|
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fc043f |
\input texinfo @c -*- Texinfo -*-
|
|
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fc043f |
@c %**start of header
|
|
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fc043f |
@setfilename gpgrt.info
|
|
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fc043f |
@include version.texi
|
|
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fc043f |
@settitle The Libgpg-error Reference Manual
|
|
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fc043f |
@c Unify some of the indices.
|
|
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fc043f |
@syncodeindex tp fn
|
|
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@syncodeindex pg fn
|
|
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fc043f |
@c %**end of header
|
|
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fc043f |
@copying
|
|
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fc043f |
This manual is for Libgpg-error (version @value{VERSION},
|
|
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fc043f |
@value{UPDATED}), which is a library for code used by all GnuPG
|
|
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related packages.
|
|
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|
|
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@noindent
|
|
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Copyright @copyright{} 2014 g10 Code GmbH
|
|
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|
|
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fc043f |
@quotation
|
|
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fc043f |
Permission is granted to copy, distribute and/or modify this document
|
|
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fc043f |
under the terms of the GNU General Public License as published by the
|
|
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fc043f |
Free Software Foundation; either version 2 of the License, or (at your
|
|
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fc043f |
option) any later version. The text of the license can be found in the
|
|
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fc043f |
section entitled ``GNU General Public License''.
|
|
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fc043f |
@end quotation
|
|
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fc043f |
@end copying
|
|
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fc043f |
|
|
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fc043f |
@dircategory Libraries
|
|
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fc043f |
@direntry
|
|
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fc043f |
* libgpg-error: (gnupg). Error codes and common code for GnuPG.
|
|
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fc043f |
@end direntry
|
|
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fc043f |
|
|
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fc043f |
@c A couple of macros with no effect on texinfo
|
|
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fc043f |
@c but used by the yat2m processor.
|
|
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@macro manpage {a}
|
|
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@end macro
|
|
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@macro mansect {a}
|
|
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fc043f |
@end macro
|
|
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@macro manpause
|
|
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@end macro
|
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@macro mancont
|
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@end macro
|
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|
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@c
|
|
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fc043f |
@c Printing stuff taken from gcc.
|
|
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@c
|
|
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@macro gnupgtabopt{body}
|
|
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@code{\body\}
|
|
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@end macro
|
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|
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fc043f |
@c
|
|
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fc043f |
@c Titlepage
|
|
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fc043f |
@c
|
|
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fc043f |
@setchapternewpage odd
|
|
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fc043f |
@titlepage
|
|
Packit |
fc043f |
@title The Libgpg-error Reference Manual
|
|
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fc043f |
@subtitle Version @value{VERSION}
|
|
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fc043f |
@subtitle @value{UPDATED}
|
|
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fc043f |
@author Werner Koch (@email{wk@@gnupg.org})
|
|
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fc043f |
|
|
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fc043f |
@page
|
|
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fc043f |
@vskip 0pt plus 1filll
|
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@insertcopying
|
|
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@end titlepage
|
|
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fc043f |
|
|
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fc043f |
@ifnothtml
|
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fc043f |
@summarycontents
|
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fc043f |
@contents
|
|
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fc043f |
@page
|
|
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fc043f |
@end ifnothtml
|
|
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fc043f |
|
|
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fc043f |
|
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@ifnottex
|
|
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@node Top
|
|
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fc043f |
@top The Libgpg-error Library
|
|
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fc043f |
@insertcopying
|
|
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fc043f |
@end ifnottex
|
|
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fc043f |
|
|
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fc043f |
|
|
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fc043f |
@menu
|
|
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fc043f |
* Introduction:: What is Libgpg-error.
|
|
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fc043f |
* Preparation:: What you should do before using the library.
|
|
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fc043f |
* Generalities:: General library functions and data types.
|
|
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fc043f |
* Tools:: Utility tools
|
|
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fc043f |
|
|
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fc043f |
Appendices
|
|
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fc043f |
|
|
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fc043f |
* Library Copying:: The GNU Lesser General Public License
|
|
Packit |
fc043f |
says how you can copy and share Libgpg-error.
|
|
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fc043f |
* Copying:: The GNU General Public License says how you
|
|
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fc043f |
can copy and share some parts of Libgpg-error.
