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Oracle Solaris Studio 12.2: C User's Guide
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1.  Introduction to the C Compiler

2.  C-Compiler Implementation-Specific Information

3.  Parallelizing C Code

4.  lint Source Code Checker

5.  Type-Based Alias Analysis

6.  Transitioning to ISO C

6.1 Basic Modes

6.1.1 -Xc

6.1.2 -Xa

6.1.3 -Xt

6.1.4 -Xs

6.2 A Mixture of Old- and New-Style Functions

6.2.1 Writing New Code

6.2.2 Updating Existing Code

6.2.3 Mixing Considerations

6.3 Functions With Varying Arguments

6.4 Promotions: Unsigned Versus Value Preserving

6.4.1 Background

6.4.2 Compilation Behavior

6.4.3 First Example: The Use of a Cast

6.4.4 Bit-fields

6.4.5 Second Example: Same Result

6.4.6 Integral Constants

6.4.7 Third Example: Integral Constants

6.5 Tokenization and Preprocessing

6.5.1 ISO C Translation Phases

6.5.2 Old C Translation Phases

6.5.3 Logical Source Lines

6.5.4 Macro Replacement

6.5.5 Using Strings

6.5.6 Token Pasting

6.6 const and volatile

6.6.1 Types, Only for lvalue

6.6.2 Type Qualifiers in Derived Types

6.6.3 const Means readonly

6.6.4 Examples of const Usage

6.6.5 volatile Means Exact Semantics

6.6.6 Examples of volatile Usage

6.7 Multibyte Characters and Wide Characters

6.7.1 Asian Languages Require Multibyte Characters

6.7.2 Encoding Variations

6.7.3 Wide Characters

6.7.4 Conversion Functions

6.7.5 C Language Features

6.8 Standard Headers and Reserved Names

6.8.1 Standard Headers

6.8.2 Names Reserved for Implementation Use

6.8.3 Names Reserved for Expansion

6.8.4 Names Safe to Use

6.9 Internationalization

6.9.1 Locales

6.9.2 The setlocale() Function

6.9.3 Changed Functions

6.9.4 New Functions

6.10 Grouping and Evaluation in Expressions

6.10.1 Definitions

6.10.2 The K&R C Rearrangement License

6.10.3 The ISO C Rules

6.10.4 The Parentheses

6.10.5 The As If Rule

6.11 Incomplete Types

6.11.1 Types

6.11.2 Completing Incomplete Types

6.11.3 Declarations

6.11.4 Expressions

6.11.5 Justification

6.11.6 Examples

6.12 Compatible and Composite Types

6.12.1 Multiple Declarations

6.12.2 Separate Compilation Compatibility

6.12.3 Single Compilation Compatibility

6.12.4 Compatible Pointer Types

6.12.5 Compatible Array Types

6.12.6 Compatible Function Types

6.12.7 Special Cases

6.12.8 Composite Types

7.  Converting Applications for a 64-Bit Environment

8.  cscope: Interactively Examining a C Program

A.  Compiler Options Grouped by Functionality

B.  C Compiler Options Reference

C.  Implementation-Defined ISO/IEC C99 Behavior

D.  Supported Features of C99

E.  Implementation-Defined ISO/IEC C90 Behavior

F.  ISO C Data Representations

G.  Performance Tuning

H.  The Differences Between K&R Solaris Studio C and Solaris Studio ISO C


6.1 Basic Modes

The ISO C compiler allows both old-style and new-style C code. The compiler provides varying degrees of compliance to the ISO C standard when you use the following -X (note case) options with -xc99=none. -Xa is the default mode. Note that the compiler’s default mode is -xc99=all, so its behavior under each of the -X options depends on the setting of -xc99.

6.1.1 -Xc

(c = conformance) Maximally conformant ISO C, without K&R C compatibility extensions. The compiler issues errors and warnings for programs that use ISO C constructs.

6.1.2 -Xa

ISO C plus K&R C compatibility extensions, with semantic changes required by ISO C. Where K&R C and ISO C specify different semantics for the same construct, the compiler issues warnings about the conflict and uses the ISO C interpretation. This is the default mode.

6.1.3 -Xt

(t = transition) ISO C plus K&R C compatibility extensions, without semantic changes required by ISO C. Where K&R C and ISO C specify different semantics for the same construct, the compiler issues warnings about the conflict and uses the K&R C interpretation.

6.1.4 -Xs

(s = K&R C) The compiled language includes all features compatible with ISO K&R C. The compiler warns about all language constructs that have differing behavior between ISO C and K&R C.