Update Android port

* configure.ac: Take option `--with-shared-user-id' and give it
to AndroidManifest.xml.in.
* java/AndroidManifest.xml.in: Substitute that into the
application info.
* java/INSTALL (BUILDING WITH A SHARED USER ID): New section.

2 files changed, 18 insertions, 0 deletions

diff --git a/java/AndroidManifest.xml.in b/java/AndroidManifest.xml.in
index 4ebfe470c0a..f7f834e7582 100644
--- a/java/AndroidManifest.xml.in
+++ b/java/AndroidManifest.xml.in
@@ -69,6 +69,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>. -->
                android:supportsRtl="true"
                android:theme="@style/EmacsStyle"
                android:debuggable="@ANDROID_DEBUGGABLE@"
+               @ANDROID_SHARED_USER_ID@
                android:extractNativeLibs="true">
 
     <activity android:name="org.gnu.emacs.EmacsActivity"
diff --git a/java/INSTALL b/java/INSTALL
index 37f7048b89d..676c63a3cda 100644
--- a/java/INSTALL
+++ b/java/INSTALL
@@ -157,6 +157,23 @@ If you are building an Emacs package for redistribution, we urge you
 to provide both debug and release versions.
 
 
+BUILDING WITH A SHARED USER ID
+
+Sometimes it may be desirable to build Emacs so that it is able to
+access executables from another program.  To achieve this, that other
+program must have a ``shared user ID'', and be signed with the same
+signing key used to sign Emacs (normally `emacs.keystore'.)
+
+Once you have both that signing key and its ``shared user ID'', you
+can give it to configure:
+
+    ./configure --with-shared-user-id=MY.SHARED.USER.ID
+
+Don't do this if you already have Emacs installed with a different
+shared user ID, as the system does not allow programs to change their
+user IDs after being installed.
+
+
 BUILDING WITH THIRD PARTY LIBRARIES
 
 The Android NDK does not support the usual ways of locating third