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/usr/src/gnu/usr.bin/gcc/gcc/doc/gcc.texi.

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Back-Cover Texts being (b) (see below).  A copy of the license is
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   (a) The FSF's Front-Cover Text is:

   A GNU Manual

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   You have freedom to copy and modify this GNU Manual, like GNU
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INFO-DIR-SECTION Programming
START-INFO-DIR-ENTRY
* gcc: (gcc).                  The GNU Compiler Collection.
END-INFO-DIR-ENTRY
   This file documents the use of the GNU compilers.

   Published by the Free Software Foundation
59 Temple Place - Suite 330
Boston, MA 02111-1307 USA

File: gcc.info,  Node: Keyword Index,  Prev: Option Index,  Up: Top

Keyword Index
*************

* Menu:

* ! in constraint:                       Multi-Alternative.
* # in constraint:                       Modifiers.
* #pragma:                               Pragmas.
* #pragma implementation:                C++ Interface.
* #pragma implementation, implied:       C++ Interface.
* #pragma interface:                     C++ Interface.
* #pragma, reason for not using:         Function Attributes.
* $:                                     Dollar Signs.
* % in constraint:                       Modifiers.
* %include:                              Spec Files.
* %include_noerr:                        Spec Files.
* %rename:                               Spec Files.
* & in constraint:                       Modifiers.
* ':                                     Incompatibilities.
* * in constraint:                       Modifiers.
* + in constraint:                       Modifiers.
* -lgcc, use with -nodefaultlibs:        Link Options.
* -lgcc, use with -nostdlib:             Link Options.
* -nodefaultlibs and unresolved references: Link Options.
* -nostdlib and unresolved references:   Link Options.
* .sdata/.sdata2 references (PowerPC):   RS/6000 and PowerPC Options.
* //:                                    C++ Comments.
* 0 in constraint:                       Simple Constraints.
* < in constraint:                       Simple Constraints.
* <?:                                    Min and Max.
* = in constraint:                       Modifiers.
* > in constraint:                       Simple Constraints.
* >?:                                    Min and Max.
* ? in constraint:                       Multi-Alternative.
* ?: extensions <1>:                     Conditionals.
* ?: extensions:                         Lvalues.
* ?: side effect:                        Conditionals.
* _ in variables in macros:              Typeof.
* __builtin_apply:                       Constructing Calls.
* __builtin_apply_args:                  Constructing Calls.
* __builtin_choose_expr:                 Other Builtins.
* __builtin_constant_p:                  Other Builtins.
* __builtin_expect:                      Other Builtins.
* __builtin_frame_address:               Return Address.
* __builtin_huge_val:                    Other Builtins.
* __builtin_huge_valf:                   Other Builtins.
* __builtin_huge_vall:                   Other Builtins.
* __builtin_inf:                         Other Builtins.
* __builtin_inff:                        Other Builtins.
* __builtin_infl:                        Other Builtins.
* __builtin_isgreater:                   Other Builtins.
* __builtin_isgreaterequal:              Other Builtins.
* __builtin_isless:                      Other Builtins.
* __builtin_islessequal:                 Other Builtins.
* __builtin_islessgreater:               Other Builtins.
* __builtin_isunordered:                 Other Builtins.
* __builtin_nan:                         Other Builtins.
* __builtin_nanf:                        Other Builtins.
* __builtin_nanl:                        Other Builtins.
* __builtin_nans:                        Other Builtins.
* __builtin_nansf:                       Other Builtins.
* __builtin_nansl:                       Other Builtins.
* __builtin_prefetch:                    Other Builtins.
* __builtin_return:                      Constructing Calls.
* __builtin_return_address:              Return Address.
* __builtin_types_compatible_p:          Other Builtins.
* __complex__ keyword:                   Complex.
* __declspec(dllexport):                 Function Attributes.
* __declspec(dllimport):                 Function Attributes.
* __extension__:                         Alternate Keywords.
* __func__ identifier:                   Function Names.
* __FUNCTION__ identifier:               Function Names.
* __imag__ keyword:                      Complex.
* __PRETTY_FUNCTION__ identifier:        Function Names.
* __real__ keyword:                      Complex.
* __STDC_HOSTED__:                       Standards.
