NDK 打包静态库和动态库，交叉编译(三)

在make.sh中给cmake命令添加编译参数：

#!/bin/bash

cd build
rm -rf *
export ANDROID_NDK=~/Android/Sdk/ndk/21.4.7075529
cmake -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK/build/cmake/android.toolchain.cmake \
    -DANDROID_ABI="x86" \
    -DANDROID_NDK=$ANDROID_NDK \
    -DANDROID_PLATFORM=android-23 \
    ..
make

编译参数的解释参考文章https://blog.csdn.net/qq_38410730/article/details/103622813
然后获取模拟器的cpu架构：

sunshuo@sunshuo-virtual-machine:~/AndroidStudioProjects/NDK_2_3_22$ adb shell getprop ro.product.cpu.abi
x86

然后将可执行文件main导入到手机，看下能不能执行

sunshuo@sunshuo-virtual-machine:~/AndroidStudioProjects/NDK_2_3_22$ adb push /home/sunshuo/Desktop/ndk/build/main /data/data/com.example.ndk_2_3_2
/home/sunshuo/Desktop/ndk/build/main: 1 file pushed. 4.2 MB/s (7972 bytes in 0.002s)
sunshuo@sunshuo-virtual-machine:~/AndroidStudioProjects/NDK_2_3_22$ adb shell
generic_x86:/ # cd /data/data/com.example.ndk_2_3_2                                                                                                                                                                                                          
generic_x86:/data/data/com.example.ndk_2_3_2 # ls -l
total 36
drwxrws--x 2 u0_a149 u0_a149_cache 4096 2023-12-25 17:39 cache
drwxrws--x 2 u0_a149 u0_a149_cache 4096 2023-12-25 17:39 code_cache
lrwxrwxrwx 1 root    root            66 2023-12-25 17:39 lib -> /data/app/com.example.ndk_2_3_2-S_248Q3VBMZInCbG1iiF7w==/lib/x86
-rwxrwxrwx 1 root    root          7972 2024-02-18 20:18 main
generic_x86:/data/data/com.example.ndk_2_3_2 # ./main
PI:3.140000
hello world:6
debug:1

可以看到执行成功
那么这个可执行程序在x86架构的手机上可以运行，可以在其他架构的手机上运行吗？
下面新增一个armeabi-v7a的模拟器，重复上面的步骤，发现不能运行。

sunshuo@sunshuo-virtual-machine:~/AndroidStudioProjects/NDK_2_3_22$ adb root
adbd is already running as root
sunshuo@sunshuo-virtual-machine:~/AndroidStudioProjects/NDK_2_3_22$ adb shell getprop ro.product.cpu.abi
armeabi-v7a
sunshuo@sunshuo-virtual-machine:~/AndroidStudioProjects/NDK_2_3_22$ adb push /home/sunshuo/Desktop/ndk/build/main /data/data/com.example.ndk_2_3_2
/home/sunshuo/Desktop/ndk/build/main: 1 file pushed. 0.6 MB/s (8040 bytes in 0.012s)
sunshuo@sunshuo-virtual-machine:~/AndroidStudioProjects/NDK_2_3_22$ adb shell
generic:/ # cd /data/data/com.example.ndk_2_3_2
generic:/data/data/com.example.ndk_2_3_2 # ls -l
total 24
drwxrwx--x 2 u0_a79 u0_a79 4096 2024-02-18 21:49 cache
lrwxrwxrwx 1 root   root     41 2024-02-18 21:49 lib -> /data/app/com.example.ndk_2_3_2-1/lib/arm
-rwxrwxrwx 1 root   root   8040 2024-02-18 21:18 main
generic:/data/data/com.example.ndk_2_3_2 # ./main
/system/bin/sh: ./main: not executable: 32-bit ELF file
1|generic:/data/data/com.example.ndk_2_3_2 # 

修改下cmake编译选项，改为armeabi-v7a，重新打包main，导进来试试

sunshuo@sunshuo-virtual-machine:~/AndroidStudioProjects/NDK_2_3_22$ adb push /home/sunshuo/Desktop/ndk/build/main /data/data/com.example.ndk_2_3_2
/home/sunshuo/Desktop/ndk/build/main: 1 file pushed. 10.5 MB/s (81556 bytes in 0.007s)
sunshuo@sunshuo-virtual-machine:~/AndroidStudioProjects/NDK_2_3_22$ adb shell
generic:/ # cd /data/data/com.example.ndk_2_3_2
generic:/data/data/com.example.ndk_2_3_2 # ls -l
total 168
drwxrwx--x 2 u0_a79 u0_a79  4096 2024-02-18 21:49 cache
lrwxrwxrwx 1 root   root      41 2024-02-18 21:49 lib -> /data/app/com.example.ndk_2_3_2-1/lib/arm
-rwxrwxrwx 1 root   root   81556 2024-02-18 22:00 main
generic:/data/data/com.example.ndk_2_3_2 # ./main
PI:3.140000
hello world:6
debug:1

可以看到，成功运行，说明不同cup架构只能运行对应指令集的可执行程序或者加载库文件。