Welcome to gcc’s documentation!

Contents:

• Introduction
• Programming Languages Supported by GCC
• Language Standards Supported by GCC
• C Language
• C++ Language
• Objective-C and Objective-C++ Languages
• Go Language
• References for Other Languages
• GCC Command Options
• Option Summary
• Options Controlling the Kind of Output
• Compiling C++ Programs
• Options Controlling C Dialect
• Options Controlling C++ Dialect
• Options Controlling Objective-C and Objective-C++ Dialects
• Options to Control Diagnostic Messages Formatting
• Options to Request or Suppress Warnings
• Options for Debugging Your Program or GCC
• Options That Control Optimization
• Options Controlling the Preprocessor
• Passing Options to the Assembler
• Options for Linking
• Options for Directory Search
• Specifying Subprocesses and the Switches to Pass to Them
• Specifying Target Machine and Compiler Version
• Hardware Models and Configurations
• AArch64 Options
• Adapteva Epiphany Options
• ARC Options
• ARM Options
• AVR Options
• AVR Built-in Macros
• Blackfin Options
• C6X Options
• CRIS Options
• CR16 Options
• Darwin Options
• DEC Alpha Options
• FR30 Options
• FRV Options
• GNU/Linux Options
• H8/300 Options
• HPPA Options
• IA-64 Options
• LM32 Options
• M32C Options
• M32R/D Options
• M680x0 Options
• MCore Options
• MeP Options
• MicroBlaze Options
• MIPS Options
• MMIX Options
• MN10300 Options
• Moxie Options
• MSP430 Options
• NDS32 Options
• Nios II Options
• Nvidia PTX Options
• PDP-11 Options
• picoChip Options
• PowerPC Options
• RL78 Options
• IBM RS/6000 and PowerPC Options
• RX Options
• S/390 and zSeries Options
• Score Options
• SH Options
• Solaris 2 Options
• SPARC Options
• SPU Options
• Options for System V
• TILE-Gx Options
• TILEPro Options
• V850 Options
• VAX Options
• Visium Options
• VMS Options
• VxWorks Options
• x86 Options
• x86 Windows Options
• Xstormy16 Options
• Xtensa Options
• zSeries Options
• Options for Code Generation Conventions
• Environment Variables Affecting GCC
• Using Precompiled Headers
• C Implementation-Defined Behavior
• Translation
• Environment
• Identifiers
• Characters
• Integers
• Floating Point
• Arrays and Pointers
• Hints
• Structures, Unions, Enumerations, and Bit-Fields
• Qualifiers
• Declarators
• Statements
• Preprocessing Directives
• Library Functions
• Architecture
• Locale-Specific Behavior
• C++ Implementation-Defined Behavior
• Conditionally-Supported Behavior
• Exception Handling
• Extensions to the C Language Family
• Statements and Declarations in Expressions
• Locally Declared Labels
• Labels as Values
• Nested Functions
• Constructing Function Calls
• Conditionals with Omitted Operands
• 128-bit Integers
• Double-Word Integers
• Complex Numbers
• Additional Floating Types
• Half-Precision Floating Point
• Decimal Floating Types
• Hex Floats
• Fixed-Point Types
• Named Address Spaces
• AVR Named Address Spaces
• M32C Named Address Spaces
• RL78 Named Address Spaces
• SPU Named Address Spaces
• Arrays of Length Zero
• Structures with No Members
• Arrays of Variable Length
• Macros with a Variable Number of Arguments.
• Slightly Looser Rules for Escaped Newlines
• Non-Lvalue Arrays May Have Subscripts
• Pointers to Arrays with Qualifiers Work as Expected
• Non-Constant Initializers
• Compound Literals
• Designated Initializers
• Case Ranges
• Cast to a Union Type
• Mixed Declarations and Code
• Declaring Attributes of Functions
• Common Function Attributes
• ARC Function Attributes
• ARM Function Attributes
• AVR Function Attributes
• Blackfin Function Attributes
• CR16 Function Attributes
• Epiphany Function Attributes
• H8/300 Function Attributes
• IA-64 Function Attributes
• M32C Function Attributes
• M32R/D Function Attributes
• m68k Function Attributes
• MCORE Function Attributes
• MeP Function Attributes
• MicroBlaze Function Attributes
• Microsoft Windows Function Attributes
• MIPS Function Attributes
• MSP430 Function Attributes
• NDS32 Function Attributes
• Nios II Function Attributes
• PowerPC Function Attributes
• RL78 Function Attributes
• RX Function Attributes
• S/390 Function Attributes
• SH Function Attributes
• SPU Function Attributes
• Symbian OS Function Attributes
• Visium Function Attributes
• x86 Function Attributes
• Xstormy16 Function Attributes
• Specifying Attributes of Variables
• Common Variable Attributes
• AVR Variable Attributes
• Blackfin Variable Attributes
• H8/300 Variable Attributes
• IA-64 Variable Attributes
• M32R/D Variable Attributes
• MeP Variable Attributes
• Microsoft Windows Variable Attributes
• PowerPC Variable Attributes
• SPU Variable Attributes
• x86 Variable Attributes
• Xstormy16 Variable Attributes
• Specifying Attributes of Types
• Common Type Attributes
• ARM Type Attributes
• MeP Type Attributes
• PowerPC Type Attributes
• SPU Type Attributes
• x86 Type Attributes
• Label Attributes
• Attribute Syntax
  • Label Attributes
  • Type Attributes
  • All other attributes
• Prototypes and Old-Style Function Definitions
• C++ Style Comments
• Dollar Signs in Identifier Names
