I am trying to build an lzmat_lib compression library using Eclipse with Cygwin gcc. I downloaded the library from the link http://www.matcode.com/lzmat_lib.zip. The file has the following include files:
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <tchar.h>
#include "lzmat.h"
It cannot find the tchar.h header file. I do not understand how to add this header file. Please suggest a solution.
Your options are to install a Windows development environment, like Visual Studio or mingw along with the Windows SDK, or to port the code to your cygwin (posix) environment.
To port the code, you'd just do this:
Remove #include <tchar.h>.
Search and replace _TCHAR to char.
Search the file for all strings beginning with _t and remove that prefix. E.g., _tfopen becomes just fopen. _tprintf becomes printf.
Search for the text _T and remove it. You could also remove the extra parentheses that will then surround your string.
Deal with any other issues as they come up by removing the dependency on tchar.h and using a standard function instead.
Related
When you have a few files (see below), how do you get them all working inside Xcode for a C implementation?
These are the files that I’ve been given for this project:
pcg_basic.c
pcg_basic.h
pcg32-demo.c
Project guidelines:
http://www.pcg-random.org/using-pcg-c-basic.html
I am also unclear what should be copied to the main.c file. Can't get a grasp on this.
Apparently you also need to link the code with the pcg_basic.o.
(not sure how to do that, either)
I know the code does work because it was developed by an expert in this space. But everything I try in Xcode ("fails to build"), so I presume it must be the way I've set things up.
What am I doing wrong?
*Student here. I am totally new to programming. Thanks!
error snippet 1
error snippet 2
CODE
/*
* PCG Random Number Generation for C.
* For additional information about the PCG random number generation scheme,
* including its license and other licensing options, visit
* http://www.pcg-random.org
*/
/*
* This file was mechanically generated from tests/check-pcg32.c
*/
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#include <string.h>
#include "pcg_basic.h" <---pcg_basic.h not found
To setup:
in Xcode <File/New/Project...>
choose macOS template tab
from there choose Command Line Tool
in the Wizard choose C as language
Drag & drop your files (pcg_basic.h, pcg_basic.c, pcg32-demo.c) to the Xcode project navigator on the left where main.c resides. A dialog appears: make sure to check Copy items if needed. Then delete main.c in Xcode.
The program builds and runs then.
Demo
// Preprocessor directive mention in <> formate :
#include "stdio.h"
#include "stdlib.h"
#include "math.h"
#include "string.h"
#include "limits.h"
#include "stddef.h"
#include "stdint.h"
...
int main()
{
FILE *fin, *fout; //Error[Pe020]: identifier "FILE" is undefined
...
...
...
fprintf(stderr, "%s\n", opus_get_version_string());
//Error[Pe020]: identifier "stderr" is undefined
}
As per above code I got an two Errors :
1) "Error[Pe020]: identifier "FILE" is undefined"
when I found stdlib.h then there are no any kind of "FILE" directive define or typedef.
So,please tell me which changes needed in stdlib.h or stdio.h
2) Error[Pe020]: identifier "stderr" is undefined
So,In which header file stderr define ?
Please tell me How to solve above errors ?
Thanks in advance.
First, FILE is in stdio.h not in stdlib.h. Second, the default library does not include FILE support since this feature uses a lot of space and is seldom needed in embedded systems. To use FILE you must switch to full libraries in the configuration dialog (if you use the IDE) or by using the command line switch --dlib full (if you use the compiler from the command line).
Note that the full library is much larger than the normal library so if the only use of FILE is to print diagnostic messages to stderr I suggest that you use some other way of presenting the messages.
FILE is defined in stdio.h standard header file. As Johan mentioned the default library configuration in IAR IDE does not include full Dlib support.
We can change to Full Dlib support under project options.
Project options shall be opened with ALT + F7 Hotkey or project tab and then options. Check this Image.
