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-rw-r--r--gnu/packages/base.scm7
-rw-r--r--gnu/packages/patches/glibc-guix-locpath.patch34
2 files changed, 39 insertions, 2 deletions
diff --git a/gnu/packages/base.scm b/gnu/packages/base.scm
index 1b4233420f..5fa8beb26a 100644
--- a/gnu/packages/base.scm
+++ b/gnu/packages/base.scm
@@ -484,6 +484,7 @@ store.")
             (patches (map search-patch
                           '("glibc-ldd-x86_64.patch"
                             "glibc-locale-incompatibility.patch"
+                            "glibc-guix-locpath.patch"
                             "glibc-o-largefile.patch")))))
    (build-system gnu-build-system)
 
@@ -614,9 +615,11 @@ store.")
 
    (native-search-paths
     ;; Search path for packages that provide locale data.  This is useful
-    ;; primarily in build environments.
+    ;; primarily in build environments.  Use 'GUIX_LOCPATH' rather than
+    ;; 'LOCPATH' to avoid interference with the host system's libc on foreign
+    ;; distros.
     (list (search-path-specification
-           (variable "LOCPATH")
+           (variable "GUIX_LOCPATH")
            (files '("lib/locale")))))
 
    (synopsis "The GNU C Library")
diff --git a/gnu/packages/patches/glibc-guix-locpath.patch b/gnu/packages/patches/glibc-guix-locpath.patch
new file mode 100644
index 0000000000..69bb2e50de
--- /dev/null
+++ b/gnu/packages/patches/glibc-guix-locpath.patch
@@ -0,0 +1,34 @@
+Honor a special 'GUIX_LOCPATH' environment variable.
+
+This is most useful when using Guix on top of another distro, which uses an
+different libc version with incompatible locale data.  In this case, setting
+'GUIX_LOCPATH' rather than 'LOCPATH' allows users to tell Guix's libc where to
+look for its locale data without breaking programs that use the other libc.
+
+See <https://lists.gnu.org/archive/html/guix-devel/2015-09/msg00717.html> for
+some background information.
+
+--- a/locale/newlocale.c
++++ b/locale/newlocale.c
+@@ -103,6 +103,8 @@ __newlocale (int category_mask, const char *locale, __locale_t base)
+   locale_path_len = 0;
+ 
+   locpath_var = getenv ("LOCPATH");
++  if (locpath_var == NULL || locpath_var[0] == '\0')
++    locpath_var = getenv ("GUIX_LOCPATH");
+   if (locpath_var != NULL && locpath_var[0] != '\0')
+     {
+       if (__argz_create_sep (locpath_var, ':',
+diff --git a/locale/setlocale.c b/locale/setlocale.c
+index ead030d..0e66c7b 100644
+--- a/locale/setlocale.c
++++ b/locale/setlocale.c
+@@ -252,6 +252,8 @@ setlocale (int category, const char *locale)
+   locale_path_len = 0;
+ 
+   locpath_var = getenv ("LOCPATH");
++  if (locpath_var == NULL || locpath_var[0] == '\0')
++    locpath_var = getenv ("GUIX_LOCPATH");
+   if (locpath_var != NULL && locpath_var[0] != '\0')
+     {
+       if (__argz_create_sep (locpath_var, ':',