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This patch changes Guile to use a default search path relative to the
location of the `guile' binary, allowing it to be relocated.
--- a/libguile/load.c
+++ b/libguile/load.c
@@ -26,6 +26,7 @@
#include <string.h>
#include <stdio.h>
+#include <libgen.h>
#include "libguile/_scm.h"
#include "libguile/alist.h"
@@ -325,6 +326,32 @@
SCM cpath = SCM_EOL;
#ifdef SCM_LIBRARY_DIR
+ char *program, *bin_dir, *prefix, *module_dir, *ccache_dir;
+
+ /* Determine the source and compiled module directories at run-time,
+ relative to the executable's location.
+
+ Note: Use /proc/self/exe instead of argv[0] because the latter is
+ not necessarily an absolute, nor a valid file name. */
+
+ program = scm_gc_malloc_pointerless (256, "string");
+ readlink ("/proc/self/exe", program, 256);
+
+ bin_dir = dirname (strdupa (program));
+
+ prefix = scm_gc_malloc_pointerless (strlen (bin_dir) + 4, "string");
+ strcpy (prefix, bin_dir);
+ strcat (prefix, "/..");
+ prefix = canonicalize_file_name (prefix);
+
+ module_dir = scm_gc_malloc_pointerless (strlen (prefix) + 50, "string");
+ strcpy (module_dir, prefix);
+ strcat (module_dir, "/share/guile/2.0");
+
+ ccache_dir = scm_gc_malloc_pointerless (strlen (prefix) + 50, "string");
+ strcpy (ccache_dir, prefix);
+ strcat (ccache_dir, "/lib/guile/2.0/ccache");
+
env = scm_i_mirror_backslashes (getenv ("GUILE_SYSTEM_PATH"));
if (env && strcmp (env, "") == 0)
/* special-case interpret system-path=="" as meaning no system path instead
@@ -333,10 +360,7 @@
else if (env)
path = scm_parse_path (scm_from_locale_string (env), path);
else
- path = scm_list_4 (scm_from_locale_string (SCM_LIBRARY_DIR),
- scm_from_locale_string (SCM_SITE_DIR),
- scm_from_locale_string (SCM_GLOBAL_SITE_DIR),
- scm_from_locale_string (SCM_PKGDATA_DIR));
+ path = scm_list_1 (scm_from_locale_string (module_dir));
env = scm_i_mirror_backslashes (getenv ("GUILE_SYSTEM_COMPILED_PATH"));
if (env && strcmp (env, "") == 0)
@@ -346,8 +370,7 @@
cpath = scm_parse_path (scm_from_locale_string (env), cpath);
else
{
- cpath = scm_list_2 (scm_from_locale_string (SCM_CCACHE_DIR),
- scm_from_locale_string (SCM_SITE_CCACHE_DIR));
+ cpath = scm_list_1 (scm_from_locale_string (ccache_dir));
}
#endif /* SCM_LIBRARY_DIR */
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