|
|
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fc043f |
|
|
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fc043f |
Indices
|
|
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fc043f |
|
|
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@c * Figures and Tables:: Index of figures and tables.
|
|
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fc043f |
* Concept Index:: Index of concepts and programs.
|
|
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fc043f |
* Function and Data Index:: Index of functions, variables and data types.
|
|
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fc043f |
|
|
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fc043f |
@end menu
|
|
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fc043f |
|
|
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fc043f |
@ifhtml
|
|
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fc043f |
@page
|
|
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fc043f |
@summarycontents
|
|
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fc043f |
@contents
|
|
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fc043f |
@end ifhtml
|
|
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fc043f |
|
|
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|
|
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@c **********************************************************
|
|
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fc043f |
@c ******************* Introduction ***********************
|
|
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fc043f |
@c **********************************************************
|
|
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fc043f |
@node Introduction
|
|
Packit |
fc043f |
@chapter Introduction
|
|
Packit |
fc043f |
|
|
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fc043f |
Libgpg-error is a library to provide error codes for GnuPG and relates
|
|
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fc043f |
software as well as some other general purpose functions. It is
|
|
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fc043f |
planned to eventually rename this library to ``gpgrt'' (for GnuPG
|
|
Packit |
fc043f |
RunTime).
|
|
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fc043f |
|
|
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fc043f |
@menu
|
|
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fc043f |
* Getting Started:: How to use this manual.
|
|
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fc043f |
* Features:: A glance at Libgpg-error’s features.
|
|
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fc043f |
* Overview:: Overview about the library.
|
|
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fc043f |
@end menu
|
|
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fc043f |
|
|
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fc043f |
@node Getting Started
|
|
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fc043f |
@section Getting Started
|
|
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fc043f |
|
|
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fc043f |
This manual documents the Libgpg-error library application programming
|
|
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fc043f |
interface (API). The goal is to that all functions and data types
|
|
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fc043f |
provided by the library are explained. However, for now this is only
|
|
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fc043f |
a stub and not very useful.
|
|
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fc043f |
|
|
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fc043f |
|
|
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fc043f |
@node Features
|
|
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fc043f |
@section Features
|
|
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fc043f |
|
|
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fc043f |
TBD
|
|
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fc043f |
|
|
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fc043f |
@node Overview
|
|
Packit |
fc043f |
@section Overview
|
|
Packit |
fc043f |
|
|
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fc043f |
@noindent
|
|
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fc043f |
The Libgpg-error library is fully thread-safe, where it makes
|
|
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fc043f |
sense to be thread-safe.
|
|
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fc043f |
|
|
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fc043f |
TBD
|
|
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fc043f |
|
|
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fc043f |
@c **********************************************************
|
|
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fc043f |
@c ******************* Preparation ************************
|
|
Packit |
fc043f |
@c **********************************************************
|
|
Packit |
fc043f |
@node Preparation
|
|
Packit |
fc043f |
@chapter Preparation
|
|
Packit |
fc043f |
|
|
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fc043f |
To use Libgpg-error, you have to perform some changes to your
|
|
Packit |
fc043f |
sources and the build system. The necessary changes are small and
|
|
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fc043f |
explained in the following sections. At the end of this chapter, it
|
|
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fc043f |
is described how the library is initialized, and how the requirements
|
|
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fc043f |
of the library are verified.
|
|
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fc043f |
|
|
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fc043f |
@menu
|
|
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fc043f |
* Header:: What header file you need to include.
|
|
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fc043f |
* Building sources:: How to build sources using the library.
|
|
Packit |
fc043f |
* Building sources using Automake:: How to build sources with the help of Automake.
|
|
Packit |
fc043f |
* Initializing the library:: How to initialize the library.
|
|
Packit |
fc043f |
* Multi-Threading:: How Libgpg-error can be used in a MT environment.
|
|
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fc043f |
@end menu
|
|
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fc043f |
|
|
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fc043f |
|
|
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fc043f |
@node Header
|
|
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fc043f |
@section Header
|
|
Packit |
fc043f |
|
|
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fc043f |
All interfaces (data types and functions) of the library are defined
|
|
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fc043f |
in the header file @file{libgpg-error.h}. You must include this in all source
|
|
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fc043f |
files using the library, either directly or through some other header
|
|
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fc043f |
file, like this:
|
|
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fc043f |
|
|
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fc043f |
@example
|
|
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fc043f |
#include <libgpg-error.h>
|
|
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fc043f |
@end example
|
|
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fc043f |
|
|
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fc043f |
Note well that the header file is platform specific and may only be
|
|
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fc043f |
used on the platform for which it has been build.