* __thread:                              Thread-Local.
* _Complex keyword:                      Complex.
* _exit:                                 Other Builtins.
* _Exit:                                 Other Builtins.
* ABI:                                   Compatibility.
* abort:                                 Other Builtins.
* abs:                                   Other Builtins.
* accessing volatiles:                   Volatiles.
* Ada:                                   G++ and GCC.
* address constraints:                   Simple Constraints.
* address of a label:                    Labels as Values.
* address_operand:                       Simple Constraints.
* alias attribute:                       Function Attributes.
* aliasing of parameters:                Code Gen Options.
* aligned attribute <1>:                 Type Attributes.
* aligned attribute:                     Variable Attributes.
* alignment:                             Alignment.
* alloca:                                Other Builtins.
* alloca vs variable-length arrays:      Variable Length.
* alternate keywords:                    Alternate Keywords.
* always_inline function attribute:      Function Attributes.
* AMD x86-64 Options:                    i386 and x86-64 Options.
* AMD1:                                  Standards.
* ANSI C:                                Standards.
* ANSI C standard:                       Standards.
* ANSI C89:                              Standards.
* ANSI support:                          C Dialect Options.
* ANSI X3.159-1989:                      Standards.
* apostrophes:                           Incompatibilities.
* application binary interface:          Compatibility.
* ARC Options:                           ARC Options.
* arguments in frame (88k):              M88K Options.
* ARM [Annotated C++ Reference Manual]:  Backwards Compatibility.
* ARM options:                           ARM Options.
* arrays of length zero:                 Zero Length.
* arrays of variable length:             Variable Length.
* arrays, non-lvalue:                    Subscripting.
* asm constraints:                       Constraints.
* asm expressions:                       Extended Asm.
* assembler instructions:                Extended Asm.
* assembler names for identifiers:       Asm Labels.
* assembler syntax, 88k:                 M88K Options.
* assembly code, invalid:                Bug Criteria.
* attribute of types:                    Type Attributes.
* attribute of variables:                Variable Attributes.
* attribute syntax:                      Attribute Syntax.
* autoincrement/decrement addressing:    Simple Constraints.
* automatic inline for C++ member fns:   Inline.
* AVR Options:                           AVR Options.
* Backwards Compatibility:               Backwards Compatibility.
* bcmp:                                  Other Builtins.
* binary compatibility:                  Compatibility.
* bit shift overflow (88k):              M88K Options.
* bound pointer to member function:      Bound member functions.
* bug criteria:                          Bug Criteria.
* bugs:                                  Bugs.
* bugs, known:                           Trouble.
* built-in functions <1>:                C Dialect Options.
* built-in functions:                    Other Builtins.
* bzero:                                 Other Builtins.
* C compilation options:                 Invoking GCC.
* C intermediate output, nonexistent:    G++ and GCC.
* C language extensions:                 C Extensions.
* C language, traditional:               C Dialect Options.
* C standard:                            Standards.
* C standards:                           Standards.
* c++:                                   Invoking G++.
* C++:                                   G++ and GCC.
* C++ comments:                          C++ Comments.
* C++ compilation options:               Invoking GCC.
* C++ interface and implementation headers: C++ Interface.
* C++ language extensions:               C++ Extensions.
* C++ member fns, automatically inline:  Inline.
* C++ misunderstandings:                 C++ Misunderstandings.
* C++ options, command line:             C++ Dialect Options.
* C++ pragmas, effect on inlining:       C++ Interface.
* C++ source file suffixes:              Invoking G++.
* C++ static data, declaring and defining: Static Definitions.
* C89:                                   Standards.
* C90:                                   Standards.
* C94:                                   Standards.
* C95:                                   Standards.
* C99:                                   Standards.
* C9X:                                   Standards.
* C_INCLUDE_PATH:                        Environment Variables.
* calling functions through the function vector on the H8/300 processors: Function Attributes.
* case labels in initializers:           Designated Inits.
* case ranges:                           Case Ranges.
* cast to a union:                       Cast to Union.
* casts as lvalues:                      Lvalues.
* cimag:                                 Other Builtins.
* cimagf:                                Other Builtins.
* cimagl:                                Other Builtins.
* cleanup attribute:                     Variable Attributes.