• Inquiring on Alignment of Types or Variables
• An Inline Function is As Fast As a Macro
• When is a Volatile Object Accessed?
• How to Use Inline Assembly Language in C Code
• Basic Asm Assembler Instructions Without Operands
  • Qualifiers
  • Parameters
  • Remarks
• Extended Asm - Assembler Instructions with C Expression Operands
  • Qualifiers
  • Parameters
  • Remarks
• Volatile
• Assembler Template
  • Special format strings
• Output Operands
• Input Operands
• Clobbers
• Goto Labels
• x86 Operand Modifiers
• Simple Constraints
• Multiple Alternative Constraints
• Constraint Modifier Characters
• Constraints for Particular Machines
• Controlling Names Used in Assembler Code
• Variables in Specified Registers
• Defining Global Register Variables
• Specifying Registers for Local Variables
• Alternate Keywords
• Function Names as Strings
• Getting the Return or Frame Address of a Function
• Using Vector Instructions through Built-in Functions
• Built-in Functions for Memory Model Aware Atomic Operations
• Built-in Functions to Perform Arithmetic with Overflow Checking
• x86-Specific Memory Model Extensions for Transactional Memory
• Object Size Checking Built-in Functions
• Pointer Bounds Checker Built-in Functions
• Cilk Plus C/C++ Language Extension Built-in Functions
• Other Built-in Functions Provided by GCC
• Built-in Functions Specific to Particular Target Machines
• AArch64 Built-in Functions
• Alpha Built-in Functions
• Altera Nios II Built-in Functions
• ARC Built-in Functions
• ARC SIMD Built-in Functions
• ARM iWMMXt Built-in Functions
• ARM C Language Extensions (ACLE)
• ARM Floating Point Status and Control Intrinsics
• AVR Built-in Functions
• Blackfin Built-in Functions
• FR-V Built-in Functions
• Argument Types
• Directly-Mapped Integer Functions
• Directly-Mapped Media Functions
• Raw Read/Write Functions
• Other Built-in Functions
• MIPS DSP Built-in Functions
• MIPS Paired-Single Support
• MIPS Loongson Built-in Functions
• Paired-Single Arithmetic
• Paired-Single Built-in Functions
• MIPS-3D Built-in Functions
• Other MIPS Built-in Functions
• MSP430 Built-in Functions
• NDS32 Built-in Functions
• picoChip Built-in Functions
• PowerPC Built-in Functions
• PowerPC AltiVec Built-in Functions
• PowerPC Hardware Transactional Memory Built-in Functions
• PowerPC HTM Low Level Built-in Functions
• PowerPC HTM High Level Inline Functions
• RX Built-in Functions
• S/390 System z Built-in Functions
• SH Built-in Functions
• SPARC VIS Built-in Functions
• SPU Built-in Functions
• TI C6X Built-in Functions
• TILE-Gx Built-in Functions
• TILEPro Built-in Functions
• x86 Built-in Functions
• x86 Transactional Memory Intrinsics
• Format Checks Specific to Particular Target Machines
• Solaris Format Checks
• Darwin Format Checks
• Pragmas Accepted by GCC
• ARM Pragmas
• M32C Pragmas
• MeP Pragmas
• RS/6000 and PowerPC Pragmas
• Darwin Pragmas
• Solaris Pragmas
• Symbol-Renaming Pragmas
• Structure-Packing Pragmas
• Weak Pragmas
• Diagnostic Pragmas
• Visibility Pragmas
• Push/Pop Macro Pragmas
• Function Specific Option Pragmas
• Loop-Specific Pragmas
• Unnamed Structure and Union Fields
• Thread-Local Storage
• ISO/IEC 9899:1999 Edits for Thread-Local Storage
• ISO/IEC 14882:1998 Edits for Thread-Local Storage
• Extensions to the C++ Language
• When is a Volatile C++ Object Accessed?
• Restricting Pointer Aliasing
• Vague Linkage
• C++ Interface and Implementation Pragmas
• Wheres the Template?
• Extracting the Function Pointer from a Bound Pointer to Member Function
• C++-Specific Variable, Function, and Type Attributes
• Function Multiversioning
• Namespace Association
• Type Traits
• Java Exceptions
• Deprecated Features
• Backwards Compatibility
• GNU Objective-C Features
• GNU Objective-C Runtime API
• Modern GNU Objective-C Runtime API
• Traditional GNU Objective-C Runtime API
• Type Encoding
• Legacy Type Encoding
• Method Signatures
• Garbage Collection
• Constant String Objects
• Exceptions
• Synchronization
• Fast Enumeration
• Using Fast Enumeration
• C99-Like Fast Enumeration Syntax
• Fast Enumeration Details
• Fast Enumeration Protocol
• Messaging with the GNU Objective-C Runtime
• Dynamically Registering Methods
• Forwarding Hook
• Binary Compatibility
• Data File Relocation to Support Cross-Profiling
• Known Causes of Trouble with GCC
• Actual Bugs We Havent Fixed Yet
• Interoperation
• Incompatibilities of GCC
• Fixed Header Files
• Standard Libraries
• Disappointments and Misunderstandings
• Common Misunderstandings with GNU C++
• Name Lookup, Templates, and Accessing Members of Base Classes
• Temporaries May Vanish Before You Expect
• Implicit Copy-Assignment for Virtual Bases
• Certain Changes We Dont Want to Make
• Warning Messages and Error Messages
• Reporting Bugs
• Have You Found a Bug?
• How and Where to Report Bugs
• How To Get Help with GCC
• Contributing to GCC Development
• Funding Free Software
• The GNU Project and GNU/Linux
• GNU General Public License

Indices and tables

• Index
• Module Index
• Search Page