Author Archives: Robins

MySQL character set error resolution: err=Error 3988: Conversion from collation utf8mb4_unicode_ci into utf8_general_ci impo

The content of a field contains expressions. When inserting mysql, you will be prompted with an error:

err=Error 3988: Conversion from collation utf8mb4_unicode_ci into utf8_general_ci impossible for parameter

solve:

1. Modify MySQL character set

I am using docker

  1. Modify mysql.cnfmaps to docker where /etc/mysql/mysql.cnf:
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4

[mysqld]
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
datadir         = /var/lib/mysql
secure-file-priv= NULL
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect='SET NAMES utf8mb4'
      1. start command parameter addition:
 --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci

After restarting the container, enter Mysql to view:

mysql> SHOW VARIABLES WHERE Variable_name LIKE 'character_set_%' OR Variable_name LIKE 'collation%';
+--------------------------+--------------------------------+
| Variable_name            | Value                          |
+--------------------------+--------------------------------+
| character_set_client     | utf8mb4                        |
| character_set_connection | utf8mb4                        |
| character_set_database   | utf8mb4                        |
| character_set_filesystem | binary                         |
| character_set_results    | utf8mb4                        |
| character_set_server     | utf8mb4                        |
| character_set_system     | utf8mb3                        |
| character_sets_dir       | /usr/share/mysql-8.0/charsets/ |
| collation_connection     | utf8mb4_unicode_ci             |
| collation_database       | utf8mb4_unicode_ci             |
| collation_server         | utf8mb4_unicode_ci             |
+--------------------------+--------------------------------+
11 rows in set (0.17 sec)

2. Modify the character set of table

        1. modify the character set of a specific table:
DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
          1. modify the character set of a specific field:
CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci

[Solved] MybatisPlusException: Error: Method queryTotal execution error of sql

Cause: com.baomidou.mybatisplus.core.exceptions.MybatisPlusException: Error: Method queryTotal execution error of sql :

Error reason:
the user-defined SQL is written in mapper, where is added too much, and the user-defined SQL is transferred into querywrapper, where cannot be added
error code:

String customSql="select * from ("+queryAll+") as q where ${ew.customSqlSegment}";
    @Select(customSql)
    IPage<BranchBasic> baseQuery(Page<Object> objectPage, @Param(Constants.WRAPPER)QueryWrapper queryWrapper);

Correct code:
as both case and upper case are OK

String customSql="select * from ("+queryAll+") as q ${ew.customSqlSegment}";
    @Select(customSql)
    IPage<BranchBasic> baseQuery(Page<Object> objectPage, @Param(Constants.WRAPPER)QueryWrapper queryWrapper);

It can be opened with localhost, but not with IP address. The request host name is invalid

Problem point
the webapi compiled by vs can only be used

http://localhost:64734/API/Default/GETIP

unavailable

http://127.0.0.1:64734/API/Default/GETIP

The solution is
1, find the. Vs folder

2, find the file D: desktop, webapiarduino. Vs, config, applicationhost. Config
the path depends on the project.

D:\Desktop\WebAPIArduino

After searching the localhost, change the localhost to *

the modified result

is valid.

Microservice call exceptions: error feign.RetryableException: Read timed out executing POST http://xxx…….

Recently, when upgrading Nacos server from version 1.3 to version 1.4, the above exception occurred when the interface service called the basic search service. Because sometimes it is normal and sometimes it times out, it is speculated that the version of the registered client is too low, so the version of Nacos client was upgraded, but to no avail. After searching for a solution in douniang, most of what I saw was the timeout configuration of ribbon. At first, I didn’t think it was necessary when introducing components. I didn’t find the reason, so I decided to start with the code debugging and printing stack, and found that it was really the timeout configuration problem. Suddenly feel Oolong! Thought which is so unprofessional, casually annotated my configuration file!! Normal operation after uncomment!!!

Timeout configuration:

#Set the feign timeout to solve the timeout problem on the first call
feign:
  client:
    config:
      default:
        connectTimeout: 5000
        readTimeout: 5000

Attach exception stack:

