c-file to mex-file pnet.c in OS 10.9.5 MATLAB 2012a

Question

florian schertenleib 2016-1-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/262925-c-file-to-mex-file-pnet-c-in-os-10-9-5-matlab-2012a

评论： Walter Roberson 2020-8-6

在 MATLAB Online 中打开

System:

OS 10.9.5

MATLAB R2012a

terminal request: gcc --version

Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix
llvm-gcc --version Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0;

I would like to convert the pnet.c file into a mex-file, see below:

>> mex pnet.c

/Applications/MATLAB_R2012a.app/bin/mex: line 305: gcc-4.2: command not found

mex: pnet.c not a normal file or does not exist.

I'm a beginner and I tried for too long already to find some answer by myself... can anyone help me please?

thanks in advance!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2016-1-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/262925-c-file-to-mex-file-pnet-c-in-os-10-9-5-matlab-2012a#answer_205359

The message is fairly clear: you need to install gcc 4.2 to use that configuration. If it already is installed then you need to create a symbolic link from "gcc-4.2" to the actual software.

4 个评论
显示 2更早的评论隐藏 2更早的评论

florian schertenleib 2016-1-7

在 MATLAB Online 中打开

Thanks for your answer, finally I made it! I installed a newer version of xcode (5.0) and run mex -setup again. besides that, i still get warnings. should i care ?

pnet.c:857:2: warning: add explicit braces to avoid dangling else [-Wdangling-else]
        else
        ^
pnet.c:
879:55: warning: passing 'int *' to parameter of type 'socklen_t *'
      (aka 'unsigned int *') converts between pointers to integer types with different sign
      [-Wpointer-sign]
                                readlen,MSG_NOSIGNAL,(struct sockaddr *)&my_addr, &fromlen);
                                                                                  ^~~~~~~~
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk//usr/include/sys/socket.h:622:25: note: 
      passing argument to parameter here
                socklen_t * __restrict) __DARWIN_ALIAS_C(recvfrom);
                             ^
  pnet.c:990:83: warning: passing 'int *' to parameter of type 'socklen_t *'
        (aka 'unsigned int *') converts between pointers to integer types with different sign
        [-Wpointer-sign]
    ...= accept(sock_fd, (struct sockaddr *)&con[con_index].remote_addr,&sin_size)) > -1)
                                                                        ^~~~~~~~~
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk//usr/include/sys/socket.h:610:69: note: 
        passing argument to parameter here
  int     accept(int, struct sockaddr * __restrict, socklen_t * __restrict)
                                                                          ^
  3 warnings generated.

Walter Roberson 2016-1-7

在 MATLAB Online 中打开

The second and third warnings are applicable to cases where you might have more than 2^31-1 bytes (2 gigabyte) being transferred. If you were working with something that was intended to need to be secure then I would say you need to fix them, but if you are just using the code for your own purposes with no distribution then do not bother.

The warning about the dangling else might indicate a bug in the code. The difficulty is that if you have

if (condition1)
if (condition2)
     ...
else
    ...

then it is not immediately clear in C whether the "else" belongs to the first "if" or to the second "if". C does have rules to resolve it, but it is something that programmers get confused about, so the compiler warns you in case you did not notice that it was happening. It is better to avoid the problem by putting in explicit blocks, either

if (condition1) {
  if (condition2)
    ...
  else
    ...
}

or

if (condition1) {
  if (condition2)
    ...
} else
   ...

The first of those associates the else with the second if, and the second of those associates the else with the first if.

芝赵 2020-7-29

How to solve this probelm when I use mex pnet.c

Tip: the first four red words are 'Error use mex'

blem

Walter Roberson 2020-8-6

在 MATLAB Online 中打开

It looks to me as if you should possibly use

mex pnet.c -lws2_32

请先登录，再进行评论。

c-file to mex-file pnet.c in OS 10.9.5 MATLAB 2012a

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

回答（1 个）

4 个评论
显示 2更早的评论隐藏 2更早的评论

另请参阅

类别

标签

Community Treasure Hunt

c-file to mex-file pnet.c in OS 10.9.5 MATLAB 2012a

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

回答（1 个）

4 个评论 显示 2更早的评论隐藏 2更早的评论

另请参阅

类别

标签

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

4 个评论
显示 2更早的评论隐藏 2更早的评论