I am unable to compile my code successfully due to undefined references.
I am using the STM32Cube IDE compiler which is based of atollic true studio.
The undefined references are due to headers not linking.
I have included the headers into my main program and have included them in the include path for the compiler.
#include "base64_codec_transport.h"
#include "line_buffer_transport.h"
#include "modem_ussd_transport.h"
#include "thingstream_transport.h"
#include "client_api.h"
#include "client_platform.h"
#include "client_set_callback.h"
#include "custom_modem_transport.h"
#include "debug_printf_core.h"
#include "log_client_transport.h"
#include "log_modem_transport.h"
#include "log_protocol_transport.h"
#include "log_transport.h"
#include "modem2_transport.h"
#include "modem_set_callback.h"
#include "modem_transport.h"
#include "predefined_topics.h"
#include "quectel_modem2_config.h"
#include "ring_buffer_transport.h"
#include "sdk_data.h"
#include "serial_transport.h"
#include "sim7600_modem2_config.h"
#include "transport_api.h"
#include "ublox_modem2_config.h"
The consol errors are below:
All these functions are defined in their respective headers as follows, to give one example.
#define line_buffer_transport_create Thingstream_createLineBufferTransport
which then points to
extern ThingstreamTransportResult Thingstream_line_buffer_deliver(ThingstreamTransport *self);
I have also rebuilt the index multiple times and still no success.
I don't know what else to do to solve this.
I've created a c project and this is the beginning of the main.c file:
#include <curl/curl.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "include/httpdef.h"
//...some code
The httpdef.h beginning is this:
#ifndef httpdef
#define httpdef
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <curl/curl.h>
//definitions
#endif
At the very first line of both files I get the error from the gcc compiler:
macro name must be an identifier
What could be the problem?
EDIT: I realized now that actually the compiler doesn't give any error, it's my vim plugin (YouCOmpleteMe) that generates this error. If I compile everything works and the error doesn't appear
I've been trying to get cgraph (https://graphviz.gitlab.io/_pages/pdf/cgraph.pdf) working so I read and write some graph files. I tried writing some very basic code:
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <float.h>
#include <limits.h>
#include <math.h>
#include <memory.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <Windows.h>
#include <mysql.h>
#include <graphviz/cgraph.h>
int main() {
FILE *fp = NULL;
fp = fopen("test.dot", "w+");
if (fp == NULL) {
return -1;
}
Agraph_t *g;
g = agopen("test", Agdirected, NULL);
Agnode_t *signal1;
signal1 = agnode(g, "Signal1_ON", TRUE);
Agnode_t *signal2;
signal2 = agnode(g, "Signal1_OFF", TRUE);
Agedge_t *link = agedge(g, signal1, signal2, "link1", TRUE);
agattr(g, AGEDGE, "label", "transitionlink");
agwrite(g, fp);
fclose(fp);
system("pause");
return 0;
}
What should be happening is that the file should be written to test.dot. This code works perfectly fine on Win64 release, but fails on Win64 debug, Win32 debug, and Win32 release. I have double checked the .lib files and .dll files settings in visual studio and in the file directories, making sure to copy the release and debug versions of each platform correctly. However, the agwrite keeps causing a "Microsoft Visual Studio C Runtime Library has detected a fatal error" crash on Win64 debug, Win32 debug, and Win32 release. The weird thing is if I change
agwrite(g, fp); to agwrite(g, stdout);, the code works on all platforms/configurations. I am so confused why this is happening. Here is the source file which contains the code for agwrite if that helps: https://github.com/ellson/MOTHBALLED-graphviz/blob/master/lib/cgraph/write.c
I cannot debug the issue because the source has been compiled into .dlls, and .libs for each platform/configuration.
I appreciate any suggestions/feedback,
Thank you
Edit:
For anyone godly enough to try and get this working on their own system, here are all my binaries, libs, and include files: https://www.dropbox.com/sh/o9tjz7txu4m0k5q/AAAnp8Wu99q9IsFN7kvqZP7Ta?dl=0
Edit 2:
The compiler I am using is MSVC 14 on Windows 10.
I found out that using cgraph directly results in an error when trying to use agwrite(). The solution is to use the GVC abstraction layer which comes with the Graphviz C API to do file I/O. Here is the code that worked:
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <float.h>
#include <limits.h>
#include <math.h>
#include <memory.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <Windows.h>
#include <mysql.h>
#include <graphviz/gvc.h>
int main() {
GVC_t *gvc;
gvc = gvContext();
Agraph_t *g;
g = agopen("test", Agdirected, NULL);
Agnode_t *signal1;
signal1 = agnode(g, "Signal1_ON", TRUE);
Agnode_t *signal2;
signal2 = agnode(g, "Signal1_OFF", TRUE);
Agedge_t *link = agedge(g, signal1, signal2, "link1", TRUE);
agattr(g, AGEDGE, "label", "transitionlink");
gvLayout(gvc, g, "dot");
gvRenderFilename(gvc, g, "dot", "test.dot");
gvFreeLayout(gvc, g);
agclose(g);
gvFreeContext(gvc);
system("pause");
return 0;
}
Edit:
Here is the documentation for GVC: https://graphviz.gitlab.io/_pages/pdf/gvc.3.pdf
The reason of crashing is described on official Graphviz site:
This usually happens when the Graphviz library is built using one version of the stdio library, and the user’s program is compiled using another. If the FILE structure of stdio is different, the call to agread() will cause a crash. This is mainly a problem on Windows where we just provide a binary release built with one version of Visual Studio and stdio changes depending on the version of Visual Studio. It can also occur if the user tries to use cygwin or something similar which may also use an incompatible stdio.
https://graphviz.org/faq/#FaqAgreadCrash
Everything goes well with this statement:
fnmatch(pattern, href, FNM_EXTMATCH);
when I oder the header files as below:
#include <fnmatch.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "link.h"
But the gcc says that FNM_EXTMATCH not defined when I order the head files instead as below:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fnmatch.h>
#include "link.h"
So where is the conflict?
FNM_EXTMATCH is a GNU extension. If you wish to use it, put
#define _GNU_SOURCE
at the top of your file (before any #include statements). Note, however, that it will not be portable to non-GNU systems -- those without gcc and glibc.
why do i get error: 'strcmp': identifier not found in visual studio 2010 C++ Express
#include <string.h>
#include "stdafx.h"
int _tmain(int argc, _TCHAR* argv[])
{
printf("%d",(int)strcmp( "str1", "str2" ));
return 0;
}
Thanks
:( #include <string.h> :(
#include "stdafx.h"
Fun quirk of the MSVC compiler, it generates the exact same error when you compile it like that. Yes, not a lot of 'fun'. It skips everything to find the stdafx.h precompiled header include directive. The string.h doesn't actually get included. Fix:
#include "stdafx.h"
#include <string.h>
Always put the stdafx.h include first.