2021-05-28 14:41:28.706 ERROR 2702 --- [nio-9004-exec-7] com.jlkj.controller.ExceptionAdvice      : error feign.RetryableException: Read timed out executing POST http://base-search/activity/search/recommend/list
	at feign.FeignException.errorExecuting(FeignException.java:249)
	at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:120)
	at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:80)
	at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:100)
	at com.sun.proxy.$Proxy457.list(Unknown Source)
	at com.jlkj.service.recommend.impl.RecommendServiceImpl.indexRecommend2(RecommendServiceImpl.java:222)
	at com.jlkj.controller.recommend.RecommendController.indexRecommend(RecommendController.java:56)
	at com.jlkj.controller.recommend.RecommendController$$FastClassBySpringCGLIB$$3786b9d4.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:55)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
	at com.jlkj.controller.recommend.RecommendController$$EnhancerBySpringCGLIB$$623bd307.indexRecommend(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:665)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at com.jlkj.controller.RequestWrapperFilter.doFilterInternal(RequestWrapperFilter.java:28)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:124)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:109)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.SocketTimeoutException: Read timed out
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
	at java.net.SocketInputStream.read(SocketInputStream.java:170)
	at java.net.SocketInputStream.read(SocketInputStream.java:141)
	at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
	at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
	at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
	at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:704)
	at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:647)

[Solved] ValueError: check_hostname requires server_hostname

Error prompt:

ERROR: Exception:
Traceback (most recent call last):
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\cli\base_command.py", line 180, in _main
    status = self.run(options, args)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\cli\req_command.py", line 204, in wrapper
    return func(self, options, args)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\commands\install.py", line 318, in run
    requirement_set = resolver.resolve(
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 127, in resolve
    result = self._result = resolver.resolve(
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 473, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 341, in resolve
    name, crit = self._merge_into_criterion(r, parent=None)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 172, in _merge_into_criterion
    if not criterion.candidates:
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\resolvelib\structs.py", line 139, in __bool__
    return bool(self._sequence)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 143, in __bool__
    return any(self)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 129, in <genexpr>
    return (c for c in iterator if id(c) not in self._incompatible_ids)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 30, in _iter_built
    for version, func in infos:
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\resolution\resolvelib\factory.py", line 258, in iter_index_candidate_infos
    result = self._finder.find_best_candidate(
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\index\package_finder.py", line 879, in find_best_candidate
    candidates = self.find_all_candidates(project_name)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\index\package_finder.py", line 824, in find_all_candidates
    page_candidates = list(page_candidates_it)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\index\sources.py", line 134, in page_candidates
    yield from self._candidates_from_page(self._link)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\index\package_finder.py", line 783, in process_project_url
    html_page = self._link_collector.fetch_page(project_url)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\index\collector.py", line 512, in fetch_page
    return _get_html_page(location, session=self.session)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\index\collector.py", line 422, in _get_html_page
    resp = _get_html_response(url, session=session)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\index\collector.py", line 120, in _get_html_response
    resp = session.get(
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\requests\sessions.py", line 555, in get
    return self.request('GET', url, **kwargs)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_internal\network\session.py", line 449, in request
    return super().request(method, url, *args, **kwargs)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\requests\sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\requests\sessions.py", line 655, in send
    r = adapter.send(request, **kwargs)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\cachecontrol\adapter.py", line 53, in send
    resp = super(CacheControlAdapter, self).send(request, **kw)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\requests\adapters.py", line 439, in send
    resp = conn.urlopen(
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 696, in urlopen
    self._prepare_proxy(conn)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 964, in _prepare_proxy
    conn.connect()
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\urllib3\connection.py", line 359, in connect
    conn = self._connect_tls_proxy(hostname, conn)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\urllib3\connection.py", line 500, in _connect_tls_proxy
    return ssl_wrap_socket(
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 432, in ssl_wrap_socket
    ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls)
  File "d:\python\sdk\py3.9.5\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 474, in _ssl_wrap_socket_impl
    return ssl_context.wrap_socket(sock)
  File "d:\python\sdk\py3.9.5\lib\ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "d:\python\sdk\py3.9.5\lib\ssl.py", line 997, in _create
    raise ValueError("check_hostname requires server_hostname")
ValueError: check_hostname requires server_hostname
WARNING: You are using pip version 21.1.1; however, version 21.1.3 is available.
You should consider upgrading via the 'd:\python\sdk\py3.9.5\python.exe -m pip install --upgrade pip' command.

My Python version:

solution implementation:

pip install  urllib3==1.25.11

Mac Appium Error: Error executing adb Exec. Original error…

Appium error on MAC, error executing ADB exec. Original error

Error message: error executing adbexec. Original error: ‘command’/users/noogler/library/Android/SDK/platform tools/ADB – P 5037 – s clb7n18528000446 shell ‘settings delete global hidden_ api_ policy_ pre_ p_ apps; settings delete global hidden_ api_ policy_ p_ apps; settings delete global hidden_ api_ policy” exited with code 1

Process summary

Error information

: Error executing adbExec. Original error: ‘Command ‘/Users/noogler/Library/Android/sdk/platform-tools/adb -P 5037 -s CLB7N18528000446 shell ‘settings delete global hidden_ api_ policy_ pre_ p_ apps; settings delete global hidden_ api_ policy_ p_ apps; settings delete global hidden_ api_ policy’’ exited with code 1