Project Options
I am currently trying to create an application in C as an assignment for school, and my professor requires me to use the following to make it compatible with his compiler:
#pragma warning(disable: 4996)
#include<string>
#include<stdlib.h>
#include<time.h>
(I am using visual studio)
And for some reason #include <string> throws up a bunch of run time errors mainly consisting of the one in the title of the question. It pops up within a bunch of other dependencies ranging from cmath, cstudio, cstdlib, cstring, etc. So the bottom line is, can anyone tell me how to fix it? Thanks!
In visual studio you can get this error if you extension is '.c' VS studio will assume the file is type c and not c++ and use the c compiler and not the c++.
In the project settings under advanced options you can select compile as C++ and then files will all be compiled as C++. If you scroll down you will find the flag '-x' on the command line as added to it.
If you are using the gcc compiler this is the same as adding the following to the compiler command '-x c++'
Check the gcc reference for this flag.
The #include <string> is a C++ header file and therefore incompatible with C.
As others have suggested, you can change this to #include <string.h> so that you have a valid C header, however if your professor dictated that you use that specific set of headers, then you need to change your source file to a .ccp file instead of a .c file.
You're including C++ header file. Use #include <string.h>
You are including a C++ library in C code. The header files without any extension are C++ header files. Having ".h" extension are C header files. C++ also accepts C header files still they have no extension. They have given same names having "c" prefix and no ".h" extension.
for example
<string>
is a C++ header
<string.h>
is a C header
<cstring>
is a C header but in a C++ code.
I keep getting this error:
c:\cygwin\usr\include/cygwin/socket.h:55:3: error: expected specifier-qualifier-list before '__uid32_t'
My code is mininmal and still can't compile:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
int main(void) {
puts("!!!Hello World!!!"); /* prints !!!Hello World!!! */
return EXIT_SUCCESS;
}
I have include C:\cygwin\usr\include to compiler path and linker to C:\cygwin\usr\lib
please advise
Headers under C:\cygwin\usr\include, and libraries under C:\cygwin\usr\lib, are for use in the Cygwin environment -- which means they should be referred to via their Cygwin paths, /usr/include and /usr/lib.
I haven't used mingw, but I don't think it's part of Cygwin, and I wouldn't expect it to be able to use Cygwin's headers and libraries.
If you're going to use mingw, you should use the headers and libraries that are installed with it. Don't specify any Cygwin-related directories.
Or you can use Cygwin's gcc (which is optional; you'll have to install it with setup.exe). In that case, you can run gcc or make from the command line. I'm not sure whether Cygwin and Eclipse play nicely together.
I know this question is old, and I'm using a newer version, but I had a similar issue and it was resolved by moving #include <sys/socket.h> one line above #include <sys/types.h>.
Something in types.h appears to be blocking socket.h (not sure how). Wish I had more details on the cause, but hope the solution helps some.
My understanding was always that by doing #include <header.h> it looks in the system include directories, and that #include "header.h" it looks in the local directory. But I was just looking at the python source code and it uses the "header.h" method to define headers in a sibling directory.
So in py3k/Python/ast.c it does #include "Python.h". But Python.h is in py3k/Include/Python.h
Is this something common that I've just never seen, not having worked on any real large C project? How do I tell, at least my IDE, to look in py3k/Include?
Update
I figured out how to tell my IDE to include them, it was just me being stupid and a spelling error. But I'm more interested in why "" works. Is that not the different between "" and <>?
Both #include <header> and #include "header" look in "implementation-defined places", i.e. it depends on the compiler you are using and its settings. For #include <h> it's usually some standard system include directories and whatever you configure the compiler to look in additionally.
The difference between the two versions is that if the search for #include "header" is not supported or fails, it will be reprocessed "as if it read #include <header>" (C99, §6.10.2).
You need to somehow tell your compiler what directories to search in -- for GCC this means using the -I flag. Look it up for your combination of IDE / compiler.