I tried to build something with GnatColl from GPS Community 2021 on Fedora 35. The linker failed, saying
ld: /path/to/common/Ada/Quoter/obj/gnatcoll-refcount.o: in function `gnatcoll__refcount__sync_bool_compare_and_swap':
gnatcoll-refcount.adb:(.text+0x622): undefined reference to `gnatcoll_sync_bool_compare_and_swap_access'
collect2: error: ld returned 1 exit status
This also fails if I try to run the project using gprbuild -P Quoter.gpr.
I can fix this from the command line by copying the failed command (gcc ...) and adding ~/opt/GNAT/2021/include/gnatcoll/gnatcoll_support.c to the list of files to compile, as that's the included file with the desired function. That's awfully inconvenient, though.
I guess I have something configured slightly wrong. Might anyone here have an idea?
I found the answer, and it's a bit embarrassing, but looking in the gnatcoll examples would have done it: add with "gnatcoll"; to the beginning of the gpr file.
Related
I've been trying to get the regex.h library to work all day, but it's not working. (Here are my VS Code workspace configurations: https://github.com/EnderCommunity/Murmur/tree/main/.vscode - all the compiler info are here)
This is the file that I was trying to get the regex library to work with:
https://github.com/EnderCommunity/Murmur/blob/main/compiler/libraries/regex/reg.h
I tried to include the library normally, but it returns an error:
And I tried to include this library, but it returns some compiling errors:
> Executing task: C/C++: gcc.exe build active file <
Starting build...
"C:\Program Files\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin\gcc.exe" -g C:\Users\adels\Desktop\EnderCommunity\Projects\Murmur\compiler\start.c -o C:\Users\adels\Desktop\EnderCommunity\Projects\Murmur\compiler\start.exe
C:\Users\adels\AppData\Local\Temp\ccifSq1r.o: In function `regChk':
C:/Users/adels/Desktop/EnderCommunity/Projects/Murmur/compiler/libraries/regex/reg.h:15: undefined reference to `__imp_regcomp'
C:/Users/adels/Desktop/EnderCommunity/Projects/Murmur/compiler/libraries/regex/reg.h:22: undefined reference to `__imp_regexec'
C:/Users/adels/Desktop/EnderCommunity/Projects/Murmur/compiler/libraries/regex/reg.h:33: undefined reference to `__imp_regerror'
C:/Users/adels/Desktop/EnderCommunity/Projects/Murmur/compiler/libraries/regex/reg.h:40: undefined reference to `__imp_regfree'
collect2.exe: error: ld returned 1 exit status
Build finished with error(s).
The terminal process terminated with exit code: -1.
Terminal will be reused by tasks, press any key to close it.
So the way that I included this library might be wrong! What am I doing wrong here?
Using MSYS2 will fix this, it comes with all the necessary libraries for C.
As the title suggests, I am having a problem linking some libraries to my code. Minuit2 is in
/home/christian/root/include
and when I compile I run the following:
g++ -I/home/christian/root/include niminimzationExample.cpp -o niminimzationExample -L/Minuit2/lib -lMinuit2
which gives me the following error
/usr/bin/ld: cannot find -lMinuit2
collect2: error: ld returned 1 exit status
Being a newbie, I am not even sure what the error exactly means or how to fix it. I run Minuit2 on another machine, which the same command, and everything works fine. Any help would be greatly appreciated.
Thanks,
Christian
I am not even sure what the error exactly means
The error means: linker searched for a file named libMinuit2.so and libMinuit2.a in /Minuit2/lib/ and then standard directories (usually /usr/lib and /lib), and didn't find it anywhere.
or how to fix it.
You need to find the directory in which one or both of libMinuit2.{so,a} are located, and then use -L/that/directory at link time to tell the linker where to find the library.
Thank you #stark I was unaware you had to link the directory as part of #include. This part is now working though when I include.
(sodium_init() < 0)
{
printf("Sodium could not be initialized");
return 1;
}
I now receive the error "undefined reference to 'sodium_init'.
I have tried adding -lsodium to the compile command (gcc -g -lsodium file1.c file2.c file1.h -o file1.c.exe) which gives the error.
"cannot find -lsodium collect2.exe: error: ld returned 1 exit status"
Through further searching I believe I need to tell the compiler where to find -lsodium though cannot find out how.
-- below has been solved using #stark advice --
I have been trying to get the sodium library working for the last 3 days. I have followed the instillation instructions here(https://libsodium.gitbook.io/doc/installation) which all appear to have completed successfully, but still receive the error.
I then found information suggesting I have not linked Visual Studio (community edition) to the library location.
I have attempted to follow the instructions here(https://www.learncpp.com/cpp-tutorial/a2-using-libraries-with-visual-studio-2005-express/) but cannot see "VC++ Directories". I have tried several other sets of directions with the same outcome.
Is anyone able to help getting the sodium library working so I can get access to the RtlGenRandom() function?
