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* NEWS: Update. * am/bootstrap.am (SOURCES): * module/Makefile.am (SOURCES): Add system/foreign-library.scm. * configure.ac: Replace ltdl check with -ldl check. * libguile/dynl.c: Rewrite to just expose core dlopen / dlsym / etc to a helper Scheme module. (scm_dynamic_link, scm_dynamic_pointer, scm_dynamic_function) (scm_dynamic_object_p, scm_dynamic_call): Rewrite in terms of (system foreign-library). * libguile/extensions.c (load_extension): Avoid scm_dynamic_call. * module/system/foreign-library.scm: New file. * module/oop/goops.scm (<dynamic-object>): Hackily export <foreign-library> instead of a class here. * doc/ref/api-foreign.texi (Foreign Function Interface): Rewrite to only document the new interfaces. Eventually we will deprecate dynamic-link and friends. * doc/ref/guile.texi (API Reference): Move Foreign Objects after Foreign Function Interface. Seems there should be some closer relationship but this will do for now. * doc/ref/tour.texi (Putting Extensions into Modules): * doc/ref/libguile-parallel.texi (Parallel Installations): Update for rename of Modules and Extensions to Foreign Extensions. * libguile/deprecated.h: * libguile/deprecated.c (scm_dynamic_unlink): Deprecate. * libguile/guile.c: Remove ltdl include. * test-suite/tests/foreign.test: Update tests to use new API, and update error expectations.
84 lines
3.4 KiB
Text
84 lines
3.4 KiB
Text
@c -*-texinfo-*-
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@c This is part of the GNU Guile Reference Manual.
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@c Copyright (C) 1996, 1997, 2000, 2001, 2002, 2003, 2004, 2005, 2010, 2011,
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@c 2013-2014, 2021 Free Software Foundation, Inc.
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@c See the file guile.texi for copying conditions.
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@node Parallel Installations
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@section Parallel Installations
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@cindex pkg-config
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@cindex effective version
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Guile provides strong API and ABI stability guarantees during stable
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series, so that if a user writes a program against Guile version 2.2.3,
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it will be compatible with some future version 2.2.7. We say in this
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case that 2.2 is the @dfn{effective version}, composed of the major and
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minor versions, in this case 2 and 2.
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Users may install multiple effective versions of Guile, with each
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version's headers, libraries, and Scheme files under their own
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directories. This provides the necessary stability guarantee for users,
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while also allowing Guile developers to evolve the language and its
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implementation.
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However, parallel installability does have a down-side, in that users
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need to know which version of Guile to ask for, when they build against
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Guile. Guile solves this problem by installing a file to be read by the
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@code{pkg-config} utility, a tool to query installed packages by name.
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Guile encodes the version into its pkg-config name, so that users can
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ask for @code{guile-2.2} or @code{guile-3.0}, as appropriate.
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For effective version @value{EFFECTIVE-VERSION}, for example, you would
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invoke @code{pkg-config --cflags --libs guile-@value{EFFECTIVE-VERSION}}
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to get the compilation and linking flags necessary to link to version
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@value{EFFECTIVE-VERSION} of Guile. You would typically run
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@code{pkg-config} during the configuration phase of your program and use
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the obtained information in the Makefile.
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Guile's @code{pkg-config} file,
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@file{guile-@value{EFFECTIVE-VERSION}.pc}, defines additional useful
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variables:
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@table @code
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@item sitedir
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@cindex @code{sitedir}
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The default directory where Guile looks for Scheme source and compiled
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files (@pxref{Installing Site Packages, %site-dir}). Run
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@command{pkg-config guile-@value{EFFECTIVE-VERSION} --variable=sitedir}
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to see its value. @xref{Autoconf Macros, GUILE_SITE_DIR}, for more on
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how to use it from Autoconf.
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@item extensiondir
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@cindex @code{extensiondir}
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The default directory where Guile looks for extensions---i.e., shared
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libraries providing additional features (@pxref{Foreign Extensions}).
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Run @command{pkg-config guile-@value{EFFECTIVE-VERSION}
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--variable=extensiondir} to see its value.
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@item guile
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@itemx guild
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@cindex program name transformations, dealing with
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The absolute file name of the @command{guile} and @command{guild}
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commands@footnote{The @code{guile} and @code{guild} variables defined
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starting from Guile version 2.0.12.}. Run @command{pkg-config
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guile-@value{EFFECTIVE-VERSION} --variable=guile} or
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@code{--variable=guild} to see their value.
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These variables allow users to deal with program name transformations
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that may be specified when configuring Guile with
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@code{--program-transform-name}, @code{--program-suffix}, or
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@code{--program-prefix} (@pxref{Transformation Options,,, autoconf, GNU
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Autoconf Manual}).
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@end table
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@noindent
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See the @code{pkg-config} man page, for more information, or its web
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site, @url{http://pkg-config.freedesktop.org/}.
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@xref{Autoconf Support}, for more on checking for Guile from within a
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@code{configure.ac} file.
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@c Local Variables:
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@c TeX-master: "guile.texi"
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@c End:
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