ARM Compiler toolchain Using the Linker - ARM Information Center

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3. At the location specified in ARMCCnnLIB. 4. At the location specified in ARMLIB. 4.24.4 How the linker selects ARM library variants 4.24.5 See also Image structure and generation The ARM Compiler toolchain includes a number of variants of each of the libraries, that are built using different build options. For example, architecture versions, endianness, and instruction set. The variant of the ARM library is coded into the library name. The linker must select the best-suited variant from each of the directories identified during the library search. The linker accumulates the attributes of each input object and then selects the library variant best suited to those attributes. If more than one of the selected libraries are equally suited, the linker retains the first library selected and rejects all others. Concepts • How the linker performs library searching, selection, and scanning on page 4-35. Reference Linker Reference: • --libpath=pathlist on page 2-96. Using ARM ® C and C++ Libraries and Floating-Point Support: • C and C++ library naming conventions on page 2-120. ARM ® C and C++ Libraries and Floating-Point Support Reference: • Chapter 2 The C and C++ libraries. Introducing the ARM Compiler toolchain: • Toolchain environment variables on page 2-14. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 4-37 ID080411 Non-Confidential
4.25 Specifying user libraries when linking 4.25.1 See also Image structure and generation To specify user libraries: • include them with path information explicitly in the input file list • add the --userlibpath option to the armlink command line with a comma-separated list of directories, and then specify the names of the libraries as input files. You can use the --library=name option to specify static libraries, libname.a, or dynamic shared objects, libname.so. Dynamic searching is controlled by the --search_dynamic_libraries option. For example, the following command searches for libfoo.so before libfoo.a: armlink --arm_linux --shared --fpic --search_dynamic_libraries --library=foo If you do not specify a full path name to a library on the command line, the linker tries to locate the library in the directories specified by the --userlibpath option. For example, if the directory /mylib contains my_lib.a and other_lib.a, add /mylib/my_lib.a to the input file list with the command: armlink --userlibpath /mylib my_lib.a *.o If you add a particular member from a library this does not add the library to the list of searchable libraries used by the linker. To load a specific member and add the library to the list of searchable libraries include the library filename on its own as well as specifying library(member). For example, to load strcmp.o and place mystring.lib on the searchable library list add the following to the input file list: mystring.lib(strcmp.o) mystring.lib Note Any search paths used for the ARM standard libraries specified by either the linker command-line option --libpath or the ARMLIB or ARMCC41LIB environment variables are not searched for user libraries. Tasks • Controlling how the linker searches for the ARM standard libraries on page 4-36. Reference Linker Reference: • --libpath=pathlist on page 2-96 • --library=name on page 2-97 • --search_dynamic_libraries, --no_search_dynamic_libraries on page 2-144 • --userlibpath=pathlist on page 2-179. ARM ® C and C++ Libraries and Floating-Point Support Reference: • Chapter 2 The C and C++ libraries. Introducing the ARM Compiler toolchain: • Toolchain environment variables on page 2-14. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 4-38 ID080411 Non-Confidential
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® ARM Copyright © 2010-2011 ARM.
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Contents ARM Compiler toolchain Usi
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Contents 7.15 Creating a symdefs fi
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Chapter 1 Conventions and feedback
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Chapter 2 Overview of the linker Th
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Concepts • Demand paging on page
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2.3 Linker command-line options lis
Page 15 and 16: • --keep_protected_symbols on pag
Page 17 and 18: • --eager_load_debug, --no_eager_
Page 19 and 20: 2.5 What the linker outputs 2.5.1 S
Page 21 and 22: Chapter 3 Linking models supported
Page 23 and 24: 3.2 Bare-metal linking model 3.2.1
Page 25 and 26: Linking models supported by armlink
Page 27 and 28: 3.5.1 See also • There are restri
Page 29 and 30: 3.7 Concepts common to both BPABI a
Page 31 and 32: Image structure and generation •
Page 33 and 34: 4.1.1 See also Image structure and
Page 35 and 36: 4.3 Load view and execution view of
Page 37 and 38: 4.4 Methods of specifying an image
Page 39 and 40: 4.5 Types of simple image 4.5.1 See
Page 47 and 48: 4.10 About specifying an initial en
Page 49 and 50: 4.11.2 Example 4.11.3 See also The
Page 51 and 52: 4.13 Section alignment with the lin
Page 53 and 54: Reference Linker Reference: • --a
Page 55 and 56: 4.16 Overview of veneers 4.16.1 See
Page 57 and 58: 4.18 Veneer types 4.18.1 See also I
Page 59 and 60: 4.20 Reuse of veneers when scatter-
Page 61 and 62: 4.22 About weak references and defi
Page 63 and 64: BL init_foo ;Rest of code END 4.22.
