报错信息如下：
-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
-- Check for working C compiler: /home/xj/asm/host/bin/aarch64-buildroot-linux-gnu-gcc
-- Check for working C compiler: /home/xj/asm/host/bin/aarch64-buildroot-linux-gnu-gcc -- broken
CMake Error at /usr/share/cmake-3.10/Modules/CMakeTestCCompiler.cmake:52 (message):The C compiler"/home/xj/asm/host/bin/aarch64-buildroot-linux-gnu-gcc"is not able to compile a simple test program.It fails with the following output:Change Dir: /home/xj/asm/lv_mygui/S5_LVGL/CMakeFiles/CMakeTmpRun Build Command:"/usr/bin/make" "cmTC_ee744/fast"/usr/bin/make -f CMakeFiles/cmTC_ee744.dir/build.make CMakeFiles/cmTC_ee744.dir/buildmake[1]: Entering directory '/home/xj/asm/lv_mygui/S5_LVGL/CMakeFiles/CMakeTmp'Building C object CMakeFiles/cmTC_ee744.dir/testCCompiler.c.obj/home/xj/asm/host/bin/aarch64-buildroot-linux-gnu-gcc -o CMakeFiles/cmTC_ee744.dir/testCCompiler.c.obj -c /home/xj/asm/lv_mygui/S5_LVGL/CMakeFiles/CMakeTmp/testCCompiler.c/home/xj/asm/host/bin/../libexec/gcc/aarch64-buildroot-linux-gnu/10.3.0/cc1: error while loading shared libraries: libmpfr.so.4: cannot open shared object file: No such file or directoryCMakeFiles/cmTC_ee744.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_ee744.dir/testCCompiler.c.obj' failedmake[1]: *** [CMakeFiles/cmTC_ee744.dir/testCCompiler.c.obj] Error 1make[1]: Leaving directory '/home/xj/asm/lv_mygui/S5_LVGL/CMakeFiles/CMakeTmp'Makefile:126: recipe for target 'cmTC_ee744/fast' failedmake: *** [cmTC_ee744/fast] Error 2CMake will not be able to correctly generate this project.
Call Stack (most recent call first):CMakeLists.txt:18 (project)-- Configuring incomplete, errors occurred!
See also "/home/xj/asm/lv_mygui/S5_LVGL/CMakeFiles/CMakeOutput.log".
See also "/home/xj/asm/lv_mygui/S5_LVGL/CMakeFiles/CMakeError.log".关键信息： '/home/xj/asm/host/bin/../libexec/gcc/aarch64-buildroot-linux-gnu/10.3.0/cc1: error while loading shared libraries: libmpfr.so.4: cannot open shared object file: No such file or directory'
搜索libmpfr.so.4发现它在 
然后修改了CMakeFile.txt里的这句发现cmake 可以执行了 
但是make还是报错 
进入这个目录查看下具体文件信息 
发现有软连接 查看连接发现 
将host/lib里的此文件复制到这里来 
在查看软连接发现就有了 
然后再重新cmake后再make，可以正常执行了！
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