I am new to static checking and I am assigned a task to do static checking of C code. I am given the liberty to select any one tool keeping in mind that the organisation already uses lint so a lint based tool should be preferred.
I selected splint because it is a free software. (PC lint and Lint being commercial)
Now I tried compiling a simple C file which had #include <unistd.h>
Splint shows error:
/usr/include/unistd.h:221:26: Parse Error:
Suspect missing struct or union keyword: __ssize_t :
int. (For help on parse errors, see splint -help parseerrors.)
Cannot continue.
How can I get this working?
I read in some places that splint doesn't support C99 standard whereas some says it supports. Can anyone tell me whether I should reconsider my choice as I will be using C99 format. What are the other free alternatives which are very similar to lint/splint?
Related
I'm having trouble getting started with Metal's shader compilation.
How to make a MTLLibrary that can link to a MTLDynamicLibrary (or MTLLinkedFunctions), in particular a library that declares extern functions that are to be resolved at runtime when providing preloadedLibraries (or linkedFunctions) in the compute pipeline descriptor? For example, I can compile the following to air using xcrun metal (with option -c), but then invoking xcrun metallib (even with option --split-module-without-linking) gives the error LLVM ERROR: Undefined symbol: _Z3addjj. In other words, how do I make a 'partially bound' metal library?
// shader.h
extern uint add(uint a, uint b);
/// shader.metal
#include "shader.h"
kernel void kernel_func(uint gid [[ thread_position_in_grid ]]) { add(gid,2); }
WWDC2021 mentions this extern technique, but the Dynamic Library Code Sample from the previous year doesn't use extern (or the installName), so I don't make sense of it.
When creating an executable library that uses a dynamic library, there are two points where you must include the dynamic library (I thought there was only one).
The process is different depending on whether the executable source is compiled at build or runtime. I'll describe for the case of runtime, because I haven't yet figured out the case for the executable library created from a metallib file.
The first point is when you compile the executable, where you must include the dynamic library in the libraries field of the CompileOptions. The library is there at this point just as a dummy, to check that you have a dynamic library that defines the declarations allowing for proper linkage, though that linkage doesn't occur at this stage, just the checking.
The second point is when you create the pipeline state, where you must include the dynamic library in the preloadedLibraries field of the pipeline descriptor. This time, the dynamic library is not a dummy but the real library you plan to use, as it will be linked with the executable during pipeline creation.
I couldn't find sample code for a clang-tidy command line for fixing the following error:
[archlinux#thinkpad fizzbuzz]$ clang-tidy fizzbuzz2.cpp -checks=cppcoreguidelines-pro-bounds-constant-array-index
5 warnings generated.
fizzbuzz2.cpp:21:18: warning: do not use array subscript when the index is not an integer constant expression; use gsl::at() instead [cppcoreguidelines-pro-bounds-constant-array-index]
std::cout << arr[index] << std::endl;
^
Suppressed 4 warnings (4 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
[archlinux#thinkpad fizzbuzz]$
I just want to find out how I can get clang-tidy to fix this automatically. If not, how should I use gsl::at() to fix this? The clang-tidy documentation says the following:
cppcoreguidelines-pro-bounds-constant-array-index
This check flags all array subscript expressions on static arrays and std::arrays that either do not have a constant integer expression index or are out of bounds (for std::array). For out-of-bounds checking of static arrays, see the -Warray-bounds Clang diagnostic.
This rule is part of the “Bounds safety” profile of the C++ Core Guidelines, see https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Pro-bounds-arrayindex.
Options
GslHeader
The check can generate fixes after this option has been set to the name of the include file that contains gsl::at(), e.g. “gsl/gsl.h”.
IncludeStyle
A string specifying which include-style is used, llvm or google. Default is llvm.
I found the gsl::at() subroutine in <gsl/gsl_util>. How do I tell clang-tidy to use it to fix my warning?