* code generation conventions:           Code Gen Options.
* code, mixed with declarations:         Mixed Declarations.
* command options:                       Invoking GCC.
* comments, C++ style:                   C++ Comments.
* common attribute:                      Variable Attributes.
* comparison of signed and unsigned values, warning: Warning Options.
* compiler bugs, reporting:              Bug Reporting.
* compiler compared to C++ preprocessor: G++ and GCC.
* compiler options, C++:                 C++ Dialect Options.
* compiler options, Objective-C:         Objective-C Dialect Options.
* compiler version, specifying:          Target Options.
* COMPILER_PATH:                         Environment Variables.
* complex conjugation:                   Complex.
* complex numbers:                       Complex.
* compound expressions as lvalues:       Lvalues.
* compound literals:                     Compound Literals.
* computed gotos:                        Labels as Values.
* conditional expressions as lvalues:    Lvalues.
* conditional expressions, extensions:   Conditionals.
* conflicting types:                     Disappointments.
* conj:                                  Other Builtins.
* conjf:                                 Other Builtins.
* conjl:                                 Other Builtins.
* const applied to function:             Function Attributes.
* const function attribute:              Function Attributes.
* constants in constraints:              Simple Constraints.
* constraint modifier characters:        Modifiers.
* constraint, matching:                  Simple Constraints.
* constraints, asm:                      Constraints.
* constraints, machine specific:         Machine Constraints.
* constructing calls:                    Constructing Calls.
* constructor expressions:               Compound Literals.
* constructor function attribute:        Function Attributes.
* contributors:                          Contributors.
* core dump:                             Bug Criteria.
* cos:                                   Other Builtins.
* cosf:                                  Other Builtins.
* cosl:                                  Other Builtins.
* CPATH:                                 Environment Variables.
* CPLUS_INCLUDE_PATH:                    Environment Variables.
* creal:                                 Other Builtins.
* crealf:                                Other Builtins.
* creall:                                Other Builtins.
* CRIS Options:                          CRIS Options.
* cross compiling:                       Target Options.
* D30V Options:                          D30V Options.
* Darwin options:                        Darwin Options.
* DBX:                                   Interoperation.
* deallocating variable length arrays:   Variable Length.
* debugging information options:         Debugging Options.
* debugging, 88k OCS:                    M88K Options.
* declaration scope:                     Incompatibilities.
* declarations inside expressions:       Statement Exprs.
* declarations, mixed with code:         Mixed Declarations.
* declaring attributes of functions:     Function Attributes.
* declaring static data in C++:          Static Definitions.
* defining static data in C++:           Static Definitions.
* dependencies for make as output:       Environment Variables.
* dependencies, make:                    Preprocessor Options.
* DEPENDENCIES_OUTPUT:                   Environment Variables.
* deprecated attribute:                  Variable Attributes.
* deprecated attribute.:                 Function Attributes.
* designated initializers:               Designated Inits.
* designator lists:                      Designated Inits.
* designators:                           Designated Inits.
* destructor function attribute:         Function Attributes.
* diagnostic messages:                   Language Independent Options.
* dialect options:                       C Dialect Options.
* digits in constraint:                  Simple Constraints.
* directory options:                     Directory Options.
* divide instruction, 88k:               M88K Options.
* dollar signs in identifier names:      Dollar Signs.
* double-word arithmetic:                Long Long.
* downward funargs:                      Nested Functions.
* E in constraint:                       Simple Constraints.
* earlyclobber operand:                  Modifiers.
* eight bit data on the H8/300 and H8/300H: Function Attributes.
* empty structures:                      Empty Structures.
* environment variables:                 Environment Variables.
* error messages:                        Warnings and Errors.
* escaped newlines:                      Escaped Newlines.
* exclamation point:                     Multi-Alternative.
* exit:                                  Other Builtins.
* exp:                                   Other Builtins.
* expf:                                  Other Builtins.
* expl:                                  Other Builtins.
* explicit register variables:           Explicit Reg Vars.
* expressions containing statements:     Statement Exprs.
* expressions, compound, as lvalues:     Lvalues.
* expressions, conditional, as lvalues:  Lvalues.
* expressions, constructor:              Compound Literals.
* extended asm:                          Extended Asm.
* extensible constraints:                Simple Constraints.
