Roland Ver. 4.5 Informações Técnicas Página 55
- Página / 212
- Índice
- MARCADORES
Avaliado. / 5. Com base em avaliações de clientes
Chapter 5: Writing Recipes in Rules 45
.ONESHELL:
SHELL = /usr/bin/perl
.SHELLFLAGS = -e
show :
@f = qw(a b c);
print "@f\n";
However, either of these alternatives would work properly:
.ONESHELL:
SHELL = /usr/bin/perl
.SHELLFLAGS = -e
show :
# Make sure "@" is not the first character on the first line
@f = qw(a b c);
print "@f\n";
or
.ONESHELL:
SHELL = /usr/bin/perl
.SHELLFLAGS = -e
show :
my @f = qw(a b c);
print "@f\n";
As a special feature, if SHELL is determined to be a POSIX-style shell, the special prefix
characters in “internal” recipe lines will removed before the recipe is processed. This feature
is intended to allow existing makefiles to add the .ONESHELL special target and still run
properly without extensive modifications. Since the special prefix characters are not legal
at the beginning of a line in a POSIX shell script this is not a loss in functionality. For
example, this works as expected:
.ONESHELL:
foo : bar/lose
@cd $(@D)
@gobble $(@F) > ../$@
Even with this special feature, however, makefiles with .ONESHELL will behave differently
in ways that could be noticeable. For example, normally if any line in the recipe fails, that
causes the rule to fail and no more recipe lines are processed. Under .ONESHELL a failure
of any but the final recipe line will not be noticed by make. You can modify .SHELLFLAGS
to add the -e option to the shell which will cause any failure anywhere in the command
line to cause the shell to fail, but this could itself cause your recipe to behave differently.
Ultimately you may need to harden your recipe lines to allow them to work with .ONESHELL.
5.3.2 Choosing the Shell
The program used as the shell is taken from the variable SHELL. If this variable is not set
in your makefile, the program /bin/sh is used as the shell. The argument(s) passed to the
shell are taken from the variable .SHELLFLAGS. The default value of .SHELLFLAGS is -c
normally, or -ec in POSIX-conforming mode.
- GNU Make 1
- Short Contents 5
- Table of Contents 7
- 1 Overview of make 11
- 2 An Introduction to Makefiles 13
- 2.2 A Simple Makefile 14
- 2.6 Another Style of Makefile 18
- 3 Writing Makefiles 21
- 3.1.1 Splitting Long Lines 22
- 3.3 Including Other Makefiles 23
- 3.4 The Variable MAKEFILES 24
- 3.5 How Makefiles Are Remade 24
- 3.7 How make Reads a Makefile 26
- Conditional Directives 27
- Rule Definition 27
- 3.8 Secondary Expansion 28
- 4 Writing Rules 31
- 4.2 Types of Prerequisites 32
- 4.3.1 Wildcard Examples 33
- 4.3.3 The Function wildcard 34
- 4.4.2 The vpath Directive 36
- 4.5 Phony Targets 39
- 4.11 Static Pattern Rules 46
- 4.12 Double-Colon Rules 48
- %.d: %.c 49
- @set -e; rm -f $@; \ 49
- 5 Writing Recipes in Rules 51
- 5.2 Recipe Echoing 53
- 5.3 Recipe Execution 54
- 5.3.2 Choosing the Shell 55
- 5.4 Parallel Execution 57
- 5.5 Errors in Recipes 59
- 5.7 Recursive Use of make 60
- 5.8 Defining Canned Recipes 66
- 5.9 Using Empty Recipes 67
- 6 How to Use Variables 69
- 6.3.1 Substitution References 72
- 6.3.2 Computed Variable Names 73
- 6.5 Setting Variables 75
- 6.7 The override Directive 78
- 6.9 Undefining Variables 79
- 6.13 Suppressing Inheritance 82
- 6.14 Other Special Variables 83
- 7.1 Example of a Conditional 87
- 7.2 Syntax of Conditionals 88
- 8.1 Function Call Syntax 93
- 8.3 Functions for File Names 97
- 8.5 The foreach Function 100
- 8.6 The file Function 101
- 8.7 The call Function 102
- 8.8 The value Function 103
- 8.9 The eval Function 103
- 8.10 The origin Function 104
- 8.11 The flavor Function 105
- 8.14 The guile Function 107
- 8.13 The shell Function 107
- 9 How to Run make 109
- 9.5 Overriding Variables 113
- 9.7 Summary of Options 114
- 10 Using Implicit Rules 121
- 10.4 Chains of Implicit Rules 127
- 10.5.2 Pattern Rule Examples 129
- 10.5.3 Automatic Variables 130
- 10.5.4 How Patterns Match 132
- 10.7 Old-Fashioned Suffix Rules 135
- 12 Extending GNU make 143
- 12.2 Loading Dynamic Objects 145
- 12.2.1 The load Directive 146
- Loaded Object Licensing 147
- Data Structures 148
- Registering Functions 148
- Registered Function Interface 148
- GNU make Facilities 148
- Memory Management 149
- 12.2.4 Example Loaded Object 149
- 13 Features of GNU make 153
- 15 Makefile Conventions 159
- 15.2 Utilities in Makefiles 160
- CFLAGS = -g 161
- ALL_CFLAGS = -I. $(CFLAGS) 161
- Appendix A Quick Reference 175
- Index of Concepts 201
- 192 GNU make 202
- Index of Concepts 193 203
- 194 GNU make 204
- Index of Concepts 195 205
- 196 GNU make 206
- Index of Concepts 197 207
- 198 GNU make 208
- 200 GNU make 210
Manuais e produtos relacionados com Digitalizar e Imprimir Roland Ver. 4.5
(26 páginas)
Digitalizar e Imprimir Roland PC-12 Especificações
(97 páginas)
(97 páginas)
© 2020, manymanuals-pt.com. Todos os direitos reservados. | 0.048 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentários a estes Manuais