Edit: I looked at the config string and found the solution to this:
On running:
clang-tidy fizzbuzz2.cpp -checks=cppcoreguidelines-pro-bounds-constant-array-index -dump-config
I got some hints towards the solution
clang-tidy fizzbuzz2.cpp -checks=cppcoreguidelines-pro-bounds-constant-array-index -config="{CheckOptions: [{key: cppcoreguidelines-pro-bounds-constant-array-index.GslHeader, value: gsl/gsl_util}]}" -fix
Edit: I looked at the config string and found the solution to this:
On running:
clang-tidy fizzbuzz2.cpp -checks=cppcoreguidelines-pro-bounds-constant-array-index -dump-config
I got some hints towards the solution
clang-tidy fizzbuzz2.cpp -checks=cppcoreguidelines-pro-bounds-constant-array-index -config="{CheckOptions: [{key: cppcoreguidelines-pro-bounds-constant-array-index.GslHeader, value: gsl/gsl_util}]}" -fix
I try to use the well known "jpeglib" now available in version 9.
Overview: I am a programming starter in C using MS Visual C++ 2010 Express and read a C-book finally. My goal is to compress a RGB(.bmp)-file into JPEG. So I downloaded the jpeglib (v9), read all the install and so on *.txt-files. It was possible to compile the C-files to get cjpeg.exe, djpeg.exe, jpeg.lib and so on.
After this success I tried to use the example.c to get deeper into the jpeg and to control the compression. -> It did not work. Then I tried to use the jpeglib included in OpenCV. Same non working result, while the OpenCV code samples are compiled successfully.
I googled lots of samples, problem solutions and tips how to use jpeglib. Most helpful information I found here. But in the result I was still not able to compile my own jpeg-tool or example.c (rewriting the write_JPEG_file() function ).
Question: What in the basics could be wrong, when every other programmer just uses #include "jpeglib.h" in their codes to run the jpeg functions successfully? For me including this file seems not to be enough. Because of that I have to ask you and to relaunch a one year old Question that also did not helped solving my probs. I can not give you a specific error message because of multiple attempts to solve those issues.
Here is my current MS-VC++2010 config for using OpenCV 2.4.6:
C/C++ -> General -> Additional Include Directories:
C:\opencv\build\include
C:\opencv\build\include\opencv
C:\opencv\build\include\opencv2
C:\opencv\include
C:\opencv\include\opencv
C:\opencv\include\opencv2
C:\opencv\3rdparty\libjpeg
Linker -> General -> Additional Library Directories:
C:\opencv\build\x86\vc10\lib
Linker -> Input -> Additional Dependencies:
opencv_core246d.lib
opencv_imgproc246d.lib
opencv_highgui246d.lib
opencv_ml246d.lib
opencv_video246d.lib
opencv_features2d246d.lib
opencv_calib3d246d.lib
opencv_objdetect246d.lib
opencv_contrib246d.lib
opencv_legacy246d.lib
opencv_flann246d.lib
jpeg.lib [this I added into C:\opencv\build\x86\vc10\lib]
At last some threads I have already read:
Compressing IplImage to JPEG using libjpeg in OpenCV - 1
Compressing IplImage to JPEG using libjpeg in OpenCV - 2
Need help in reading JPEG file using libjpeg
how can i use jpeg_mem_src, jpeg_mem_dest in libjpeg-turbo?
If there is something missing you want to know I will do my best to add this information!
EDIT - Some error messages:
1>jpeg_coder.obj : error LNK2001: unresolved external symbol ""unsigned char * image_buffer" (?image_buffer##3PAEA)".
1>jpeg_coder.obj : error LNK2001: unresolved external symbol ""int image_height" (?image_height##3HA)".
1>jpeg_coder.obj : error LNK2001: unresolved external symbol """int image_width" (?image_width##3HA)".
First symbol should be typedefed in jpeglib.h as JSAMPLE FAR *JSAMPROW,
second and third are defined in rdjpgcom.c as unsigned int image_height, image_width;
Maybe, with a lot of luck, I figured out what is need to be done to get jpeglib running. In the current state I have to check and double check whether my problem solution is correct or not. At this point thank you very much for your attention for my issues. As soon as I am sure with the solution I will post it.
Problem Solution: I did not setup OpenCV correctly for using jpeglib. The mistake I made was to link the wrong *.lib-file. The proper file for linking is libjpegd.lib. Too bad that jpeglib v6.2 is included in OpenCV 2.4.6 instead of v9. The hint to add HAVE_JPEG to use jpeglib functions inside OpenCV I ignored completely. For now the problem is solved.