* extensions, ?: <1>:                    Conditionals.
* extensions, ?::                        Lvalues.
* extensions, C language:                C Extensions.
* extensions, C++ language:              C++ Extensions.
* external declaration scope:            Incompatibilities.
* F in constraint:                       Simple Constraints.
* fabs:                                  Other Builtins.
* fabsf:                                 Other Builtins.
* fabsl:                                 Other Builtins.
* fatal signal:                          Bug Criteria.
* FDL, GNU Free Documentation License:   GNU Free Documentation License.
* ffs:                                   Other Builtins.
* file name suffix:                      Overall Options.
* file names:                            Link Options.
* flexible array members:                Zero Length.
* float as function value type:          Incompatibilities.
* floating point precision <1>:          Disappointments.
* floating point precision:              Optimize Options.
* format function attribute:             Function Attributes.
* format_arg function attribute:         Function Attributes.
* Fortran:                               G++ and GCC.
* forwarding calls:                      Constructing Calls.
* fprintf:                               Other Builtins.
* fprintf_unlocked:                      Other Builtins.
* fputs:                                 Other Builtins.
* fputs_unlocked:                        Other Builtins.
* freestanding environment:              Standards.
* freestanding implementation:           Standards.
* FRV Options:                           FRV Options.
* fscanf, and constant strings:          Incompatibilities.
* function addressability on the M32R/D: Function Attributes.
* function attributes:                   Function Attributes.
* function pointers, arithmetic:         Pointer Arith.
* function prototype declarations:       Function Prototypes.
* function without a prologue/epilogue code: Function Attributes.
* function, size of pointer to:          Pointer Arith.
* functions called via pointer on the RS/6000 and PowerPC: Function Attributes.
* functions in arbitrary sections:       Function Attributes.
* functions that are passed arguments in registers on the 386: Function Attributes.
* functions that behave like malloc:     Function Attributes.
* functions that do not pop the argument stack on the 386: Function Attributes.
* functions that do pop the argument stack on the 386: Function Attributes.
* functions that have no side effects:   Function Attributes.
* functions that never return:           Function Attributes.
* functions that pop the argument stack on the 386: Function Attributes.
* functions which do not handle memory bank switching on 68HC11/68HC12: Function Attributes.
* functions which handle memory bank switching: Function Attributes.
* functions with non-null pointer arguments: Function Attributes.
* functions with printf, scanf, strftime or strfmon style arguments: Function Attributes.
* G in constraint:                       Simple Constraints.
* g in constraint:                       Simple Constraints.
* g++:                                   Invoking G++.
* G++:                                   G++ and GCC.
* GCC:                                   G++ and GCC.
* GCC command options:                   Invoking GCC.
* GCC_EXEC_PREFIX:                       Environment Variables.
* generalized lvalues:                   Lvalues.
* global offset table:                   Code Gen Options.
* global register after longjmp:         Global Reg Vars.
* global register variables:             Global Reg Vars.
* GNAT:                                  G++ and GCC.
* goto with computed label:              Labels as Values.
* gp-relative references (MIPS):         MIPS Options.
* gprof:                                 Debugging Options.
* grouping options:                      Invoking GCC.
* H in constraint:                       Simple Constraints.
* hardware models and configurations, specifying: Submodel Options.
* hex floats:                            Hex Floats.
* hosted environment <1>:                Standards.
* hosted environment:                    C Dialect Options.
* hosted implementation:                 Standards.
* HPPA Options:                          HPPA Options.
* i in constraint:                       Simple Constraints.
* I in constraint:                       Simple Constraints.
* i386 Options:                          i386 and x86-64 Options.
* IA-64 Options:                         IA-64 Options.
* IBM RS/6000 and PowerPC Options:       RS/6000 and PowerPC Options.
* IBM RT options:                        RT Options.
* identifier names, dollar signs in:     Dollar Signs.
* identifiers, names in assembler code:  Asm Labels.
* identifying source, compiler (88k):    M88K Options.
* imaxabs:                               Other Builtins.
* implementation-defined behavior, C language: C Implementation.
* implied #pragma implementation:        C++ Interface.
* incompatibilities of GCC:              Incompatibilities.
* increment operators:                   Bug Criteria.
