Roland Ver. 4.5 Informações Técnicas Página 140
- Página / 212
- Índice
- MARCADORES
Avaliado. / 5. Com base em avaliações de clientes
130 GNU make
cc -c bar.c -o bar.o
ar r foo.a bar.o
rm -f bar.o
Here make has envisioned the file bar.o as an intermediate file. See Section 10.4 [Chains of
Implicit Rules], page 117.
Implicit rules such as this one are written using the automatic variable ‘$%’. See
Section 10.5.3 [Automatic Variables], page 120.
An archive member name in an archive cannot contain a directory name, but it may
be useful in a makefile to pretend that it does. If you write an archive member target
foo.a(dir/file.o), make will perform automatic updating with this recipe:
ar r foo.a dir/file.o
which has the effect of copying the file dir/file.o into a member named file.o. In
connection with such usage, the automatic variables %D and %F may be useful.
11.2.1 Updating Archive Symbol Directories
An archive file that is used as a library usually contains a special member named __.SYMDEF
that contains a directory of the external symbol names defined by all the other members.
After you update any other members, you need to update __.SYMDEF so that it will sum-
marize the other members properly. This is done by running the ranlib program:
ranlib archivefile
Normally you would put this command in the rule for the archive file, and make all the
members of the archive file prerequisites of that rule. For example,
libfoo.a: libfoo.a(x.o) libfoo.a(y.o) ...
ranlib libfoo.a
The effect of this is to update archive members x.o, y.o, etc., and then update the symbol
directory member __.SYMDEF by running ranlib. The rules for updating the members are
not shown here; most likely you can omit them and use the implicit rule which copies files
into the archive, as described in the preceding section.
This is not necessary when using the GNU ar program, which updates the __.SYMDEF
member automatically.
11.3 Dangers When Using Archives
It is important to be careful when using parallel execution (the -j switch; see Section 5.4
[Parallel Execution], page 47) and archives. If multiple ar commands run at the same time
on the same archive file, they will not know about each other and can corrupt the file.
Possibly a future version of make will provide a mechanism to circumvent this problem
by serializing all recipes that operate on the same archive file. But for the time being, you
must either write your makefiles to avoid this problem in some other way, or not use -j.
11.4 Suffix Rules for Archive Files
You can write a special kind of suffix rule for dealing with archive files. See Section 10.7
[Suffix Rules], page 125, for a full explanation of suffix rules. Archive suffix rules are
obsolete in GNU make, because pattern rules for archives are a more general mechanism
- 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. | 0.066 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentários a estes Manuais