字符转码开源库libiconv目前还不支持64位
最新版的libiconv 1.14目前还不支持64位系统，只能编译出32位库。
libiconv 1.14下载地址：
http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.14.tar.gz
libiconv介绍：
http://www.gnu.org/software/libiconv/
linux系统编译安装方法：
$ ./configure --prefix=/usr/local $ make $ make install执行make会报错：
./stdio.h:1010:1: error: ‘gets’ undeclared here (not in a function)
_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
^
make[2]: *** [progname.o] 错误 1
make[2]:正在离开目录 `/home/min/projects/libiconv-1.14/srclib'
make[1]: *** [all] 错误 2
make[1]:正在离开目录 `/home/min/projects/libiconv-1.14/srclib'
make: *** [all] 错误 2
修改方法参考：解决编译libiconv时报错：./stdio.h:1010:1: error: 'gets' undeclared here (not in a function)
修改后make可以通过，但执行make install还是会报错：
/usr/bin/install: cannot create regular file '/usr/local/lib/libcharset.so.1.0.0': Permission denied
make[2]: *** [install] 错误 1
make[2]:正在离开目录 `/home/min/projects/libiconv-1.14/libcharset/lib'
make[1]: *** [install] 错误 2
make[1]:正在离开目录 `/home/min/projects/libiconv-1.14/libcharset'
make: *** [install] 错误 2
提示权限拒绝，需要用管理员权限安装，先执行su或者直接用sudo make install安装。
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Android NDK编译iconv，参考：ndk编译iconv
编译出来的是32位的，64的无法编译成功。
NDK目录下的编译mk文件也只是编译了32位库，Android.mk文件位于：android-ndk-r10e/sources/android/support
内容如下，iconv.c文件只再32位库中编译
LOCAL_PATH := $(call my-dir)
android_support_c_includes := $(LOCAL_PATH)/include
ifneq ($(filter $(NDK_KNOWN_DEVICE_ABI64S),$(TARGET_ARCH_ABI)),)
# 64-bit ABIs
android_support_sources := \
src/musl-locale/catclose.c \
src/musl-locale/catgets.c \
src/musl-locale/catopen.c
else
# 32-bit ABIs
android_support_sources := \
src/libdl_support.c \
src/locale_support.c \
src/math_support.c \
src/stdlib_support.c \
src/wchar_support.c \
src/locale/duplocale.c \
src/locale/freelocale.c \
src/locale/localeconv.c \
src/locale/newlocale.c \
src/locale/uselocale.c \
src/stdio/stdio_impl.c \
src/stdio/strtod.c \
src/stdio/vfprintf.c \
src/stdio/vfwprintf.c \
src/msun/e_log2.c \
src/msun/e_log2f.c \
src/msun/s_nan.c \
src/musl-ctype/iswalnum.c \
src/musl-ctype/iswalpha.c \
src/musl-ctype/iswblank.c \
src/musl-ctype/iswcntrl.c \
src/musl-ctype/iswctype.c \
src/musl-ctype/iswdigit.c \
src/musl-ctype/iswgraph.c \
src/musl-ctype/iswlower.c \
src/musl-ctype/iswprint.c \
src/musl-ctype/iswpunct.c \
src/musl-ctype/iswspace.c \
src/musl-ctype/iswupper.c \
src/musl-ctype/iswxdigit.c \
src/musl-ctype/towctrans.c \
src/musl-ctype/wcswidth.c \
src/musl-ctype/wctrans.c \
src/musl-ctype/wcwidth.c \
src/musl-locale/catclose.c \
src/musl-locale/catgets.c \
src/musl-locale/catopen.c \
src/musl-locale/iconv.c \
src/musl-locale/intl.c \