* index:                                 Other Builtins.
* indirect calls on ARM:                 Function Attributes.
* init_priority attribute:               C++ Attributes.
* initializations in expressions:        Compound Literals.
* initializers with labeled elements:    Designated Inits.
* initializers, non-constant:            Initializers.
* inline automatic for C++ member fns:   Inline.
* inline functions:                      Inline.
* inline functions, omission of:         Inline.
* inlining and C++ pragmas:              C++ Interface.
* installation trouble:                  Trouble.
* integrating function code:             Inline.
* Intel 386 Options:                     i386 and x86-64 Options.
* interface and implementation headers, C++: C++ Interface.
* intermediate C version, nonexistent:   G++ and GCC.
* interrupt handler functions:           Function Attributes.
* interrupt handler functions on the H8/300 and SH processors: Function Attributes.
* introduction:                          Top.
* invalid assembly code:                 Bug Criteria.
* invalid input:                         Bug Criteria.
* invoking g++:                          Invoking G++.
* ISO 9899:                              Standards.
* ISO C:                                 Standards.
* ISO C standard:                        Standards.
* ISO C90:                               Standards.
* ISO C94:                               Standards.
* ISO C95:                               Standards.
* ISO C99:                               Standards.
* ISO C9X:                               Standards.
* ISO support:                           C Dialect Options.
* ISO/IEC 9899:                          Standards.
* Java:                                  G++ and GCC.
* java_interface attribute:              C++ Attributes.
* keywords, alternate:                   Alternate Keywords.
* known causes of trouble:               Trouble.
* labeled elements in initializers:      Designated Inits.
* labels as values:                      Labels as Values.
* labs:                                  Other Builtins.
* LANG:                                  Environment Variables.
* language dialect options:              C Dialect Options.
* large bit shifts (88k):                M88K Options.
* LC_ALL:                                Environment Variables.
* LC_CTYPE:                              Environment Variables.
* LC_MESSAGES:                           Environment Variables.
* length-zero arrays:                    Zero Length.
* Libraries:                             Link Options.
* LIBRARY_PATH:                          Environment Variables.
* link options:                          Link Options.
* LL integer suffix:                     Long Long.
* llabs:                                 Other Builtins.
* load address instruction:              Simple Constraints.
* local labels:                          Local Labels.
* local variables in macros:             Typeof.
* local variables, specifying registers: Local Reg Vars.
* locale:                                Environment Variables.
* locale definition:                     Environment Variables.
* log:                                   Other Builtins.
* logf:                                  Other Builtins.
* logl:                                  Other Builtins.
* long long data types:                  Long Long.
* longjmp:                               Global Reg Vars.
* longjmp incompatibilities:             Incompatibilities.
* longjmp warnings:                      Warning Options.
* lvalues, generalized:                  Lvalues.
* m in constraint:                       Simple Constraints.
* M32R/D options:                        M32R/D Options.
* M680x0 options:                        M680x0 Options.
* M68hc1x options:                       M68hc1x Options.
* M88k options:                          M88K Options.
* machine dependent options:             Submodel Options.
* machine specific constraints:          Machine Constraints.
* macro with variable arguments:         Variadic Macros.
* macros containing asm:                 Extended Asm.
* macros, inline alternative:            Inline.
* macros, local labels:                  Local Labels.
* macros, local variables in:            Typeof.
* macros, statements in expressions:     Statement Exprs.
* macros, types of arguments:            Typeof.
* make:                                  Preprocessor Options.
* malloc attribute:                      Function Attributes.
* matching constraint:                   Simple Constraints.
* maximum operator:                      Min and Max.
* MCore options:                         MCore Options.
* member fns, automatically inline:      Inline.
* memcmp:                                Other Builtins.
* memcpy:                                Other Builtins.
* memory references in constraints:      Simple Constraints.
* memset:                                Other Builtins.
* message formatting:                    Language Independent Options.
* messages, warning:                     Warning Options.
* messages, warning and error:           Warnings and Errors.
* middle-operands, omitted:              Conditionals.
* minimum operator:                      Min and Max.
* MIPS options:                          MIPS Options.
* misunderstandings in C++:              C++ Misunderstandings.
* mixed declarations and code:           Mixed Declarations.
* mktemp, and constant strings:          Incompatibilities.
