Add libsodium to the tree and build what's needed from source.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3859 ed5197a5-7fde-0310-b194-c3ffbd925b24

deps/libsodium/dist-build/generate-emscripten-symbols.sh

@@ -0,0 +1,57 @@
+#! /bin/sh
+
+set -e
+
+symbols() {
+  {
+    SUMO="$1"
+    while read symbol standard sumo; do
+      found="$standard"
+      if [ "x$SUMO" = "xsumo" ]; then
+        found="$sumo"
+      fi
+      if [ "$found" = "1" ]; then
+        eval "defined_${symbol}=yes"
+      else
+        eval "defined_${symbol}=no"
+      fi
+    done < emscripten-symbols.def
+
+    /usr/bin/nm /usr/local/lib/libsodium.23.dylib | \
+    fgrep ' T _' | \
+    cut -d' ' -f3 | {
+      while read symbol; do
+        eval "found=\$defined_${symbol}"
+        if [ "$found" = "yes" ]; then
+          echo "$symbol"
+        elif [ "$found" != "no" ]; then
+          echo >&2
+          echo "*** [$symbol] was not expected ***" >&2
+          echo >&2
+          exit 1
+        fi
+      done
+    }
+  } | \
+    sort | \
+    {
+      out='"_malloc","_free"'
+      while read symbol ; do
+        if [ ! -z "$out" ]; then
+          out="${out},"
+        fi
+        out="${out}\"${symbol}\""
+      done
+      echo "[${out}]"
+    }
+}
+
+out=$(symbols standard)
+sed s/EXPORTED_FUNCTIONS_STANDARD=\'.*\'/EXPORTED_FUNCTIONS_STANDARD=\'${out}\'/ < emscripten.sh > emscripten.sh.tmp && \
+  mv -f emscripten.sh.tmp emscripten.sh
+
+out=$(symbols sumo)
+sed s/EXPORTED_FUNCTIONS_SUMO=\'.*\'/EXPORTED_FUNCTIONS_SUMO=\'${out}\'/ < emscripten.sh > emscripten.sh.tmp && \
+  mv -f emscripten.sh.tmp emscripten.sh
+
+chmod +x emscripten.sh