|
|
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fc043f |
|
|
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fc043f |
The name space of Libgpg-error is @code{gpg_*} and @code{gpgrt*}
|
|
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fc043f |
for function and type names and @code{GPG_*} and @code{GPGRT_*}
|
|
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fc043f |
for other symbols. In addition the same name prefixes with one
|
|
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fc043f |
prepended underscore are reserved for internal use and should never be
|
|
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fc043f |
used by an application.
|
|
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fc043f |
|
|
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fc043f |
@noindent
|
|
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fc043f |
Certain parts of gpg-error.h may be included by defining these macros:
|
|
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fc043f |
|
|
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fc043f |
@table @code
|
|
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fc043f |
@item GPG_ERR_ENABLE_GETTEXT_MACROS
|
|
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fc043f |
Define to provide macros to map the internal gettext API to standard
|
|
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fc043f |
names. This has only an effect on Windows platforms.
|
|
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fc043f |
|
|
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fc043f |
@item GPGRT_ENABLE_ES_MACROS
|
|
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Define to provide "es_" macros for the estream functions.
|
|
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fc043f |
@end table
|
|
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|
|
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fc043f |
@node Building sources
|
|
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fc043f |
@section Building sources
|
|
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fc043f |
|
|
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fc043f |
If you want to compile a source file including the `gpg-error.h' header
|
|
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fc043f |
file, you must make sure that the compiler can find it in the
|
|
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fc043f |
directory hierarchy. This is accomplished by adding the path to the
|
|
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fc043f |
directory in which the header file is located to the compilers include
|
|
Packit |
fc043f |
file search path (via the @option{-I} option).
|
|
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fc043f |
|
|
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fc043f |
However, the path to the include file is determined at the time the
|
|
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fc043f |
source is configured. To solve this problem, Libgpg-error ships with
|
|
Packit |
fc043f |
the small helper programs @command{gpg-error-config} and
|
|
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fc043f |
@command{gpgrt-config} which both know the path to the include file
|
|
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fc043f |
and other configuration options. The options that need to be added to
|
|
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fc043f |
the compiler invocation at compile time are output by the
|
|
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fc043f |
@option{--cflags} option to @command{gpg-error-config} (or
|
|
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fc043f |
@command{gpgrt-config}. The following example shows how it can be
|
|
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fc043f |
used at the command line:
|
|
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fc043f |
|
|
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fc043f |
@example
|
|
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fc043f |
gcc -c foo.c $(gpg-error-config --cflags)
|
|
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fc043f |
@end example
|
|
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fc043f |
|
|
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fc043f |
or with the identical
|
|
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fc043f |
|
|
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fc043f |
@example
|
|
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fc043f |
gcc -c foo.c $(gpgrt-config --cflags)
|
|
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fc043f |
@end example
|
|
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fc043f |
|
|
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fc043f |
Adding the output of @samp{gpg-error-config --cflags} to the
|
|
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fc043f |
compiler’s command line will ensure that the compiler can find the
|
|
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fc043f |
Libgpg-error header file.
|
|
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fc043f |
|
|
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fc043f |
A similar problem occurs when linking the program with the library.
|
|
Packit |
fc043f |
Again, the compiler has to find the library files. For this to work,
|
|
Packit |
fc043f |
the path to the library files has to be added to the library search
|
|
Packit |
fc043f |
path (via the @option{-L} option). For this, the option
|
|
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fc043f |
@option{--libs} to @command{gpg-error-config} can be used. The
|
|
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fc043f |
example shows how to link @file{foo.o} with the Libgpg-error library
|
|
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fc043f |
to a program @command{foo}.
