Variables and Data Types
      2. 10.2.2 Pragmas, Keywords, and Intrinsics
      3. 10.2.3 Optimizations with the CLA Compiler
      4. 10.2.4 C Language Restrictions
      5. 10.2.5 Memory Model - Sections
      6. 10.2.6 Function Structure and Calling Conventions
  13.   A Glossary
    1.     369
  14.   B Revision History
  15.   B Earlier Revisions

2.3.1 Linker Options

The following tables list the linker options. See Chapter 4 of this document and the TMS320C28x Assembly Language Tools User's Guide for details on these options.

Table 2-20 Linker Basic Options
Option Alias Description
--run_linker -z Enables linking.
--output_file=file -o Names the executable output file. The default filename is a .out file.
--map_file=file -m Produces a map or listing of the input and output sections, including holes, and places the listing in file.
--stack_size=size [-]-stack Sets C system stack size to size words and defines a global symbol that specifies the stack size. Default = 1K words.
--heap_size=size [-]-heap Sets heap size (for the dynamic memory allocation in C) to sizewords and defines a global symbol that specifies the heap size. Default = 1K words.
--warn_sections -w Displays a message when an undefined output section is created.
Table 2-21 File Search Path Options
Option Alias Description
--library=file -l Names an archive library or link command file as linker input.
--disable_auto_rts Disables the automatic selection of a run-time-support library. See Section 4.3.1.1.
--priority -priority Satisfies unresolved references by the first library that contains a definition for that symbol.
--reread_libs -x Forces rereading of libraries, which resolves back references.
--search_path=pathname -I Alters library-search algorithms to look in a directory named with pathname before looking in the default location. This option must appear before the --library option.
Table 2-22 Command File Preprocessing Options
Option Alias Description
--define=name=value Predefines name as a preprocessor macro.
--undefine=name Removes the preprocessor macro name.
--disable_pp Disables preprocessing for command files.
Table 2-23 Diagnostic Message Options
Option Alias Description
--diag_error=num Categorizes the diagnostic identified by num as an error.
--diag_remark=num Categorizes the diagnostic identified by num as a remark.
--diag_suppress=num Suppresses the diagnostic identified by num.
--diag_warning=num Categorizes the diagnostic identified by num as a warning.
--display_error_number Displays a diagnostic's identifiers along with its text.
--emit_references:file[=file] Emits a file containing section information. The information includes section size, symbols defined, and references to symbols.
--emit_warnings_as_errors -pdew Treat warnings as errors.
--issue_remarks Issues remarks (non-serious warnings).
--no_demangle Disables demangling of symbol names in diagnostic messages.
--no_warnings Suppresses diagnostic warnings (errors are still issued).
--set_error_limit=count Sets the error limit to count. The linker abandons linking after this number of errors. (The default is 100.)
--verbose_diagnostics Provides verbose diagnostic messages that display the original source with line-wrap.
Table 2-24 Linker Output Options
Option Alias Description
--absolute_exe -a Produces an absolute, executable object file. This is the default; if neither --absolute_exe nor --relocatable is specified, the linker acts as if --absolute_exe were specified.
--ecc={ on | off } Enable linker-generated Error Correcting Codes (ECC). The default is off.
--ecc:data_error Inject specified errors into the output file for testing.
--ecc:ecc_error Inject specified errors into the Error Correcting Code (ECC) for testing.
--mapfile_contents=attribute Controls the information that appears in the map file.
--relocatable -r Produces a nonexecutable, relocatable output object file.
--run_abs -abs Produces an absolute listing file.
--xml_link_info=file Generates a well-formed XML file containing detailed information about the result of a link.
Table 2-25 Symbol Management Options
Option Alias Description
--entry_point=symbol -e Defines a global symbol that specifies the primary entry point for the executable object file.
--globalize=pattern Changes the symbol linkage to global for symbols that match pattern.
--hide=pattern Hides symbols that match the specified pattern.
--localize=pattern Make the symbols that match the specified pattern local.
--make_global=symbol -g Makes symbol global (overrides -h).
--make_static -h Makes all global symbols static.
--no_sym_merge -b Disables merge of symbolic debugging information in COFF object files.
--no_symtable -s Strips symbol table information and line number entries from the executable object file.
--retain Retains a list of sections that otherwise would be discarded. (EABI only)
--scan_libraries -scanlibs Scans all libraries for duplicate symbol definitions.
--symbol_map=refname=defname Specifies a symbol mapping; references to the refname symbol are replaced with references to the defname symbol. The --symbol_map option is supported when used with --opt_level=4.
--undef_sym=symbol -u Adds symbol to the symbol table as an unresolved symbol.
--unhide=pattern Excludes symbols that match the specified pattern from being hidden.
Table 2-26 Run-Time Environment Options
Option Alias Description
--arg_size=size --args Reserve size bytes for the argc/argv memory area.
--cinit_compression[=type] Specifies the type of compression to apply to the C auto initialization data. The default if this option is specified with no type is lzss for Lempel-Ziv-Storer-Szymanski compression. (EABI only)
--copy_compression[=type] Compresses data copied by linker copy tables. The default if this option is specified with no type is lzss for Lempel-Ziv-Storer-Szymanski compression. (EABI only)
--fill_value=value -f Sets default fill value for holes within output sections
--ram_model -cr Initializes variables at load time. See Section 4.3.5 for details.
--rom_model -c Autoinitializes variables at run time. See Section 4.3.5 for details.
Table 2-27 Link-Time Optimization Options
Option(1) Alias Description
--keep_asm Retain any post-link files (.pl) and .absolute listing files (.abs) generated by the −plink option. This allows you to view any changes the post-link optimizer makes. (Requires use of -plink)
--no_postlink_across_calls -nf Disable post-link optimizations across functions. (Requires use of -plink)
--plink_advice_only Annotates assembly code with comments if changes cannot be made safely due to pipeline considerations, such as when float support or VCU support is enabled. (Requires use of -plink)
--postlink_exclude -ex Exclude files from post-link pass. (Requires use of -plink)
--postlink_opt -plink Post-link optimizations (only after -z).
(1) See Section 5.6 for details.
Table 2-28 Miscellaneous Options
Option Alias Description
--compress_dwarf[=off|on] Aggressively reduces the size of DWARF information from input object files. Default is off.
--disable_clink -j Disables conditional linking of COFF object files. (COFF only)
--linker_help [-]-help Displays information about syntax and available options.
--preferred_order=function Prioritizes placement of functions.
--unused_section_elimination[=off|on] Eliminates sections that are not needed in the executable module. Default is on. (EABI only)
--zero_init=[off|on] Controls preinitialization of uninitialized variables. Default is on. Always off if --ram_model is used. (EABI only)