Problem: Android CI uses outdated C++ ABI 4.8

Solution: switch to 4.9

builds/android/android_build_helper.sh

@@ -80,12 +80,12 @@ function android_build_env {
     
     if [ -z "$TOOLCHAIN_PATH" ]; then
         ANDROID_BUILD_FAIL+=("Please set the TOOLCHAIN_PATH environment variable")
-        ANDROID_BUILD_FAIL+=("  (eg. \"/home/user/android/android-ndk-r11c/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin\")")
+        ANDROID_BUILD_FAIL+=("  (eg. \"/home/user/android/android-ndk-r11c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin\")")
     fi
     
     if [ -z "$TOOLCHAIN_NAME" ]; then
         ANDROID_BUILD_FAIL+=("Please set the TOOLCHAIN_NAME environment variable")
-        ANDROID_BUILD_FAIL+=("  (eg. \"arm-linux-androideabi-4.8\")")
+        ANDROID_BUILD_FAIL+=("  (eg. \"arm-linux-androideabi-4.9\")")
     fi
     
     if [ -z "$TOOLCHAIN_HOST" ]; then
@@ -210,21 +210,21 @@ function _android_build_opts_process_cxx_stl {
         ;;
         esac
     ;;
-    gnustl_shared_48)
+    gnustl_shared_49)
         LIBS+=" -lgnustl_shared"
-        CPPFLAGS+=" -I${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.8/include"
+        CPPFLAGS+=" -I${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.9/include"
         case "${TOOLCHAIN_ARCH}" in
         arm)
-            LDFLAGS+=" -L${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi"
-            CPPFLAGS+=" -I${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi/include"
+            LDFLAGS+=" -L${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi"
+            CPPFLAGS+=" -I${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi/include"
         ;;
         x86)
-            LDFLAGS+=" -L${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.8/libs/x86"
-            CPPFLAGS+=" -I${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.8/libs/x86/include"
+            LDFLAGS+=" -L${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86"
+            CPPFLAGS+=" -I${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/include"
         ;;
         mips)
-            LDFLAGS+=" -L${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.8/libs/mips"
-            CPPFLAGS+=" -I${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.8/libs/mips/include"
+            LDFLAGS+=" -L${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.9/libs/mips"
+            CPPFLAGS+=" -I${ANDROID_NDK_ROOT}/sources/cxx-stl/gnu-libstdc++/4.9/libs/mips/include"
         ;;
         *)
             ANDROID_BUILD_FAIL+=("Unknown combination for ANDROID_BUILD_CXXSTL and TOOLCHAIN_ARCH")

builds/android/build.sh

@@ -8,7 +8,7 @@ ANDROID_BUILD_DIR="$(pwd)"
 source ${ANDROID_BUILD_DIR}/android_build_helper.sh
 
 # Choose a C++ standard library implementation from the ndk
-ANDROID_BUILD_CXXSTL="gnustl_shared_48"
+ANDROID_BUILD_CXXSTL="gnustl_shared_49"
 
 # Set up android build environment and set ANDROID_BUILD_OPTS array
 android_build_env