|
|
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fc043f |
|
|
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fc043f |
@example
|
|
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fc043f |
gcc -o foo foo.o $(gpg-error-config --libs)
|
|
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fc043f |
@end example
|
|
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fc043f |
|
|
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fc043f |
Of course you can also combine both examples to a single command by
|
|
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fc043f |
specifying both options to @command{gpg-error-config}:
|
|
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fc043f |
|
|
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fc043f |
@example
|
|
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fc043f |
gcc -o foo foo.c $(gpg-error-config --cflags --libs)
|
|
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fc043f |
@end example
|
|
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fc043f |
|
|
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fc043f |
@node Building sources using Automake
|
|
Packit |
fc043f |
@section Building sources using Automake
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
It is much easier if you use GNU Automake instead of writing your own
|
|
Packit |
fc043f |
Makefiles. If you do that, you do not have to worry about finding and
|
|
Packit |
fc043f |
invoking the @command{gpg-error-config} script at all. Libgpg-error
|
|
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fc043f |
provides an extension to Automake that does all the work for you.
|
|
Packit |
fc043f |
|
|
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fc043f |
@c A simple macro for optional variables.
|
|
Packit |
fc043f |
@macro ovar{varname}
|
|
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fc043f |
@r{[}@var{\varname\}@r{]}
|
|
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fc043f |
@end macro
|
|
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fc043f |
@defmac AM_PATH_GPG_ERROR (@ovar{minimum-version}, @ovar{action-if-found}, @ovar{action-if-not-found})
|
|
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fc043f |
Check whether Libgpg-error (at least version @var{minimum-version}, if
|
|
Packit |
fc043f |
given) exists on the host system. If it is found, execute
|
|
Packit |
fc043f |
@var{action-if-found}, otherwise do @var{action-if-not-found}, if
|
|
Packit |
fc043f |
given.
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
Additionally, the function defines @code{GPG_ERROR_CFLAGS} to the
|
|
Packit |
fc043f |
flags needed for compilation of the program to find the
|
|
Packit |
fc043f |
@file{gpg-error.h} header file, and @code{GPG_ERROR_LIBS} to the
|
|
Packit |
fc043f |
linker flags needed to link the program to the Libgpg-error library. If
|
|
Packit |
fc043f |
the used helper script does not match the target type you are building
|
|
Packit |
fc043f |
for a warning is printed and the string @code{libgpg-error} is
|
|
Packit |
fc043f |
appended to the variable @code{gpg_config_script_warn}.
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
This macro searches for @command{gpg-error-config} along the PATH. If
|
|
Packit |
fc043f |
you are cross-compiling, it is useful to set the environment variable
|
|
Packit |
fc043f |
@code{SYSROOT} to the top directory of your target. The macro will
|
|
Packit |
fc043f |
then first look for the helper program in the @file{bin} directory
|
|
Packit |
fc043f |
below that top directory. An absolute directory name must be used for
|
|
Packit |
fc043f |
@code{SYSROOT}. Finally, if the configure command line option
|
|
Packit |
fc043f |
@code{--with-libgpg-error-prefix} is used, only its value is used for
|
|
Packit |
fc043f |
the top directory below which the helper script is expected.
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
@end defmac
|
|
Packit |
fc043f |
|
|
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fc043f |
You can use the defined Autoconf variables like this in your
|
|
Packit |
fc043f |
@file{Makefile.am}:
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
@example
|
|
Packit |
fc043f |
AM_CPPFLAGS = $(GPG_ERROR_CFLAGS)
|
|
Packit |
fc043f |
LDADD = $(GPG_ERROR_LIBS)
|
|
Packit |
fc043f |
@end example
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
@node Initializing the library
|
|
Packit |
fc043f |
@section Initializing the library
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
Before the library can be used, it should initialize itself. This is
|
|
Packit |
fc043f |
achieved by invoking the function @code{gpgrt_check_version} described
|
|
Packit |
fc043f |
below.
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
Also, it is often desirable to check that the version of
|
|
Packit |
fc043f |
Libgpg-error used is indeed one which fits all requirements.
|
|
Packit |
fc043f |
Even with binary compatibility, new features may have been introduced,
|
|
Packit |
fc043f |
but due to problem with the dynamic linker an old version may actually
|
|
Packit |
fc043f |
be used. So you may want to check that the version is okay right
|
|
Packit |
fc043f |
after program startup.
|
|
Packit |
fc043f |
|
|
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@deftypefun {const char *} gpgrt_check_version (const char *@var{req_version})
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The function @code{gpgrt_check_version} initializes some subsystems used
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by Libgpg-error and must be invoked before any other function in the
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library.
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@xref{Multi-Threading}.
