ubuntu-20.04.4环境下ndk-r21e 编译libiconv

编译环境：

ubuntu-20.04.4 NDK-r21e libiconv-1.16.tar.gz

步骤：

一、下载安装NDK并配置环境变量

1、下载android-ndk-r21e-linux-x86_64.zip

wget https://dl.google.com/android/repository/android-ndk-r21e-linux-x86_64.zip

2、解压android-ndk-r21e-linux-x86_64.zip

unzip android-ndk-r21e-linux-x86_64.zip

3、配置NDK环境变量：

打开/etc/profile文件

sudo vi /etc/profile

最后加入环境变量

export NDK_HOME=/home/awa/android-ndk-r21e export PATH=$PATH:$NDK_HOME

让/etc/profile文件生效

source /etc/profile

检查安装是否成功

ndk-build -v

返回

二、下载libiconv-1.16.tar.gz解压并重命名jni

1、下载libiconv-1.16.tar.gz

wget https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.16.tar.gz

2、解压

tar zxvf libiconv-1.16.tar.gz

3.修改文件夹的名称jni

mv libiconv-1.16 jni

三、创建Android.mk文件

1.进入jni创建Android.mk文件

cd jni vi Android.mk

2、在Android.mk写入内容后保存

LOCAL_PATH:= $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := libiconv LOCAL_CFLAGS := \     -Wno-multichar \     -DANDROID \     -DLIBDIR="c" \     -DBUILDING_LIBICONV \     -DIN_LIBRARY   LOCAL_SRC_FILES := \     libcharset/lib/localcharset.c \     lib/iconv.c \     lib/relocatable.c   LOCAL_C_INCLUDES  = \                     $(LOCAL_PATH)/include \                     $(LOCAL_PATH)/libcharset \                     $(LOCAL_PATH)/lib \                     $(LOCAL_PATH)/libcharset/include \                     $(LOCAL_PATH)/srclib #编译动态库 include $(BUILD_SHARED_LIBRARY) #编译静态库 #include $(BUILD_STATIC_LIBRARY)

四、生成config.h文件

./configure

五、make

make

六、编译

ndk-build NDK_DEBUG=0

根目录成功后libs将生成动态库

七、编译过程中的错误

/home/awa/obj/local/arm64-v8a/objs/iconv/libcharset/lib/localcharset.o: In function `locale_charset': /home/awa/jni/libcharset/lib/localcharset.c:696: undefined reference to `nl_langinfo' clang  : error: linker command failed with exit code 1 (use -v to see invocation) make: *** [/home/awa/android-ndk-r21e/build/core/build-binary.mk:725: /home/awa/obj/local/arm64-v8a/libiconv.so] Error 1

查看localcharset.c文件发现HAVE_LANGINFO_CODESET 宏被打开

解决方法

搜索config.h

find . -name "config.h"

将所有config.h中的

#define HAVE_LANGINFO_CODESET 1

改为

 #define HAVE_LANGINFO_CODESET 0