I am trying to compile using ARM Compiler. I wrote a simple program.
Where the C:\Source_Codes\2250_sdk\sdkfiles2delivery.....\arm_rvct22\include\windows\ contains all the include files.
Problem : i m facing some unusual linker error
===========================
main.c: 1 warning, 0 errors
Warning: L6310W: Unable to find ARM libraries.
Error: L6218E: Undefined symbol __0printf (referred from main.o).
Error: L6218E: Undefined symbol __main (referred from anon$$obj.o).
Finished: 0 information, 1 warning and 2 error messages.
====================================
Please help me in this
Thanks
regards
Sobin Thomas
With the Arm compiler setting check the Compiler flags and the Linker flags. Try using --verbose to find which Library is missing. Also check if in case you are using environment variable check if the path is correct.
Primary Reasons for this failure reported.
1. Library not found or missing or path not correct
2. Compiling of c code as C++ results in symbol not found, identify the API and try using
extern c{};
Try to add a .c file to project: e. g. if you're working on timers, add stm32f4xx_tim.c to User folder and add it to your project directory.
Related
I am building C++ code using wasm(emsdk version 3.1.3) and cmake(3.15.5) and am getting the following error: -
wasm-ld: error: /Users/...somePath.../boost/boost_thread/libboost_thread.a(thread.obj): undefined symbol: __wasm_lpad_context
Anyone has any idea how to fix this?
I was able to find the answer. You need to add the flag -fwasm-exceptions to your list of compiler and linker flags.
I've had this error for weeks I already made a post about it but it wasn't very clear.
So I am calling a function from a a header file myBmpGris.h and the functions are implemented on the file myBmpGris.c . Here is my main file:
#include<stdio.h>
#include<stdlib.h>
#include "myBmpGris.h"
int main(){
char * image_name = "image_carre.bmp";
BmpImg image = readBmpImage(image_name);
return 0;
I compile by using ggc main.c and I get this error message :
Undefined symbols for architecture x86_64:
"_readBmpImage", referenced from:
_main in main-1c453a.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I read a lot of posts about the same error message but none of the answers seem to apply to my case. I'm kind of desperate because a lot of my programs give me the same error. What should I do ?
You need to tell the compiler about all the code files which contain any of the needed functions.
So if you have until now compiled like gcc main.c, then the simplest way of also getting the other file compiled is gcc main.c myBmpGris.c.
You might want to read up on the other things you can helpfully tell the compiler (and other parts of the building), i.e. the possible commandline parameters. Or use one of the available free programming environments. (I am not going to name any. Just use your favorite search engine on "C IDE free" or similar. The first few hits discuss several, try a few, then use the one your friends use, or the one you really like much, much better.)
There are two thing.
Compilation you have included. h file. It means comilper will make entry in symbol table for all used function from included library.
Linking here linker try to get address from library to fill in symbol table created in first step. This cannot be performed in your case. So give full path of library.
When using Cygwin and GCC under Win 7 and the quad precision library:
gcc -c lquad.c
... this runs OK, but
gcc lquad.o
... produces the following error:
/tmp/ccLM2lOn.o:lquad.c:(.text+0xdb3): undefined reference to `sqrtq'
collect2: error: ld returned 1 exit status
I have #include quadmath.h in a C source, and the __float128 type works, but not the functions (e.g. sqrtq above). This header file has all the relevant externs, e.g.:
extern __float128 sqrtq (__float128) __quadmath_throw;
I found a dll cygquadmath-0.dll which definitely has these functions in it. It is in 3 places in the Cygwin installation. Additionally, I copied it to Windows\System, but that did not help.
There is a related question here, but nothing helped me there and it is not exactly the same error: Quadruple Precision in C++ (GCC)
You are looking for a compiler solution when what you need is a linker solution:
Your code is compiling as it should, so no change in the code would solve your problem:
/tmp/ccLM2lOn.o:lquad.c:(.text+0xdb3): undefined reference to `sqrtq'
collect2: error: ld returned 1 exit status
The undefined reference to errors indicate a function needed by your object is in another library.