I am trying to cross compile a simple program with the arm toolchain. And stdio library points to another library, which results in the following error:
/home/sansari/tools/arm-eabi-4.7/bin/arm-eabi-gcc hello.c -o hello
In file included from hello.c:3:0:
/home/sansari/tools/arm-eabi-4.7/bin/../lib/gcc/arm-eabi/4.7/include-fixed/stdio.h:50:23: fatal error: sys/cdefs.h: No such file or directory
compilation terminated.
make: *** [hello] Error 1
At first, I thought this file is in some subdirectory of the toolchain, and I need to include the folder for this library in my makefile. But a quick tree output says that it is not. So given that I have used this toolchain successfully for a larger project, I know it is copied from somewhere. So my question is how do I add it to this project please? And what is the appropriate place to copy it from? I am trying to understand why it is not in the toolchain folders that I have, and how I should add it to my project please.
#Olaf - You have been very helpful; I however have a little more learning curve. But I do understand what you are instructing. I know I have the libraries in my build system since have built for this platform successfully. I even know that it is in my WORKING_DIRECTORY. What I do not know is if I can copy a folder and address the issue entirely or do I need to keep compiling and see what errors I get. That is do it incrementally. For example, one of the files, which was missing was cdefs.h. And I was able to find it in the folder:
/home/sansari/ndk/android-ndk-r10d/platforms/android-19/arch-arm/usr/include/sys/cdefs_elf.h
So I copied it over and the build process proceeded to the next stage. I do like to know if I should perhaps have copied the entire /sys or /include directory or compared the /include directory of my source and make sure all the files are also in the destination directory also. And that way I can avoid having to compile a number of times.
But nevertheless, I proceeded with copying one file at a time. The last error I got is:
/home/sansari/tbt/tools/arm-eabi-4.7/bin/../lib/gcc/arm-eabi/4.7/include/stdint.h:3:26: fatal error: stdint.h: No such file or directory
And I look in the include directory; I see a file call stdint.h
What do you make of that? Does that make sense to you? I am confused by this error. How can I get this error when the file is in the directory. Basically it seems make is saying this file does not exist when it does.
I did find This post also, which seems to say what you are saying. I just need to know what is the best way to address it.
#Olaf - I really appreciate all your help. I was able to get through all the library errors by putting an include statement in my makefile. Now the linker is giving me errors as follows:
/home/sansari/tbt/tools/arm-eabi-4.7/bin/arm-eabi-gcc -I../../ndk/android-ndk-r10d/platforms/android-19/arch-arm/usr/include hello.c -o hello
/home/sansari/tbt/tools/arm-eabi-4.7/bin/../lib/gcc/arm-eabi/4.7/../../../../arm-eabi/bin/ld: cannot find crt0.o: No such file or directory
/home/sansari/tbt/tools/arm-eabi-4.7/bin/../lib/gcc/arm-eabi/4.7/../../../../arm-eabi/bin/ld: cannot find -lc
collect2: error: ld returned 1 exit status
make: *** [hello] Error 1
update - I searched for a solution for the above errors. The first error is discussed here and -nostartfiles switch seems to work for me for now. I found this link that talks about libc.a being the fix for the error about not finding -lc. So I found an appropriate copy of libc.a and passed the location to the linker. The program compiles, but I get one last warning as follows:
warning: cannot find entry symbol _start; defaulting to 00000000000080dc
For which this link suggested using --entery-main switch. So now I have an executable. I want to thank you again. If you do see any problem in what I have done, please post something for me. it is gonna take a while for me to get this executable on my device.
I am faced with the exact same situation as the question raised by Gustavo in the following Link. Also, I have tried all the solutions posted in that link and other tags (such as changing library names from opus.a to libopus.a, change '\' to '/' and so on) but none of these have solved my problem. By opening the properties of the library file, these are the following things displayed:
Path: /demo/opusfile/libopusfile.a
Type: File (Static Library)
Location: U:\data\Jag\eclipse\wrksp\demo\opusfile\libopusfile.a
The error message displayed by Mingw is as follows:
15:56:57 **** Incremental Build of configuration Debug for project demo ****
Info: Internal Builder is used for build
gcc -o demo.exe "src\\demo.o" -lU:/data/Jag/eclipse/wrksp/demo/opusfile/libopusfile.a
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: cannot find -lU:/data/Jag/eclipse/wrksp/demo/opusfile/libopusfile.a
collect2.exe: error: ld returned 1 exit status
collect2.exe: error: ld returned 1 exit status
Could someone please let me know what am I missing ? I am not able to resolve this issue
I think I found the solution, thanks to the answer posted in this Link. So basically to summarize the solution, I had to remove the 'lib' prefix, the '.a' suffix and the library path when I specified the libraries (-l parameters). The library path has to be specified in the -L parameter . This resolved the above problem but led to another hurdle by Mingw:
libopusfile.dll.a: could not read symbols: Archive has no index; run ranlib to add one.
I executed the 'ranlib' command in the command prompt
cmd_path> ranlib libopusfile.dll.a
, as suggested by the compiler, and this solved all my issues!