* MMIX Options:                          MMIX Options.
* MN10200 options:                       MN10200 Options.
* MN10300 options:                       MN10300 Options.
* mode attribute:                        Variable Attributes.
* modifiers in constraints:              Modifiers.
* multiple alternative constraints:      Multi-Alternative.
* multiprecision arithmetic:             Long Long.
* n in constraint:                       Simple Constraints.
* names used in assembler code:          Asm Labels.
* naming convention, implementation headers: C++ Interface.
* nested functions:                      Nested Functions.
* newlines (escaped):                    Escaped Newlines.
* no_instrument_function function attribute: Function Attributes.
* nocommon attribute:                    Variable Attributes.
* noinline function attribute:           Function Attributes.
* non-constant initializers:             Initializers.
* non-static inline function:            Inline.
* nonnull function attribute:            Function Attributes.
* noreturn function attribute:           Function Attributes.
* nothrow function attribute:            Function Attributes.
* NS32K options:                         NS32K Options.
* o in constraint:                       Simple Constraints.
* OBJC_INCLUDE_PATH:                     Environment Variables.
* Objective-C:                           G++ and GCC.
* Objective-C options, command line:     Objective-C Dialect Options.
* OCS (88k):                             M88K Options.
* offsettable address:                   Simple Constraints.
* old-style function definitions:        Function Prototypes.
* omitted middle-operands:               Conditionals.
* open coding:                           Inline.
* operand constraints, asm:              Constraints.
* optimize options:                      Optimize Options.
* options to control diagnostics formatting: Language Independent Options.
* options to control warnings:           Warning Options.
* options, C++:                          C++ Dialect Options.
* options, code generation:              Code Gen Options.
* options, debugging:                    Debugging Options.
* options, dialect:                      C Dialect Options.
* options, directory search:             Directory Options.
* options, GCC command:                  Invoking GCC.
* options, grouping:                     Invoking GCC.
* options, linking:                      Link Options.
* options, Objective-C:                  Objective-C Dialect Options.
* options, optimization:                 Optimize Options.
* options, order:                        Invoking GCC.
* options, preprocessor:                 Preprocessor Options.
* order of evaluation, side effects:     Non-bugs.
* order of options:                      Invoking GCC.
* other register constraints:            Simple Constraints.
* output file option:                    Overall Options.
* overloaded virtual fn, warning:        C++ Dialect Options.
* p in constraint:                       Simple Constraints.
* packed attribute:                      Variable Attributes.
* parameter forward declaration:         Variable Length.
* parameters, aliased:                   Code Gen Options.
* PDP-11 Options:                        PDP-11 Options.
* PIC:                                   Code Gen Options.
* pmf:                                   Bound member functions.
* pointer arguments:                     Function Attributes.
* pointer to member function:            Bound member functions.
* portions of temporary objects, pointers to: Temporaries.
* pragma, extern_prefix:                 Tru64 Pragmas.
* pragma, long_calls:                    ARM Pragmas.
* pragma, long_calls_off:                ARM Pragmas.
* pragma, longcall:                      RS/6000 and PowerPC Pragmas.
* pragma, mark:                          Darwin Pragmas.
* pragma, no_long_calls:                 ARM Pragmas.
* pragma, options align:                 Darwin Pragmas.
* pragma, reason for not using:          Function Attributes.
* pragma, redefine_extname:              Solaris Pragmas.
* pragma, segment:                       Darwin Pragmas.
* pragma, unused:                        Darwin Pragmas.
* pragmas:                               Pragmas.
* pragmas in C++, effect on inlining:    C++ Interface.
* pragmas, interface and implementation: C++ Interface.
* pragmas, warning of unknown:           Warning Options.
* preprocessing numbers:                 Incompatibilities.
* preprocessing tokens:                  Incompatibilities.
* preprocessor options:                  Preprocessor Options.
* printf:                                Other Builtins.
* printf_unlocked:                       Other Builtins.
* prof:                                  Debugging Options.
* promotion of formal parameters:        Function Prototypes.
* pure function attribute:               Function Attributes.
* push address instruction:              Simple Constraints.
* putchar:                               Other Builtins.
* puts:                                  Other Builtins.
* qsort, and global register variables:  Global Reg Vars.