Page 65: Image structure and generation 4.24
Page 69 and 70: 4.27 Use of the strict family of op
Page 71 and 72: 5.1 Elimination of common debug sec
Page 73 and 74: 5.3 Elimination of unused sections
Page 75 and 76: 5.4 Elimination of unused virtual f
Page 77 and 78: • --scatter=file on page 2-142. C
Page 79 and 80: 5.6.1 See also Using linker optimiz
Page 81 and 82: 3. Creates the output image. 5.7.3
Page 83 and 84: 5.9 How the linker chooses a compre
Page 85 and 86: 5.11 How compression is applied 5.1
Page 87 and 88: 5.13 Inlining functions with the li
Page 89 and 90: Reference Assembler Reference: •
Page 91 and 92: 5.16 About reordering of tail calli
Page 93 and 94: 5.18 About merging comment sections
Page 95 and 96: 6.1 Linker options for getting info
Page 97 and 98: 6.3 Example of using the --info lin
Page 99 and 100: 6.4 How to find where a symbol is p
Page 101 and 102: • Load$$LR$$ load region symbols
Page 103 and 104: 7.2 Accessing linker-defined symbol
Page 105 and 106: 7.4 Image$$ execution region symbol
Page 107 and 108: 7.5.1 See also Accessing and managi
Page 109 and 110: 7.7 Region name values when not sca
Page 111 and 112: 7.9 Importing linker-defined symbol
Page 113 and 114: 7.11 Section-related symbols 7.11.1
Page 115 and 116: 7.13 Input section symbols 7.13.1 S
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7.15 Creating a symdefs file 7.15.1
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7.17 Reading a symdefs file 7.17.1
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7.18.2 See also 0x0000814D T __argv
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7.20 Specifying steering files on t
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7.22 Steering file format 7.22.1 Se
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7.24 Using $Super$$ and $Sub$$ to p
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Using scatter files • Images with
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8.2 When to use scatter-loading 8.2
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• --startup=symbol, --no_startup
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8.4.1 See also Concepts • About s
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8.5.1 See also } SRAM 0x8000 0x8000
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8.7 Specifying stack and heap using
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8.9 Creating root execution regions
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8.9.2 See also Tasks • Using the
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8.11 Placing functions and data at
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Using scatter files RAM 0x200000 (0
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Using scatter files • Using __at
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Developing Software for ARM ® Proc
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} } .ANY1(+RO) ; evenly distributed
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8.14 Examples of using placement al
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Using scatter files 8.15 Example of
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8.16 Examples of using sorting algo
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8.17 Selecting veneer input section
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Compiler Reference: • __attribute
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8.20 Restrictions on placing __at s
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8.21.1 See also Using scatter files
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8.23 Placing a key in flash memory
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8.25 Placement of sections with ove
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8.25.1 See also Using scatter files
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8.27 Example of placing code in a r
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8.29 Example of placing ARM C++ lib
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8.31 Reserving an empty region Usin
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8.32 About creating regions on page
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8.33 Overalignment of execution reg
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8.35 Expression evaluation in scatt
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8.37 Equivalent scatter-loading des
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Using scatter files Example 8-23 Po
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Using scatter files Example 8-25 Po
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Using scatter files • The ER_ZI e
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Using scatter files Example 8-29 Sc
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Chapter 9 GNU ld script support in
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9.2 Typical use cases for using ld
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Reference Linker Reference: • --l
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9.5 Recommendations for using ld sc
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.data : { __data_start = .; *(.data
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9.6.4 See also .got 0 : { *(.got.pl
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9.7.1 See also } .dynamic : { *(.dy
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9.8.1 See also { *(.bss .bss.*) . =
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Chapter 10 BPABI and SysV shared li
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BPABI and SysV shared libraries and
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10.3 Concepts common to all BPABI m
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10.5 Symbol visibility for BPABI mo
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10.6 Automatic import and export fo
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10.8 Symbol versioning for BPABI mo
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10.10 Linker options for SysV model
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10.13 Addressing modes in the SysV
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10.17 Linker options for bare metal
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10.21 Addressing modes in the BPABI
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10.23 About symbol versioning 10.23
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10.25 Example of creating versioned
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10.27 Linker options for enabling i
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Chapter 11 Features of the Base Pla
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Features of the Base Platform linki
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11.2 Example scatter file for the B
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Features of the Base Platform linki
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Change Topics affected Revisions fo
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