initial support for x86 target

compile-gmp-x86.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+if [ ! -x configure ]
+then
+  echo "Run this script from the GMP base directory"
+  exit 1
+fi
+
+export NDK="${HOME}/Downloads/android-ndk-r8b"
+if [ ! -d ${NDK} ]
+then
+  echo "Please download and install the NDK, then update the path in this script."
+  echo "  http://developer.android.com/sdk/ndk/index.html"
+  exit 1
+fi
+
+# Extract an android-9 toolchain if needed
+export TARGET="android-9"
+export TOOLCHAIN="/tmp/${TARGET}-x86"
+if [ ! -d ${TOOLCHAIN} ]
+then
+  ${NDK}/build/tools/make-standalone-toolchain.sh --toolchain=x86-4.6 --platform=${TARGET} --install-dir=${TOOLCHAIN}
+fi
+
+export PATH="${TOOLCHAIN}/bin:${PATH}"
+export LDFLAGS='-Wl,-z,noexecstack,-z,relro'
+export LIBGMP_LDFLAGS='-avoid-version'
+export LIBGMPXX_LDFLAGS='-avoid-version'
+
+################################################################################################################
+
+BASE_CFLAGS='-O2 -pedantic -fomit-frame-pointer'
+
+# x86, CFLAGS set according to 'CPU Arch ABIs' in the r8b documentation
+export CFLAGS="${BASE_CFLAGS} -march=i686 -msse3 -mstackrealign -mfpmath=sse"
+./configure --prefix=/usr --disable-static --build=i686-pc-linux-gnu --host=i686-linux-android
+make -j8 V=1 2>&1 | tee android-x86.log
+make install DESTDIR=$PWD/x86
+cd x86 && mv usr/lib/libgmp.so usr/include/gmp.h . && rm -rf usr && cd ..
+make distclean
+
+exit 0