Improve C++ standard library detection on Android

* configure.ac: Stop relaying --with-ndk-cxx-shared to the
nested invocation of configure.

* build-aux/ndk-build-helper-1.mk (SYSTEM_LIBRARIES):

* build-aux/ndk-build-helper-2.mk (SYSTEM_LIBRARIES): Insert all
of the C++ libraries available on Android.

* configure.ac: Call ndk_LATE and ndk_LATE_EARLY within if
statement at toplevel, averting needless calls to AC_PROG_CXX.

* cross/ndk-build/Makefile.in (NDK_BUILD_CXX_STL)
(NDK_BUILD_CXX_LDFLAGS):

* cross/ndk-build/ndk-build.mk.in (NDK_BUILD_CXX_STL)
(NDK_BUILD_CXX_LDFLAGS): New variables.

* cross/ndk-build/ndk-resolve.mk (NDK_SYSTEM_LIBRARIES):
Introduce several other C++ libraries sometimes present on
Android.
(NDK_SO_EXTRA_FLAGS_$(LOCAL_MODULE)): Insert NDK_BUILD_CXX_STL
when any of these new C++ libraries are requested.

* m4/ndk-build.m4: Completely rewrite C++ compiler and library
detection.

* java/org/gnu/emacs/EmacsNative.java (EmacsNative): Attempt to
load more libraries from static initializer.

* java/INSTALL: Remove obsolete information.

2 files changed, 19 insertions, 21 deletions

diff --git a/java/INSTALL b/java/INSTALL
index 175ff2826b2..f1063b40c25 100644
--- a/java/INSTALL
+++ b/java/INSTALL
@@ -166,25 +166,21 @@ than a compressed package for a newer version of Android.
 
 BUILDING C++ DEPENDENCIES
 
-With a new version of the NDK, dependencies containing C++ code should
-build without any further configuration.  However, older versions
-require that you use the ``make_standalone_toolchain.py'' script in
-the NDK distribution to create a ``standalone toolchain'', and use
-that instead, in order for C++ headers to be found.
-
-See https://developer.android.com/ndk/guides/standalone_toolchain for
-more details; when a ``standalone toolchain'' is specified, the
-configure script will try to determine the location of the C++
-compiler based on the C compiler specified.  If that automatic
-detection does not work, you can specify a C++ compiler yourself, like
-so:
-
-  ./configure --with-ndk-cxx=/path/to/toolchain/bin/i686-linux-android-g++
-
-Some versions of the NDK have a bug, where GCC fails to locate
-``stddef.h'' after being copied to a standalone toolchain.  To work
-around this problem (which normally exhibits itself when building C++
-code), add:
+In normal circumstances, Emacs should automatically detect and configure
+one of the C++ standard libraries part of the NDK when such a library is
+required to build a dependency specified under `--with-ndk-path'.
+
+Nevertheless, this process is not infalliable, and with certain versions
+of the NDK is liable to fail to locate a C++ compiler, requiring that
+you run the `make_standalone_toolchain.py' script in the NDK
+distribution to create a ``standalone toolchain'' and substitute the
+same for the regular compiler toolchain.  See
+https://developer.android.com/ndk/guides/standalone_toolchain for
+further details.
+
+Some versions of the NDK that ship GCC 4.9.x exhibit a bug where the
+compiler cannot locate `stddef.h' after being copied to a standalone
+toolchain.  To work around this problem, add:
 
    -isystem /path/to/toolchain/include/c++/4.9.x
 
diff --git a/java/org/gnu/emacs/EmacsNative.java b/java/org/gnu/emacs/EmacsNative.java
index 6845f833908..898eaef41a7 100644
--- a/java/org/gnu/emacs/EmacsNative.java
+++ b/java/org/gnu/emacs/EmacsNative.java
@@ -323,7 +323,9 @@ public final class EmacsNative
        Every time you add a new shared library dependency to Emacs,
        please add it here as well.  */
 
-    libraryDeps = new String[] { "png_emacs", "selinux_emacs",
+    libraryDeps = new String[] { "c++_shared", "gnustl_shared",
+                                 "stlport_shared", "gabi++_shared",
+                                 "png_emacs", "selinux_emacs",
                                  "crypto_emacs", "pcre_emacs",
                                  "packagelistparser_emacs",
                                  "gnutls_emacs", "gmp_emacs",
@@ -331,7 +333,7 @@ public final class EmacsNative
                                  "tasn1_emacs", "hogweed_emacs",
                                  "jansson_emacs", "jpeg_emacs",
                                  "tiff_emacs", "xml2_emacs",
-                                 "icuuc_emacs",
+                                 "icuuc_emacs", "harfbuzz_emacs",
                                  "tree-sitter_emacs", };
 
     for (String dependency : libraryDeps)