Problem Solution: I did not setup OpenCV correctly for using jpeglib. The mistake I made was to link the wrong *.lib-file.
The proper file for linking is libjpegd.lib.
Too bad that jpeglib v6.2 is included in OpenCV 2.4.6 instead of v9. The hint to add HAVE_JPEG to use jpeglib functions inside OpenCV I ignored completely. Thanks to all who tried solving this issue. For now the problem is solved.
I'm still learning how to program but I have a simple question. I have the following code for running an executable COBOL program through C++, but I am getting COBOL errors: 251 and 410
#include <iostream>
#include <windows.h>
using namespace std;
int main(){
system("C:\\rmcobol\\runcobol.exe SOLOCAJA.COB c=windows.cfg L=WOWRT.DLL");
cout << "\n";
system("pause");
return 0;
}
I assume there must be a very simple reason for this, but I am clueless so far. Any help would be highly appreciated.
Error 410 is a "configuration file not found" error based on Apendix A of the user guide. Are you sure your windows.cfg file is in the directory you're running your code in?
Failing that, error 251 states "Incorrect runtime command" and all the samples I can find have an uppercase C. So maybe change your C program to use to:
system("C:\\rmcobol\\runcobol.exe SOLOCAJA.COB C=WINDOWS.CFG L=WOWRT.DLL");
and see if that fixes it (a long shot, I know, but I've seen stranger things than that).
Based on update:
I tried changing the c to a C on the C=WINDOWS.CFG, ran it in C++ and directly on the Command Line, no change. I am still looking into the reasons behind this, and I read through tek-tips.com/viewthread.cfm?qid=1119251&page=5 but I couldn't use any of that info. Any extra tips would be gold at this point. THANKS!
A couple of questions:
Has it ever worked in this environment?
Is it failing on both cmdline and within C (just want to clarify)?
Does windows.cfg actually exist in the current directory when you run it?
Are you running it in a directory with spaces (like My Documents)?
Other than that, maybe post the windows.cfg file, though the error seems pretty explicit that it's config file not found rather than error in config file.
Why I try to run the following OpenCV program, it shows the following error :
ERROR:
test_1.exe - Application Error
The application failed to initialize properly (0x80000003).
Click on OK to terminate the application.
CODE:
#include "cv.h"
#include "highgui.h"
int main()
{
IplImage *img = cvLoadImage("C:\\face.bmp");
cvSetImageROI(img, cvRect(100,100, 100, 100));
cvAddS(img, cvScalar(50), img);
cvResetImageROI(img);
cvShowImage("Test", img);
cvWaitKey(0);
return 0;
}
When i press F5(im using vs2008express), the program encounters a break point...i have attached a picture...dont know, whether, it will help or not.
Error Snapshot Link
It is not that, only this program is producing this error, but also any kind of image manipulation funciton containing (OpenCV)program is resulting in this sitution.
Such as : cvSmooth
one last thing, it there any dedicated OpenCV forum or sth like that?
I am an administrator.So, yes, ive the permission.
a version mismatch.
sorry, i didn't get it?Version mismatch with what?
But, i have found the error using dependency walker.
Warning: At least one module has an unresolved import due to a missing export
function in a delay-load dependent module.
and also found that, it is a common problem, and found some info in the FAQ of DW...
Why am I seeing a lot of applications where MPR.DLL shows up in red under
SHLWAPI.DLL because it is missing a function named WNetRestoreConnectionA?
I also get a "Warning: At least one module has an unresolved import due to
a missing export function in a delay-load dependent module" message.
Function name : WNetRestoreConnectionA
But there is no guideline about how to solve it. Though, they say, it is not a problem.
i googled a little and found a suggestion.It says,
Turn off your compilers setting to assume you are programming for Win9x.
(I just lost which setting but it is not that difficult, use a #define...)
But i have no idea, how to do that in Visual Studio 2008 express.
Any suggestion how to solve it...
This usually indicates a problem with a dll; either you don't have permission, or a version is mismatched. Try running as Administrator to see if it is a permissions problem. If that doesn't help, try using the Dependency Walker.