* question mark:                         Multi-Alternative.
* r in constraint:                       Simple Constraints.
* r0-relative references (88k):          M88K Options.
* ranges in case statements:             Case Ranges.
* read-only strings:                     Incompatibilities.
* register positions in frame (88k):     M88K Options.
* register variable after longjmp:       Global Reg Vars.
* registers:                             Extended Asm.
* registers for local variables:         Local Reg Vars.
* registers in constraints:              Simple Constraints.
* registers, global allocation:          Explicit Reg Vars.
* registers, global variables in:        Global Reg Vars.
* regparm attribute:                     Function Attributes.
* reordering, warning:                   C++ Dialect Options.
* reporting bugs:                        Bugs.
* rest argument (in macro):              Variadic Macros.
* restricted pointers:                   Restricted Pointers.
* restricted references:                 Restricted Pointers.
* restricted this pointer:               Restricted Pointers.
* rindex:                                Other Builtins.
* RS/6000 and PowerPC Options:           RS/6000 and PowerPC Options.
* RT options:                            RT Options.
* RTTI:                                  Vague Linkage.
* run-time options:                      Code Gen Options.
* s in constraint:                       Simple Constraints.
* S/390 and zSeries Options:             S/390 and zSeries Options.
* scanf:                                 Other Builtins.
* scanf, and constant strings:           Incompatibilities.
* scope of a variable length array:      Variable Length.
* scope of declaration:                  Disappointments.
* scope of external declarations:        Incompatibilities.
* search path:                           Directory Options.
* section function attribute:            Function Attributes.
* section variable attribute:            Variable Attributes.
* sequential consistency on 88k:         M88K Options.
* setjmp:                                Global Reg Vars.
* setjmp incompatibilities:              Incompatibilities.
* shared strings:                        Incompatibilities.
* shared variable attribute:             Variable Attributes.
* side effect in ?::                     Conditionals.
* side effects, macro argument:          Statement Exprs.
* side effects, order of evaluation:     Non-bugs.
* signal handler functions on the AVR processors: Function Attributes.
* signed and unsigned values, comparison warning: Warning Options.
* simple constraints:                    Simple Constraints.
* sin:                                   Other Builtins.
* sinf:                                  Other Builtins.
* sinl:                                  Other Builtins.
* sizeof:                                Typeof.
* smaller data references:               M32R/D Options.
* smaller data references (88k):         M88K Options.
* smaller data references (MIPS):        MIPS Options.
* smaller data references (PowerPC):     RS/6000 and PowerPC Options.
* snprintf:                              Other Builtins.
* SPARC options:                         SPARC Options.
* Spec Files:                            Spec Files.
* specified registers:                   Explicit Reg Vars.
* specifying compiler version and target machine: Target Options.
* specifying hardware config:            Submodel Options.
* specifying machine version:            Target Options.
* specifying registers for local variables: Local Reg Vars.
* sprintf:                               Other Builtins.
* sqrt:                                  Other Builtins.
* sqrtf:                                 Other Builtins.
* sqrtl:                                 Other Builtins.
* sscanf:                                Other Builtins.
* sscanf, and constant strings:          Incompatibilities.
* statements inside expressions:         Statement Exprs.
* static data in C++, declaring and defining: Static Definitions.
* stdarg.h and RT PC:                    RT Options.
* strcat:                                Other Builtins.
* strchr:                                Other Builtins.
* strcmp:                                Other Builtins.
* strcpy:                                Other Builtins.
* strcspn:                               Other Builtins.
* string constants:                      Incompatibilities.
* strlen:                                Other Builtins.
* strncat:                               Other Builtins.
* strncmp:                               Other Builtins.
* strncpy:                               Other Builtins.
* strpbrk:                               Other Builtins.
* strrchr:                               Other Builtins.
* strspn:                                Other Builtins.
* strstr:                                Other Builtins.
* struct:                                Unnamed Fields.
* structure passing (88k):               M88K Options.
* structures:                            Incompatibilities.
* structures, constructor expression:    Compound Literals.
* submodel options:                      Submodel Options.
* subscripting:                          Subscripting.
* subscripting and function values:      Subscripting.
* suffixes for C++ source:               Invoking G++.
