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Programming Utilities Guide
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RecycleContents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
1. lex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Generating a Lexical Analyzer Program. . . . . . . . . . . . . . . . . . . 2
Writing lex Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
The Fundamentals of lex Rules . . . . . . . . . . . . . . . . . . . . . . . 4
Advancedlex Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
C++ Mangled Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Using lex and yacc Together 23
Automaton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Summary of Source Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2. yacc — A Compiler Compiler . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Basic Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Actions 37
iiiLexical Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Parser Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Ambiguity and Conflicts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Precedence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Error Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
The yacc Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Hints for Preparing Specifications . . . . . . . . . . . . . . . . . . . . . . . . 64
Input Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Left Recursion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
C++ Mangled Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Lexical Tie-Ins 66
Reserved Words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Advanced Topics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Simulating error and accept in Actions. . . . . . . . . . . . . . . . . 67
Accessing Values in Enclosing Rules. . . . . . . . . . . . . . . . . . . 68
Support for Arbitrary Value Types . . . . . . . . . . . . . . . . . . . . 69
yacc Input Syntax. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
A Simple Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
An Advanced Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
3. make Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Dependency Checking: make vs. Shell Scripts . . . . . . . . . 94
Writing a Simple Makefile . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
iv Programming Utilities Guide—August 1994Basic Use of Implicit Rules . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Processing Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Null Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Special Targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Unknown Targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Duplicate Targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Reserved make Words. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Running Commands Silently . . . . . . . . . . . . . . . . . . . . . . . . 105
Automatic Retrieval of SCCS Files . . . . . . . . . . . . . . . . . . . . 106
Passing Parameters: Simple make Macros . . . . . . . . . . . . . 107
.KEEP_STATE and Command Dependency Checking . . . 109ATE and Hidden Dependencies . . . . . . . . . . . . 110
Displaying Information About a make Run 112
Using make to Compile Programs. . . . . . . . . . . . . . . . . . . . . . . . 114
A Simple Makefile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Using Predefined Macros . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Using Implicit Rules to Simplify a Makefile: Suffix Rules . 117
When to Use Explicit Target Entries vs. Implicit Rules . . . 118
Implicit Rules and Dynamic Macros . . . . . . . . . . . . . . . . . . . 119
Adding Suffix Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Pattern-Matching Rules:An Alternative to Suffix Rules . . 124
Building Object Libraries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Libraries, Members, and Symbols . . . . . . . . . . . . . . . . . . . . . 131
Library Members and Dependency Checking . . . . . . . . . . . 132
Contents vUsing make to Maintain Libraries and Programs . . . . . . . . . . . 133
More about Macros . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Linking with System-Supplied Libraries . . . . . . . . . . . . . . . 136
Compiling Programs for Debugging and Profiling . . . . . . . 137
Compiling Debugging and Profiling Variants . . . . . . . . . . 139
Maintaining Separate Program and Library Variants . . . . . 140
Maintaining a Directory of Header Files . . . . . . . . . . . . . . . 145
Compiling and Linking with Your Own Libraries . . . . . . . 145
Nested make Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Passing Parameters to