I am trying to use regex in a c program. i am using windows 10 and Dev-C++ . whenever i add header file for regex i.e.
#include <regex.h>
it gives me error
[error] regex.h: NO such file or directory.
i couldn't figure out how to download and install regex library for c in dev-c++. compiler: TDM-GCC 4.9.2 64-bit Release. Thanks for your help.
I assume there something wrong with the include path during the compilation process. There is a nice expanation of the compilation process of c/c++ applications over here, in case you're interested.
Basically, when compiling a c/c++ application, your compiler, in a first step, scans your source files and replaces all #include <file.h> with the content of file.h it finds in its search path.
Dev-c++ uses MinGW and a port of the GNU compiler collection (gcc) for the compilation process.
Now what you have to do:
Figure out whether regex.h is included in your MinGW installation (Check /usr/include.)
Adapt the include path in dev-c++
Sadly I don't have a computer running Windows nearby making it hard to help with these two steps. To install regex on MinGW this package seems promising.
Related
I'm new to C and this is my first project using visual studio. I have #include <stdio.h> in the first line of the code but there is an error "cannot open source file "stdio.h" C/C++ (1696)". I have installed the Microsoft C/C++ extension. I am happy to clarify anything. Thank you!
Note:
Be aware that VSCode is simply an editor. With some extensions installed, it may help you code "faster & easier".
Solution:
But in order for you to compile the code it is less beginner friendly than IDEs like CodeBlocks.
The way I do it is by going to :
Terminal > New terminal
cd "the_directory_in_which_the_file.c_exists" (don't forget the double quotes)
gcc "file.c"
./a.out (./a.exe on Windows)
Just in case:
if gcc (the compiler in this case) is not installed, then you can quickly do so by following this article's steps if you use Windows, or this one if you are on Linux.
I am trying to compile native linux c files on windows using GNU GCC compilers. For the installation purpose, I have followed the steps mentioned by Faheem in the following link :
Using GCC(minGW) as Matlab's MEX compiler
the example given there compiled successfully. but when i am trying to compile a file using thread functions, the following error is being thrown:
fatal error: pthread.h: No such file or directory
#include
^
compilation terminated.
I have installed all the components from MinGW installer related to GNU C compiler bu still the error persists. Can any one suggest a way to solve this problem. Thanks in advance.
According to the TDM-GCC "Quircks" page, TDM-GCC includes a pthreads emulation layer for Microsoft Windows systems, called "winpthreads", and a recent toolchain you should have x86_64-w64-mingw32\include\pthread.h in the TDM install path. So, I don't know what is wrong with Faheem's instructions, but you should have no trouble including pthread.h if MATLAB is configured correctly.
What is not stated on the TDM Quircks page is that TDM uses Winpthreads from the MinGW-w64 project. From the current README installed with TDM:
"Winpthreads" is one of the libraries distributed by the MinGW-w64 project, and
it allows GCC to be compiled with full pthreads compatibility, which is
necessary to enable std::thread and other threading related functions in the
C++ runtime.
As it states, Pthreads is part of the MinGW-w64 project and you can also get it with MinGW-w64 if you pick a pthreads enabled toolchain. For MinGW-w64, I do the following to set it up (see here for more details):
Grab the latest revision for w64 from Sourceforge (or use the installer to choose the toolchain you want, picking a pthread version).
Extract it so that you have a path to the compiler like C:\mingw-w64\x86_64-4.9.2-release-posix-seh-rt_v3-rev1\bin\x86_64-w64-mingw32-g++.exe. There is no need for MSYS, cygwin, or any other environment if you plan on compiling in MATLAB with mex.
Set it up with a custom mexopts.bat or using the new xml configuration system. On my GitHub repo, I have C++ configurations for MinGW-w64 in both file types: mingw_mexopts.bat and mex_C++_mingw-w64.xml. For example, using the xml file to set up C++ MEX file compilation:
mex -setup:C:\Users\Jon\Documents\MATLAB\mex_C++_mingw-w64.xml C++
If needed, set up the C compiler in a similar manner by modifying the config files.
I posted a more detailed version of the above instructions in my answer to the canonical question on the MinGW-with-MATLAB topic.
I am trying to compile OpenCV on windows using CMAKE and MinGW on Windows. However, when I try to do that I am getting the following error:
The C compiler identification is GNU
The CXX compiler identification is GNU
Check for working C compiler: C:/MinGW/bin/gcc.exe
CMake Error: Generator: execution of make failed. Make command was: make "cmTryCompileExec\fast"
Check for working C compiler: C:/MinGW/bin/gcc.exe -- broken
CMake Error at C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:52 (MESSAGE):
The C compiler "C:/MinGW/bin/gcc.exe" is not able to compile a simple test program.
Does anyone know what could be an issue?
Are you running CMAKE within the MinGW shell or within CMD.exe? The first suggestion I can give you is to use MinGW shell because several environment variables are better setup for the compiler in this way. Otherwise you may have to tweak a little your windows environment variables.
You may have also installed Cygwin (and installed gcc also in cygwin). In this case, if you use CMD.exe and that the bin directory of Cygwin is read first than the one of MinGW in the system PATH variable, you can get this kind of errors too.
I'm a complete beginner to Apple's Xcode, but I have followed the Xcode documentation and the advice of a few related questions without success.