* SUNPRO_DEPENDENCIES:                   Environment Variables.
* suppressing warnings:                  Warning Options.
* surprises in C++:                      C++ Misunderstandings.
* SVr4:                                  M88K Options.
* syntax checking:                       Warning Options.
* synthesized methods, warning:          C++ Dialect Options.
* system headers, warnings from:         Warning Options.
* target machine, specifying:            Target Options.
* target options:                        Target Options.
* TC1:                                   Standards.
* TC2:                                   Standards.
* Technical Corrigenda:                  Standards.
* Technical Corrigendum 1:               Standards.
* Technical Corrigendum 2:               Standards.
* template instantiation:                Template Instantiation.
* temporaries, lifetime of:              Temporaries.
* Thread-Local Storage:                  Thread-Local.
* thunks:                                Nested Functions.
* tiny data section on the H8/300H:      Function Attributes.
* TLS:                                   Thread-Local.
* tls_model attribute:                   Variable Attributes.
* TMPDIR:                                Environment Variables.
* TMS320C3x/C4x Options:                 TMS320C3x/C4x Options.
* traditional C language:                C Dialect Options.
* treelang <1>:                          Standards.
* treelang:                              G++ and GCC.
* type alignment:                        Alignment.
* type attributes:                       Type Attributes.
* type_info:                             Vague Linkage.
* typedef names as function parameters:  Incompatibilities.
* typeof:                                Typeof.
* ULL integer suffix:                    Long Long.
* Ultrix calling convention:             Interoperation.
* undefined behavior:                    Bug Criteria.
* undefined function value:              Bug Criteria.
* underscores in variables in macros:    Typeof.
* underscores, avoiding (88k):           M88K Options.
* union:                                 Unnamed Fields.
* union, casting to a:                   Cast to Union.
* unions:                                Incompatibilities.
* unknown pragmas, warning:              Warning Options.
* unresolved references and -nodefaultlibs: Link Options.
* unresolved references and -nostdlib:   Link Options.
* unused attribute.:                     Function Attributes.
* used attribute.:                       Function Attributes.
* V in constraint:                       Simple Constraints.
* V850 Options:                          V850 Options.
* vague linkage:                         Vague Linkage.
* value after longjmp:                   Global Reg Vars.
* variable addressability on the M32R/D: Variable Attributes.
* variable alignment:                    Alignment.
* variable attributes:                   Variable Attributes.
* variable number of arguments:          Variadic Macros.
* variable-length array scope:           Variable Length.
* variable-length arrays:                Variable Length.
* variables in specified registers:      Explicit Reg Vars.
* variables, local, in macros:           Typeof.
* variadic macros:                       Variadic Macros.
* VAX calling convention:                Interoperation.
* VAX options:                           VAX Options.
* visibility attribute:                  Function Attributes.
* VLAs:                                  Variable Length.
* void pointers, arithmetic:             Pointer Arith.
* void, size of pointer to:              Pointer Arith.
* volatile access:                       Volatiles.
* volatile applied to function:          Function Attributes.
* volatile read:                         Volatiles.
* volatile write:                        Volatiles.
* vprintf:                               Other Builtins.
* vscanf:                                Other Builtins.
* vsnprintf:                             Other Builtins.
* vsprintf:                              Other Builtins.
* vsscanf:                               Other Builtins.
* vtable:                                Vague Linkage.
* warning for comparison of signed and unsigned values: Warning Options.
* warning for overloaded virtual fn:     C++ Dialect Options.
* warning for reordering of member initializers: C++ Dialect Options.
* warning for synthesized methods:       C++ Dialect Options.
* warning for unknown pragmas:           Warning Options.
* warning messages:                      Warning Options.
* warnings from system headers:          Warning Options.
* warnings vs errors:                    Warnings and Errors.
* weak attribute:                        Function Attributes.
* whitespace:                            Incompatibilities.
* X in constraint:                       Simple Constraints.
* X3.159-1989:                           Standards.
* x86-64 Options:                        i386 and x86-64 Options.
* Xstormy16 Options:                     Xstormy16 Options.
* Xtensa Options:                        Xtensa Options.
* zero division on 88k:                  M88K Options.
* zero-length arrays:                    Zero Length.
* zero-size structures:                  Empty Structures.


