From d8894921734f9ca7c9f70dfbf843ab5e04491912 Mon Sep 17 00:00:00 2001
From: Simon Levermann <simon@levermaenner.de>
Date: Thu, 20 Feb 2014 17:54:05 +0100
Subject: [PATCH] Add ./configure option to disable toggle versions

I consider this way cleaner than setting some environment
variable in the build script. Per default, sonames are generated.
If ./configure is run with "--disable-soname-versions", no soname
versions will be generated. This is mainly useful for android, but
it might find some use for other environments without soname versioning
---
 configure.ac | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index a94abbe6..c39f9eb8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -151,7 +151,16 @@ AX_CHECK_COMPILE_FLAG([-fwrapv], [CFLAGS="$CFLAGS -fwrapv"])
 AX_CHECK_COMPILE_FLAG([-fno-strict-aliasing], [CFLAGS="$CFLAGS -fno-strict-aliasing"])
 AX_CHECK_COMPILE_FLAG([-fno-strict-overflow], [CFLAGS="$CFLAGS -fno-strict-overflow"])
 
-LIBTOOL_EXTRA_FLAGS="$LIBTOOL_EXTRA_FLAGS -version-info $SODIUM_LIBRARY_VERSION"
+AC_ARG_ENABLE(soname-versions,
+  [AC_HELP_STRING([--enable-soname-versions], [enable soname versions (must be disabled for android) (default: enabled)])],
+    [
+	AS_IF([test "x$enableval" = "xno"], [
+          LIBTOOL_EXTRA_FLAGS="$LIBTOOL_EXTRA_FLAGS -avoid-version"
+        ], [
+          LIBTOOL_EXTRA_FLAGS="$LIBTOOL_EXTRA_FLAGS -version-info $SODIUM_LIBRARY_VERSION"
+        ])
+    ]
+)
 
 AS_CASE([$host_os],
   [cygwin* | mingw* | pw32* | cegcc*], [