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Furthermore, this function returns the version number of the library.
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It can also verify that the version number is higher than a certain
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required version number @var{req_version}, if this value is not a null
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pointer.
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@end deftypefun
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@node Multi-Threading
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@section Multi-Threading
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TBD.
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@c **********************************************************
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@c ******************* General ****************************
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@c **********************************************************
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@node Generalities
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@chapter Generalities
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TBD. (Description of the error function may be taken from Libgcrypt.)
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@c **********************************************************
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@c ********************* Tools ****************************
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@c **********************************************************
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@node Tools
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@chapter Tools
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@menu
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* gpg-error-config:: Print required compiler flags
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@end menu
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@c The original version of this man page has been written for Debian and was
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@c contributed to libgpg-error by Daniel Kahn Gillmor <dkg@fifthhorseman.net>.
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@manpage gpg-error-config.1
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@node gpg-error-config
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@section Print required compiler flags
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@ifset manverb
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.B gpg-error-config
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|
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\- Script to get information about the installed version of libgpg-error
|
|
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@end ifset
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@mansect synopsis
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@ifset manverb
|
|
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.B gpg-error-config
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|
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.RI [ options ]
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@end ifset
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@mansect description
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|
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@command{gpg-error-config} is a tool that is used to configure to
|
|
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determine the compiler and linker flags that should be used to compile
|
|
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and link programs that use Libgpg-error. It is also used
|
|
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internally to the @code{.m4} macros for GNU autoconf that are included
|
|
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with Libgpg-error.
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|
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|
|
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@mansect options
|
|
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@noindent
|
|
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@command{gpg-error-config} accepts the following options:
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|
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|
|
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@table @gnupgtabopt
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|
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|
|
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@item --mt
|
|
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Provide output appropriate for multithreaded programs. @option{--mt}
|
|
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is only useful when combined with other options, and must be the first
|
|
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option if present.
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|
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|
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@item --version
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|
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Print the currently installed version of Libgpg-error on the
|
|
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standard output.
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|
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|
|
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@item --libs
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|
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Print the linker flags that are necessary to link a program using
|
|
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Libgpg-error.
|
|
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|
|
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@item --cflags
|
|
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Print the compiler flags that are necessary to compile a program using
|
|
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Libgpg-error.
|
|
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|
|
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@item --prefix=@var{prefix}
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|
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If specified, use @var{prefix} instead of the installation prefix that
|
|
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Libgpg-error was built with when computing the output for the
|
|
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@option{--cflags} and @option{--libs} options. This option is also
|
|
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used for the exec prefix if @option{--exec-prefix} was not specified.
|
|
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This option must be specified before any @option{--libs} or
|
|
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@code{--cflags} options.
|
|
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|
|
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@item --exec-prefix=@var{prefix}
|
|
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If specified, use @var{prefix} instead of the installation exec prefix
|
|
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that Libgpg-error was built with when computing the output for the
|
|
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@option{--cflags} and @option{--libs} options. This option must be
|
|
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specified before any @option{--libs} or @option{--cflags} options.
|
|
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fc043f |
|
|
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fc043f |
@end table
|
|
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|
|
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@manpause
|
|
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|
|
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|
|
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|
|
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@c **********************************************************
|
|
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@c ************* Appendices (license etc.) ****************
|
|
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fc043f |
@c **********************************************************
|
|
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fc043f |
@include lgpl.texi
|
|
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|
|
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fc043f |
@include gpl.texi
|
|
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fc043f |
|
|
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fc043f |
@c @node Figures and Tables
|
|
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fc043f |
@c #@unnumbered List of Figures and Tables
|
|
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fc043f |
@c
|
|
Packit |
fc043f |
@c @listoffloats Figure
|
|
Packit |
fc043f |
@c
|
|
Packit |
fc043f |
@c @listoffloats Table
|
|
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fc043f |
|
|
Packit |
fc043f |
@node Concept Index
|
|
Packit |
fc043f |
@unnumbered Concept Index
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
@printindex cp
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
@node Function and Data Index
|
|
Packit |
fc043f |
@unnumbered Function and Data Index
|
|
Packit |
fc043f |
|
|
Packit |
fc043f |
@printindex fn
|
|
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fc043f |
|
|
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fc043f |
|
|
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fc043f |
@bye
|