I installed GMP to /usr/local/bin, wrote a short program using the library, and compiled with gcc main.c -lgmp. It compiled with no warnings or errors, and the executable worked flawlessly.
I started a new Xcode project (Command Line Tool; Type: C), copied the code to the newly created main.c, and opened the project build settings. From there I set Linking > Other Linker Flags to -lgmp and Search Paths > Library Search Paths to /usr/local/bin. However, the build fails with the preprocessor error "Gmp.h: No such file or directory".
I have tried almost every header imaginable:
#include "gmp.h"
#include <gmp.h>
#include "gmp"
#include "libgmp.a" . . .
This has been my main obstacle over the last three months which has prevented me from learning C. Any help leading me to an eventual solution would be greatly appreciated.
There's a few things you have to set up in your Xcode project. For example, I have gmp installed in /opt/gmp/5.0.2 and I will use that as an example. The actual library is installed into /opt/gmp/5.0.2/lib and the header files into /opt/gmp/5.0.2/include. When installing the library setting the --PREFIX flag to /opt/gmp/5.0.2 would handle this automatically. If you don't set this flag the prefix is usually set to /usr/local by default.
The Other Linker Flags looks right, it should be the name of the library.
Set the Header Search Path to the include directory, in my case /opt/gmp/5.0.2/include.
Set the Library Search Path to the lib directory, in my case /opt/gmp/5.0.2/lib.
Since the header search path has been set, you should now be able to include the header file like this:
#include <gmp.h>
Of course, replace /opt/gmp/5.0.2 with the PREFIX path you used when you installed gmp.
Lastly, you typically don't install libraries to /usr/local/bin, you would install to /usr/localand let any binaries be installed into bin while libraries like these would be installed into lib. Of course any path scheme would work, I usually recommend /opt/<project-name>/<version-number> since it allows me to keep better track of what I have installed and have multiple versions of the same libraries and tools without having to deal with collisions.
I have updated my system from snow leopard to mountain lion and had to install gmp.
First of all I have installed Xcode CommandLineTools set.
Secondly, installed Homebrew. Then with it I have done steps in this topic: https://apple.stackexchange.com/questions/38222/how-do-i-install-gcc-via-homebrew
In my last step, made changes to an xcode project as colleague Marcus Karlsson told.
It's finally working! Very big Thank You :)
I haven't done C in a long time. I'd like to compile this program, but I have no idea how to proceed. It seems like the makefile refers to GCC a lot and I've never used GCC.
I just want an executable that will run on windows.
You may need to install either cygwin or mingw, which are UNIX-like environments for Windows.
http://www.mingw.org/
http://www.cygwin.com/
When downloading/installing either cygwin or mingw, you will have the option of downloading and installing some optional features; you will need the following:
gcc (try version 2.x first, not 3.x)
binutils
GNU make (or gmake)
If it requires gcc and you want it to run on Windows, you could download Cygwin.
That's basically an emulator for GNU/Linux type stuff for Windows. It works with an emulation DLL.
http://www.cygwin.com/
In order to compile this program you need a C compiler. It does not have to be gcc, although you are already given a makefile set up to use gcc. The simplest thing for you to do would be the following:
Install cygwin
Open the cygwin command prompt
go into the directory where you have your makefile
type 'make'
That should compile your program
If you are not comfortable with using command line tools then you can download the free version of MS Visual Studio and import the source files into a new Visual Studio project. This way you would not need to install cygwin and use gcc, but you would need to know how to create projects and run programs in Visual Studio.
You almost certainly don't need all of cygwin to compile using gcc. There are plenty of standalone gcc clones for Windows, like gcw.
If it's reasonably portable C code (I haven't looked at it), then you may be able to just ignore the included Makefile and feed the source into whatever compiler you do want to use. What happens when you try that?
Dev-C++ provides a simple but nice IDE which uses the Mingw gcc compiler and provides Makefile support. Here are the steps I used to build the above code using Dev-C++ (i.e. this is a "how-to")
After downloading the source zip from NIST, I
downloaded and installed the Dev-C++ 5 beta 9 release
created a new empty project
added all the .c files from sts-2.0\src
Then under Project Options
added -lm in the Linker column under Parameters
added sts-2.0\include to the Include Directories in Directories
set the Executable and Object directories to the obj directory under the Build Options
and then hit OK to close the dialog. Go to Execute > Compile and let it whirl. A minute later, you can find the executable in the sts-2.0\obj directory.
First, there is little chance that a program with only makefiles will build with visual studio, if only because visual studio is not a good C compiler from a standard POV (the math functions in particular are very poorly supported on MS compilers). It may be possible, but it won't be easy, specially if you are not familiar with C. You should really stick to the makefiles instead of trying to import the code in your own IDE - this kind of scienfitic code is clearly meant to be compiled from the command line. It is a test suite, so trying things randomly is NOT a good idea.
You should use mingw + msys to install it: mingw will give you the compilers (gcc, etc...) and msys the shell for the make file to run correctly. Contrary to one other poster, I would advise you against using gcc 2 - I don't see any point in that. I routinely use gcc 3 (and even 4) on windows to build scientific code, it works well when the code is unix-like (which is the standard platform for this kind of code).