Add `pkg-config' support.

.gitignore

@@ -69,3 +69,4 @@ guile-config/guile-config
 guile-readline/guile-readline-config.h
 guile-readline/guile-readline-config.h.in
 TAGS
+guile-1.8.pc

ChangeLog

@@ -1,3 +1,9 @@
+2008-05-04  Ludovic Courtès  <ludo@gnu.org>
+
+	* configure.in: Substitute `sitedir', produce `guile-1.8.pc'.
+	* Makefile.am (EXTRA_DIST): Add `guile-1.8.pc.in'.
+	(pkgconfigdir, pkgconfig_DATA): New.
+
 2008-04-26  Ludovic Courtès  <ludo@gnu.org>
 
 	* configure.in (BUILD_PTHREAD_SUPPORT): New Automake

Makefile.am

@@ -32,7 +32,7 @@ bin_SCRIPTS = guile-tools
 include_HEADERS = libguile.h
 
 EXTRA_DIST = LICENSE HACKING GUILE-VERSION \
-	     m4/ChangeLog FAQ
+	     m4/ChangeLog FAQ guile-1.8.pc.in
 
 TESTS = check-guile
 
@@ -40,4 +40,7 @@ ACLOCAL_AMFLAGS = -I guile-config -I m4
 
 DISTCLEANFILES = check-guile.log
 
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = guile-1.8.pc
+
 # Makefile.am ends here

NEWS

@@ -46,6 +46,10 @@ The new repository can be accessed using
 "git-clone git://git.sv.gnu.org/guile.git", or can be browsed on-line at
 http://git.sv.gnu.org/gitweb/?p=guile.git .  See `README' for details.
 
+** Add support for `pkg-config'
+
+See "Autoconf Support" in the manual for details.
+
 * New modules (see the manual for details)
 
 ** `(srfi srfi-88)'

configure.in

@@ -1430,6 +1430,12 @@ AC_SUBST(top_builddir_absolute)
 top_srcdir_absolute=`(cd $srcdir && pwd)`
 AC_SUBST(top_srcdir_absolute)
 
+dnl We need `sitedir' in `guile-1.8.pc'.
+dnl Note: `sitedir' must be kept in sync with `GUILE_SITE_DIR' in `guile.m4'.
+pkgdatadir="$datadir/guile"
+sitedir="$pkgdatadir/site"
+AC_SUBST([sitedir])
+
 # Additional SCM_I_GSC definitions are above.
 AC_SUBST([SCM_I_GSC_GUILE_DEBUG])
 AC_SUBST([SCM_I_GSC_GUILE_DEBUG_FREELIST])
@@ -1476,6 +1482,7 @@ AC_CONFIG_FILES([
   test-suite/standalone/Makefile
 ])
 
+AC_CONFIG_FILES([guile-1.8.pc])
 AC_CONFIG_FILES([check-guile], [chmod +x check-guile])
 AC_CONFIG_FILES([benchmark-guile], [chmod +x benchmark-guile])
 AC_CONFIG_FILES([guile-tools], [chmod +x guile-tools])

doc/ref/ChangeLog

@@ -1,3 +1,9 @@
+2008-05-04  Ludovic Courtès  <ludo@gnu.org>
+
+	* guile.texi (Guile Modules): Include `autoconf.texi'.
+	* autoconf.texi (Autoconf Support): Mention `pkg-config'.
+	(Autoconf Macros): Document `pkg-config' support.
+
 2008-04-26  Ludovic Courtès  <ludo@gnu.org>
 
 	* srfi-modules.texi (SRFI-88): New section.

doc/ref/autoconf.texi

@@ -8,10 +8,10 @@
 @node Autoconf Support
 @chapter Autoconf Support
 
-When Guile is installed, a set of autoconf macros is also installed as
-PREFIX/share/aclocal/guile.m4.  This chapter documents the macros provided in
-that file, as well as the high-level guile-tool Autofrisk.  @xref{Top,The GNU
-Autoconf Manual,,autoconf}, for more info.
+When Guile is installed, a pkg-config description file and a set of
+Autoconf macros is installed.  This chapter documents pkg-config and
+Autoconf support, as well as the high-level guile-tool Autofrisk.
+@xref{Top,The GNU Autoconf Manual,,autoconf}, for more info.
 
 @menu
 * Autoconf Background::         Why use autoconf?
@@ -45,7 +45,38 @@ checks.
 @node Autoconf Macros
 @section Autoconf Macros
 
-The macro names all begin with "GUILE_".
+@cindex pkg-config
+@cindex autoconf
+
+GNU Guile provides a @dfn{pkg-config} description file, installed as
+@file{@var{prefix}/lib/pkgconfig/guile.pc}, which contains all the
+information necessary to compile and link C applications that use Guile.
+The @code{pkg-config} program is able to read this file and provide this
+information to application programmers; it can be obtained at
+@url{http://pkg-config.freedesktop.org/}.
+
+The following command lines give respectively the C compilation and link
+flags needed to build Guile-using programs:
+
+@example
+pkg-config guile --cflags
+pkg-config guile --libs
+@end example
+
+To ease use of pkg-config with Autoconf, pkg-config comes with a
+convenient Autoconf macro.  The following example looks for Guile and
+sets the @code{GUILE_CFLAGS} and @code{GUILE_LIBS} variables
+accordingly, or prints an error and exits if Guile was not found:
+
+@findex PKG_CHECK_MODULES
+
+@example
+PKG_CHECK_MODULES([GUILE], [guile])
+@end example
+
+Guile comes with additional Autoconf macros providing more information,
+installed as @file{@var{prefix}/share/aclocal/guile.m4}.  Their names
+all begin with @code{GUILE_}.
 
 @c see Makefile.am
 @include autoconf-macros.texi

doc/ref/guile.texi

@@ -177,6 +177,8 @@ x
 
 * Guile Modules::
 
+* Autoconf Support::
+
 Appendices
 
 * Data Representation::             All the details.
@@ -362,6 +364,8 @@ available through both Scheme and C interfaces.
 @include scsh.texi
 @include scheme-debugging.texi
 
+@include autoconf.texi
+
 @include data-rep.texi
 @include fdl.texi
 

guile-1.8.pc.in

@@ -0,0 +1,15 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+datarootdir=@datarootdir@
+datadir=@datadir@
+
+sitedir=@sitedir@
+libguileinterface=@LIBGUILE_INTERFACE@
+
+Name: GNU Guile
+Description: GNU's Ubiquitous Intelligent Language for Extension
+Version: @GUILE_VERSION@
+Libs: -L${libdir} -lguile @GUILE_LIBS@
+Cflags: -I${includedir} @GUILE_CFLAGS@