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Asked: 2026-05-14T14:26:48+00:00

I am using cygwin libraries to run C and C++ programs on Windows. gcc

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I am using cygwin libraries to run C and C++ programs on Windows.

gcc runs fine, but with g++, I get a long list of errors. I think these erros are because of linking problems with C libraries.

Can you suggest what I need to do to fix this?

beginning error lines:

In file included from testgpp.cpp:1:
/cygdrive/c/cygwin/bin/../lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdio:52:19: stdio.h: No such file or directory
In file included from testgpp.cpp:1:
/cygdrive/c/cygwin/bin/../lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdio:99: error: `::FILE' has not been declared
/cygdrive/c/cygwin/bin/../lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdio:100: error: `::fpos_t' has not been declared
/cygdrive/c/cygwin/bin/../lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdio:102: error: `::clearerr' has not been declared
/cygdrive/c/cygwin/bin/../lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdio:103: error: `::fclose' has not been declared
/cygdrive/c/cygwin/bin/../lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdio:104: error: `::feof' has not been declared

the whole error dump:
PasteBin

for people asking for source code: this this is clearly a header file linking issue and happens before the compilation even starts. I get the same error for every .cpp file.

#include<cstdio>
#include<cstdlib>
#include<iostream>
#include<vector>
#include<queue>
using namespace std;

int main(){
    cout<<"hello world!";    
}

gives me the very same error.

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1 Answer

  1. Editorial Team

    The key error is:

    In file included from testgpp.cpp:1:
[...]/include/c++/cstdio:52:19: stdio.h: No such file or directory

    The fact that G++ is complaining that it cannot find <stdio.h> (though it leaves the angle brackets out of the message) means you have a compiler configuration problem of some sort. Probably, you are missing a crucial package. I would look to reinstall or update your GCC environment, so that <stdio.h> ends up being found.

    The rest of the problems are consequences of the missing header – the compiler is struggling on without all the information it needs to avoid generating unwarranted errors.

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