Process

After clicking the start session button in appium, you can enter the page without screenshot and throw an error. After a long time in Google, stackworkflow, CSDN and GitHub failed to solve the problem for a long time. After updating the bundle tools of Android studio to the Android 11 version, it still has no effect. The SDK version of Android studio has 29 30 31. The Android device version connected to the computer is 10. The calling of the third-party Android SDK has been modified, but there is no solution.

adb shell settings put global hidden_ api_ policy_ p_ apps 1
*adb shell settings put global hidden_ api_ policy_ pre_ p_ Apps 1 reduces the version of appium desktop from 1.21 to 1.17!! So I tried to use version 1.21 on another iMac, and it also started successfully! The result of appium doctor is that all required and optional are installed. The Java SDK version is also 1.8. Try to find the appium configuration file to see if the configuration of 1.21 is different from that of 1.17. Finally, the ADB stopped responding, and the kill – server didn’t respond. It’s better to restart. Fortunately, after the restart, appium version 1.21 also successfully started the session, and no error was reported. 😂😂

Summary

If the results of appium doctor are all installed, there are also versions of Android SDK, JDK version is also 1.8, and so on. Direct suggestion

adb kill-server
adb start-server
adb shell

Maybe it can be solved. If there is no solution, you are welcome to throw out the mistakes and discuss them together. Even if I agree, it is not allowed to reprint

TensorFlow Install Error: Could not load dynamic library ‘*****.dll‘； dlerror: ********.dll not found

After the installation of tensorflow2. X is successful, after running the following code:

tf.config.list_physical_devices('GPU')

There are always the following situations: (Note: there are usually multiple, only two here are shown here)

Could not load dynamic library ‘cublas64_ 10.dll’; dlerror: cublas64_ 10.dll not found

Could not load dynamic library ‘cudnn64_ 7.dll’; dlerror: cudnn64_ 7.dll not found

Solution:

Download the corresponding DLL file and put it into the folder C: Windows: system32.

The problem was solved successfully Pro test (valid)

So the key to the problem, where to download these DLL files, rest assured, this article will provide you with all the required DLL files.

[Solved] Error: Cannot find module ‘webpack-cli/package.json‘

Solution:npm install webpack-cli -g

Error: Cannot find module 'webpack-cli/package.json'
Require stack:
- C:\Users\12987\AppData\Roaming\npm\node_modules\webpack\bin\webpack.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
    at Function.resolve (internal/modules/cjs/helpers.js:94:19)
    at runCli (C:\Users\12987\AppData\Roaming\npm\node_modules\webpack\bin\webpack.js:65:26)
    at C:\Users\12987\AppData\Roaming\npm\node_modules\webpack\bin\webpack.js:154:5
    at processTicksAndRejections (internal/process/task_queues.js:93:5) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    'C:\\Users\\12987\\AppData\\Roaming\\npm\\node_modules\\webpack\\bin\\webpack.js'
  ]
}

[Solved] hello.s:15 Error: junk at end of line, first unrecognized character valued 0x8

gccThe compiler reports the following error.
hello.s: warning: end of file, not end of line; insert new line
hello.s:1: Error: junk at end of line, first unrecognized character valued 0x7f
hello.s:1: Error: junk at end of line, first unrecognized character valued 0x3
hello.s:1: Error: junk at end of line, first unrecognized character is >' hello.s:1: Error: junk at end of line, first unrecognized character valued 0x1 hello.s:1: Error: junk at end of line, first unrecognized character is0′
hello.s:1: Error: junk at end of line, first unrecognized character is @' hello.s:1: Error: junk at end of line, first unrecognized character is(‘
hello.s:1: Error: junk at end of line, first unrecognized character is @' hello.s:1: Error: junk at end of line, first unrecognized character is8′
hello.s:1: Error: junk at end of line, first unrecognized character is @' hello.s:1: Error: junk at end of line, first unrecognized character valued 0x1b hello.s:1: Error: junk at end of line, first unrecognized character valued 0x1a hello.s:1: Error: junk at end of line, first unrecognized character valued 0x1a hello.s:1: Error. junk at end of line, first unrecognized character valued 0x6 hello.s:1: Error: junk at end of line, first unrecognized character valued 0x4 hello.s:1: Error: junk at end of line, first unrecognized character is@’
There is no correct solution on the Internet, so I studied it carefully. gcc compiler is fine, the problem is that the gcc code is typed in the wrong case!
The correct command is as follows

gcc -E hello.c -o hello.i -v
gcc -S hello.i -o hello.s -v
gcc -c hello.s -o hello.o -v

When generating the. S file, the s of GCC – s should be capitalized
otherwise, an error will occur when GCC – C generates the. O file!!