add %site-ccache-dir

* libguile/load.h:
* libguile/load.c (scm_sys_site_ccache_dir): New procedure.

* doc/ref/scheme-using.texi (Installing Site Packages):
* doc/ref/api-options.texi (Build Config): Add docs.

Fixes bug 10326.

doc/ref/api-options.texi

@@ -96,6 +96,13 @@ your site should be installed.  On Unix-like systems, this is usually
 @file{/usr/local/share/guile/site} or @file{/usr/share/guile/site}.
 @end deffn
 
+@deffn {Scheme Procedure} %site-ccache-dir
+@deffnx {C Function} scm_sys_site_ccache_dir ()
+Return the directory where users should install compiled @code{.go}
+files for use with this version of Guile.  Might look something like
+@file{/usr/lib/guile/@value{EFFECTIVE-VERSION}/site-ccache}.
+@end deffn
+
 @defvar %guile-build-info
 Alist of information collected during the building of a particular
 Guile.  Entries can be grouped into one of several categories:

doc/ref/scheme-using.texi

@@ -752,6 +752,7 @@ list}, or simply @code{guild}.
 @cindex site path
 @cindex load path
 @findex %site-dir
+@findex %site-ccache-dir
 
 At some point, you will probably want to share your code with other
 people.  To do so effectively, it is important to follow a set of common
@@ -783,11 +784,11 @@ find them.
 As with Scheme files, Guile searches a path to find compiled @code{.go}
 files, the @code{%load-compiled-path}.  By default, this path has two
 entries: a path for Guile's files, and a path for site packages.  You
-should install your @code{.go} files into the latter.  Currently there
+should install your @code{.go} files into the latter directory, whose
-is no procedure to get at this path, which is probably a bug.  As in the
+value is returned by invoking the @code{%site-ccache-dir} procedure.  As
-previous example, if Guile @value{EFFECTIVE-VERSION} is installed on
+in the previous example, if Guile @value{EFFECTIVE-VERSION} is installed
-your system in @code{/usr/}, then the place to put compiled files for
+on your system in @code{/usr/}, then @code{(%site-ccache-dir)} site
-site packages will be
+packages will be
 @code{/usr/lib/guile/@value{EFFECTIVE-VERSION}/site-ccache}.
 
 Note that a @code{.go} file will only be loaded in preference to a

libguile/load.c

@@ -198,6 +198,19 @@ SCM_DEFINE (scm_sys_global_site_dir, "%global-site-dir", 0,0,0,
 #undef FUNC_NAME
 #endif /* SCM_GLOBAL_SITE_DIR */
 
+#ifdef SCM_SITE_CCACHE_DIR
+SCM_DEFINE (scm_sys_site_ccache_dir, "%site-ccache-dir", 0,0,0,
+            (),
+	    "Return the directory where users should install compiled\n"
+            "@code{.go} files for use with this version of Guile.\n\n"
+	    "E.g., may return \"/usr/lib/guile/" SCM_EFFECTIVE_VERSION "/site-ccache\".")
+#define FUNC_NAME s_scm_sys_site_ccache_dir
+{
+  return scm_from_locale_string (SCM_SITE_CCACHE_DIR);
+}
+#undef FUNC_NAME
+#endif /* SCM_SITE_CCACHE_DIR */
+
 
 
 /* Initializing the load path, and searching it.  */

libguile/load.h

@@ -3,7 +3,7 @@
 #ifndef SCM_LOAD_H
 #define SCM_LOAD_H
 
-/* Copyright (C) 1995,1996,1998,2000,2001, 2006, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1998,2000,2001, 2006, 2008, 2009, 2010, 2011, 2013 Free Software Foundation, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public License
@@ -34,6 +34,7 @@ SCM_API SCM scm_sys_package_data_dir (void);
 SCM_API SCM scm_sys_library_dir (void);
 SCM_API SCM scm_sys_site_dir (void);
 SCM_API SCM scm_sys_global_site_dir (void);
+SCM_API SCM scm_sys_site_ccache_dir (void);
 SCM_API SCM scm_search_path (SCM path, SCM filename, SCM rest);
 SCM_API SCM scm_sys_search_load_path (SCM filename);
 SCM_API SCM scm_primitive_load_path (SCM filename_and_exception_on_not_found);