[OE-core] [PATCH] glib-2.0: relocate the GIO module directory for native builds

[Ross Burton]

Glib hard-codes the install path in search path for GIO modules, which causes
problems when glib-2.0-native is restored from sstate with a different build
directory.

In the future we should relocate symbols directly using the same system that the
eSDK uses, but for now use dladdr() to look up where the library was loaded from
to build the search path.

Signed-off-by: Ross Burton <ross.burton at intel.com>
---
 .../glib-2.0/glib-2.0/relocate-modules.patch       | 49 ++++++++++++++++++++++
 meta/recipes-core/glib-2.0/glib-2.0_2.46.2.bb      |  3 +-
 2 files changed, 51 insertions(+), 1 deletion(-)
 create mode 100644 meta/recipes-core/glib-2.0/glib-2.0/relocate-modules.patch

diff --git a/meta/recipes-core/glib-2.0/glib-2.0/relocate-modules.patch b/meta/recipes-core/glib-2.0/glib-2.0/relocate-modules.patch
new file mode 100644
index 0000000..f9e3f3d
--- /dev/null
+++ b/meta/recipes-core/glib-2.0/glib-2.0/relocate-modules.patch
@@ -0,0 +1,49 @@
+Instead of hard-coding GIO_MODULE_PATH when glib is built, use dladdr() to
+determine where libglib.so is and use that path to calculate GIO_MODULES_DIR.
+
+This solves relocation problems with GIOModule for native builds of glib.
+
+Upstream-Status: Inappropriate
+Signed-off-by: Ross Burton <ross.burton at intel.com>
+
+diff --git a/gio/giomodule.c b/gio/giomodule.c
+index 56c498c..a2e32b7 100644
+--- a/gio/giomodule.c
++++ b/gio/giomodule.c
+@@ -47,6 +47,27 @@
+ #include "gdesktopappinfo.h"
+ #endif
+ 
++#include <dlfcn.h>
++
++/*
++ * Generate a GIO module directory based on where glib is installed
++ */
++static const char *
++_get_gio_module_dir (void)
++{
++  Dl_info info;
++
++  if (dladdr (g_io_module_new, &info)) {
++    char *libdir = g_path_get_dirname (info.dli_fname);
++    char *dir = g_build_filename (libdir, "gio", "modules", NULL);
++    g_free (libdir);
++    return dir;
++  } else {
++    return GIO_MODULE_DIR;
++  }
++}
++
++
+ /**
+  * SECTION:giomodule
+  * @short_description: Loadable GIO Modules
+@@ -1057,7 +1078,7 @@ _g_io_modules_ensure_loaded (void)
+       /* Then load the compiled in path */
+       module_dir = g_getenv ("GIO_MODULE_DIR");
+       if (module_dir == NULL)
+-        module_dir = GIO_MODULE_DIR;
++        module_dir = _get_gio_module_dir ();
+ 
+       g_io_modules_scan_all_in_directory_with_scope (module_dir, scope);
+ 
diff --git a/meta/recipes-core/glib-2.0/glib-2.0_2.46.2.bb b/meta/recipes-core/glib-2.0/glib-2.0_2.46.2.bb
index bf3cade..2a2efae 100644
--- a/meta/recipes-core/glib-2.0/glib-2.0_2.46.2.bb
+++ b/meta/recipes-core/glib-2.0/glib-2.0_2.46.2.bb
@@ -18,7 +18,8 @@ SRC_URI = "${GNOME_MIRROR}/glib/${SHRT_VER}/glib-${PV}.tar.xz \
            file://gi-exclude.patch \
           "
 
-SRC_URI_append_class-native = " file://glib-gettextize-dir.patch"
+SRC_URI_append_class-native = " file://glib-gettextize-dir.patch \
+                                file://relocate-modules.patch"
 
 SRC_URI[md5sum] = "7f815d6e46df68e070cb421ed7f1139e"
 SRC_URI[sha256sum] = "5031722e37036719c1a09163cc6cf7c326e4c4f1f1e074b433c156862bd733db"
-- 
2.7.0