I am new to programming and have just started to learn C. I would like to use SQLite3 in a c program but am having a hard time setting up the library. I am using old fashion command line interface to compile and run my programs. I am using gcc. I also tried using CodeBlocks and have spent alot of time researching on how to get this to work but no success!
I found a C and SQLite3 tutorial but it doesn't explain this simple concept of setting up the SQLite library with the GCC compliler. I also found another tutorial but it too doesn't explain how to set up the libary with the GCC compiler.
So far I have a simple program called "testsql.c" and this is all I would like to get working:
#include <sqlite3.h>
#include <stdio.h>
int main() {
printf("%s\n", sqlite3_libversion());
return 0;
}
I am using the following gcc command to compile the program:
C:\Users\qwa\Desktop\testsql>gcc testsql.c -o testsql -lsqlite3
The output is always this error:
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: cannot find -lsqlite3
collect2.exe: error: ld returned 1 exit status
Now I have been on SQLite's download webpage and have downloaded the following files and have tried placing them under the MinGW\bin and MinGW\include:
The Amalgamation zip file:
shell.c
sqlite3.c
sqlite3.h
sqlite3ext.h
I also downloaded the dll zip file hoping I could figure out how to link it with CodeBlocks but was unsuccessful. That zip file came with these files:
sqlite3.def
sqlite3.dll
I think my problem is that I just don't know how to make a connection between the SQLite3 libraries and the gcc compiler. I feel like this is such a noob question but I have been struggling :(
Any help would be extremely appreciated!!! To summarize, I just want a SQLite database connection setup with a simple C program.
EDIT: based on the first comment, I just used the following command:
gcc testsql.c -o testsql -LC:\sqlite3\sqlite3.dll
and the result I got was:
C:\Users\qwa\AppData\Local\Temp\ccMjAu3h.o:testsql.c:(.text+0xf):undefined reference to `sqlite3_libversion'
collect2.exe: error: ld returned 1 exit status
any ideas?
The easiest way of using SQLite is to compile it directly into your application:
gcc testsql.c sqlite3.c -o testsql
Related
I installed the hidapi library from Signall11 on my windows10 pc (using minGW). But now I'm having some trouble actually getting it to work with gcc. I have some main.c file in which I include the hidapi.h file. My gcc command looks like
gcc main.c
I'm not sure where I'm going wrong because whenever I try to run this command I get an undefined reference error to some function that is defined in the hidapi.h file.
A full compile command for a project using hidapi is like this:
gcc -o your_app your_app.c -lhidapi-hidraw
It's not enough to include #include "hidapi.h" in the C-code, which does let gcc compile. You also need -lhidapi-hidraw to link with the library. I.e. compiling is in fact a 2 step process.
I'm new to ะก programming and have been trying to compile my code using MinGW/GCC, but I try to include cs50 (cs50.c, cs50.h) library, and the compiler can't find it. Help me compile who knows what's going on.
I tried to give such command: gcc -LC:\Users\apple\Desktop -lcs50 mario.c
But the result is this:
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: cannot find -lcs50
collect2.exe: error: ld returned 1 exit status
Or:
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\Users\apple\AppData\Local\Temp\cc8KpeUr.o:mario.c:(.text+0x33): undefined reference to `GetInt'
collect2.exe: error: ld returned 1 exit status
This is my code:
#include <stdio.h>
#include <cs50.h>
int main()
{
int num = GetInt();
printf("%d\n",num);
}
gcc -LC:\Users\apple\Desktop -lcs50 mario.c
There are two problems here.
Always pass libraries after .c files or they won't actually do anything (unless main is in the library).
You appear to have a library called cs50.a; -lcs50 wants to find a file called libcs50.a or libcs50.so.
The easiest way around this problem is to not bother with -L or -l and just pass your library directly to gcc like this:
gcc mario.c cs50.a
Since cs50.c is a single file, you do not need a library at all. You can compile it as needed to save a few steps, it will consume a couple milliseconds more but most of the time you would not notice.
Just use
gcc mario.c cs50.c
and it will work (provided that both files are in the current folder).
I had the same problem. What i did was that i put the cs50.h and cs50.c files in the same folder or directory as stdio.h ; which you will find in the program files of the compiler you're using. It worked for me. Hope this helps.
I am trying to compile the gjh solver - written in C - into an executable file in windows. It is available on netlib
I downloaded the c file and am using gcc compiler via WinGW on windows' command prompt. Trying to compile the gjh.c file directly gave me an error that says:
gjh.c:33:21: fatal error: getstub.h: No such file or directory
#include "getstub.h"
compilation terminated.
I assumed that compiling gjh.c requires the dependency getstub.h.
getstub.h is not the only dependency required, there are other dependencies, namely: arith.h, asl.h, funcadd.h, and stdio1.h. All of these files are available on the same link where I found getstub.h. However, arith.h0 and stdio1.h0 are available instead of arith.h and stdio1.h.
Are these files the same? I tried to rename the .h0 files to .h and tried to compile gjh.c, but I got this error:
collect2.exe: error: ld returned 1 exit status
Are the two files the same? If not, is there any way for me to compile the gjh solver successfully into an .exe?
If that's the only problem in compiling, try using the -I switch in gcc:
gcc -I/my/path/to/include/files -o gjh gjh.c
the -I switch hints to gcc where to find your #include files.
I am not sure about the stdio1.h. I think your approach to rename is OK but that reference to external functions such as Sprintf. You need to link with a library defining that. If you know where it comes from, use the -L and -l switch in gcc for that:
gcc -I/my/path/to/include/files -L/my/path/to/library -lnameoflibrary \
-o gjh gjh.c
I have tried to compile a C program using FFMPEG but every time I compile it fails at the include statement:
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
Gcc provides this error message:
libavcodec/avcodec.h: No such file or directory
I have installed FFMPEG and created the shared libraries, but when I try to link those libraries when I compile I get the same error.
gcc main.c -L ffmpeg_build/lib -l ffmpeg_build/include/libavcodec/avcodec.h
Do I get this error because I am linking the library incorrectly, or is there some other issue?
This is the first time I am using someone else's library, so please excuse me if I am asking a silly question.
A lowercase -l is a linker option used to specify libraries. They might look like libsomething.a and becomes -lsomething in the linker invocation. In order to add a directory to the header search path, use a capital i, -I.
gcc main.c -L/some/path/ffmpeg_build/lib -I/some/path/ffmpeg_build/include
I installed libsrtp on my ubuntu machine according to the directives in read me, the tests worked fine, and the rptw utility included in libsrtp worked perfectly too. But when I tried to include srtp.h in my HelloWorld! program, it gives me an error that:
fatal error: srtp.h: No such file or directory
compilation terminated.
Concretely, my main file is this
#include "srtp.h"
int main()
{
return 0;
}
My libsrtp.a is present in /usr/local/lib/lib
I used this gcc statement from this blog:
gcc -static main.c -L/usr/local/lib/lib/ -llibsrtp -o main
I will be deeply grateful for any help.
You've found your libsrtp.a , but where is srtp.h ? You'll need to tell the compiler where to search for included files if it's not in a standard location with the -I flag.
Perhaps you need a -I/usr/local/include or -I/usr/local/include/srtp
Note also that -llibsrtp is likely wrong, you need to give the name without the lib prefix. So that makes it -lsrtp