As suggested by #Marc Glisse, try adding -lquadmath to your linker line.
I build one DLL on windows with microsoft-visual-c 6.0 including the source code from libxml2. Now I have used some xmlFree() calls in my code and I now get the linker warning LNK4049.
I have not the slightest idea, how to get rid of this warning. I googled, but all info I found was above my comprehension (I use normally gcc under solaris). Is there a simple receipt (add/remove compiler-flag or #define/#undef or similar)?
Thanks,
Peter
I was getting this warning when statically linking against libxml2_a.lib with MSVC 11. I haven't tried the DLL version so I'm not sure if it is affected in the same way.
The solution was to define these symbols in your project or makefile to tell the libxml2 header files to assume static linkage and avoid dll-importing and dll-exporting the xmlFree variable at the same time:
LIBXML_STATIC
The same applies to libxslt/libexslt too:
LIBXSLT_STATIC
LIBEXSLT_STATIC
Hope this helps.
I will add bit more context for others who face similar error like following.
We did libxml upgrade from 2.9.4 to 2.9.14 and we observed following errors which are similar to above .
warning LNK4217: locally defined symbol xmlStrcmp imported in function
"void __cdecl ::updateRunElement(struct _xmlNode *,class xml::XmlDoc &,struct _xmlNode *,struct const &)"
(?updateRunElement#YAXPEAU_xmlNode##AEAVXmlDoc#xml#2##2##Z)
LINK : error LNK1218: warning treated as error; no output file generated
warning LNK4217: locally defined symbol xmlFreeDoc imported in function "public: __cdecl xml::XmlDoc::~XmlDoc(void)" (??1XmlDoc#xml##QEAA#XZ)
LINK : error LNK1218: warning treated as error; no output file generated
All the other answers for this error points to set runtime library to /md (Multithreaded dll) or viceversa.
I also tried to suppress these warning by
#pragma warning( disable : 4217 1218) and also by project setting "Disable Specific Warnings" but both did not work as keep giving warnings/errors.
But as #vladimir. (Thanks for the answer) suggested defining LIBXML_STATIC as preprocessor in the project where you are using libxml library either as static or dynamically linked should fix all these warning errors.
I want to replace pthread_mutex_lock by pthread_mutex_trylock in a function and when I do so, I get the "undefined reference" error message (See below). If I replace the lines 411-13 by pthread_mutex_lock(&cmd_queue_lock), I don't get the linker error.
They are both from the same library which I already include. Why does one generate the linker error and the other doesn't? More importantly, how can I fix it? I tried adding "extern int pthread_mutex_trylock" and changing the order of the .o files in Makefile but both don't work.
$ nl clientmain.c
12 #include <stdio.h>
...
21 #include <pthread.h>
411 if (pthread_mutex_trylock(&cmd_queue_lock) == EBUSY) {
412 continue;
413 }
$ make
clientmain.o: In function `createHC':
clientmain.c:411: undefined reference to `pthread_mutex_trylock'
collect2: ld returned 1 exit status
make: *** [clientmain] Error 1
Admittedly I can't find any reference to a manual page telling this, but adding -lpthread to your final linking phase will probably do the job. I found it by looking for the symbol pthread_mutex_trylock in all /usr/lib/lib*.a files and /usr/lib/libpthread.a was the only one defining the symbol. Reverse engineering.
The manual page of gcc does say that you can/should use the -pthread option to gcc to include POSIX thread support, so that is probably the royal route. This option worked on my system too. Interestingly the regular /usr/lib/libc.a does offer the pthread_mutex_lock but not the pthread_mutex_trylock so that caused your confusion. Note that the manual page of gcc is also saying that this option has effect on preprocessing, so it may be more and better than just linking against /usr/lib/libpthread.a.