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Compiler-specific Features Example void Variable_Attributes_unused_0() { static int aStatic =0; int aUnused __attribute__ ((unused)); int bUnused; aStatic++; } In this example, the compiler warns that bUnused is declared but never referenced, but does not warn about aUnused. Note The GNU compiler does not give any warning. 4.5.10 __attribute__((used)) This variable attribute informs the compiler that a static variable is to be retained in the object file, even if it is unreferenced. Static variables marked as used are emitted to a single section, in the order they are declared. You can specify the section that variables are placed in using __attribute__((section)). Note This variable attribute is a GNU compiler extension that is supported by the ARM compiler. Note Static functions can also be marked as used using __attribute__((used)). Usage You can use __attribute__((used)) to build tables in the object. Example static int lose_this = 1; static int keep_this __attribute__((used)) = 2; // retained in object file static int keep_this_too __attribute__((used)) = 3; // retained in object file 4-54 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features See also • __attribute__((section("name"))) on page 4-52 • __attribute__((used)) on page 4-39. 4.5.11 __attribute__((visibility("visibility_type"))) This variable attribute affects the visibility of ELF symbols. Note This attribute is a GNU compiler extension supported by the ARM compiler. The possible values for visibility_type are the same as those specified for the function attribute of the same name. Example int i __attribute__((visibility(“hidden”))); See also • --arm_linux on page 2-9 • --hide_all, --no_hide_all on page 2-71 • __attribute__((visibility("visibility_type"))) on page 4-40. 4.5.12 __attribute__((weak)) The declaration of a weak variable is permitted, and acts in a similar way to __weak. • in GNU mode: extern int Variable_Attributes_weak_1 __attribute__((weak)); • the equivalent in non-GNU mode is: __weak int Variable_Attributes_weak_compare; Note The extern qualifier is required in GNU mode. In non-GNU mode the compiler assumes that if the variable is not extern then it is treated like any other non weak variable. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-55 ID101213 Non-Confidential,
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® RealView Compilation Tools Versi
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Product Status The information in t
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Contents RealView Compilation Tools
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Preface This preface introduces the
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Preface Appendix A Via File Syntax
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Preface Other publications The foll
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Chapter 1 Introduction This chapter
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Introduction 1.2 Source language mo
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Introduction 1.3 Language extension
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Introduction • Compiling a C sour
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Chapter 2 Compiler Command-line Opt
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Compiler Command-line Options 2.1.2
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Compiler Command-line Options Each
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Compiler Command-line Options Note
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Compiler Command-line Options • -
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Compiler Command-line Options Restr
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Compiler Command-line Options Defau
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Compiler Command-line Options Examp
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Compiler Command-line Options • a
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Compiler Command-line Options Synta
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Compiler Command-line Options • I
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Compiler Command-line Options See a
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Compiler Command-line Options Compi
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Compiler Command-line Options Selec
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Compiler Command-line Options • R
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Compiler Command-line Options Usage
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Compiler Command-line Options A num
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Compiler Command-line Options vfpv3
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Compiler Command-line Options The c
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Compiler Command-line Options #incl
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Compiler Command-line Options Error
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Compiler Command-line Options • a
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Compiler Command-line Options The i
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Compiler Command-line Options Error
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Chapter 3 Language Extensions This
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Language Extensions 3.1.2 #include_
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Language Extensions 3.2 C99 languag
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Language Extensions 3.3 C99 languag
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Language Extensions Restrictions Th
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Language Extensions static int y =
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Language Extensions 3.4.4 Dollar si
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Language Extensions 3.5 Standard C+
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Language Extensions Example 3-2 Lin
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Language Extensions 3.6 Standard C
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Language Extensions int counter __a
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Language Extensions 3.6.12 Structur
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Language Extensions 3.7 GNU languag
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Language Extensions 3.7.5 Character
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Language Extensions • You can use
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Language Extensions Errors The comp
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Chapter 4 Compiler-specific Feature
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Compiler-specific Features 4.7.39 _
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Compiler-specific Features 4.7.44 A
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Compiler-specific Features Table 4-
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Compiler-specific Features 4.7.47 A
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Compiler-specific Features • __uh
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Compiler-specific Features • Para
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Compiler-specific Features See also
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Compiler-specific Features 4.7.100
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Compiler-specific Features } int32_
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Compiler-specific Features 4.8 VFP
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Compiler-specific Features 4.10 GNU
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Compiler-specific Features __builti
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Chapter 5 C and C++ Implementation
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C and C++ Implementation Details th
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C and C++ Implementation Details Se
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C and C++ Implementation Details Po
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C and C++ Implementation Details
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C and C++ Implementation Details st
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C and C++ Implementation Details 5.
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C and C++ Implementation Details No
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C and C++ Implementation Details na
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C and C++ Implementation Details 5.
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Appendix A Via File Syntax This app
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Via File Syntax A.2 Syntax Via file
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Appendix B Standard C Implementatio
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Standard C Implementation Definitio
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Appendix C Standard C++ Implementat
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Standard C++ Implementation Definit
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Standard C++ Implementation Definit
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Appendix D C and C++ Compiler Imple
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C and C++ Compiler Implementation L
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C and C++ Compiler Implementation L
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Appendix E Using NEON Support This
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Using NEON Support E.2 Vector data
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Using NEON Support • Vector long
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Using NEON Support uint64x1_t vqadd
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Using NEON Support Vector multiply
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Using NEON Support int64x1_t vqsub_
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Using NEON Support uint32x2_t vcle_
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Using NEON Support uint16x4_t vabd_
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Using NEON Support Long pairwise ad
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Using NEON Support int16x8_t vqshlq
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Using NEON Support uint8x8_t vrshr_
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Using NEON Support Vector signed->u
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Using NEON Support uint8x16_t vld1q
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Using NEON Support int16x4_t lane);
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Using NEON Support // VST1.8 {d0},
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Using NEON Support uint64x1x2_t vld
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Using NEON Support float32x2x4_t vl
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Using NEON Support lane); // VLD2.8
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Using NEON Support // VLD4.16 {d0[0
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Using NEON Support // VST3.32 {d0,
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Using NEON Support // VST3.32 {d0[0
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Using NEON Support uint8x8_t vset_l
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Using NEON Support float32x2_t vmov
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Using NEON Support uint32x2_t vcvt_
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Using NEON Support // VMLA.I16 d0,
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Using NEON Support Vector long mult
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Using NEON Support Vector widening
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Using NEON Support int8x16_t vqabsq
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Using NEON Support Bitwise and int8
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Using NEON Support Bitwise Select N
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Using NEON Support E.3.31 Vector re
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