topic Re: Re:Undefined symbols when building with debug information and -std=c++20 in Intel® MPI Library

Undefined symbols when building with debug information and -std=c++20

fatvlad1744 — Thu, 22 Apr 2021 16:54:10 GMT

Hello!

I'm using Intel HPC toolkit installed on my Fedora OS through yum repository and getting unexpected undefined symbol error when compiling

against C++20 standard (-std=c++20)
with debug information flag (either -g/-g2/-ggdb)

Here's the example program that uses std::allocator<char>:

#include <iostream> #include <memory> int main() { auto buf = std::allocator<char>{}.allocate(10); }

If compiled with icpc -std=c++20 main.cpp no errors are thrown and program starts successfully. However, when compiled with icpc -g2 -std=c++20 main.cpp the following link errors appear:

$ icpc -g2 -std=c++20 main.cpp && ./a.out ld: /tmp/icpcRngryW.o: in function `main': /home/main.cpp:10: undefined reference to `std::allocator<char>::allocate(unsigned long)'

Versions:

$ uname -a Linux localhost.localdomain 5.8.15-301.fc33.x86_64 #1 SMP Thu Oct 15 16:58:06 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux $ icpc --version icpc (ICC) 2021.2.0 20210228 Copyright (C) 1985-2021 Intel Corporation. All rights reserved. $ g++ --version g++ (GCC) 10.2.1 20201125 (Red Hat 10.2.1-9) Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ ld --version GNU ld version 2.35-10.fc33 Copyright (C) 2020 Free Software Foundation, Inc. This program is free software; you may redistribute it under the terms of the GNU General Public License version 3 or (at your option) a later version. This program has absolutely no warranty.

Worth mentioning that I was compiling a large codebase that potentially uses a huge variety of symbols from standard library and only std::allocator<char> was missing.

Also adding -march=native resolves the issue somehow, so it happens only with generic build.
EDIT: Looks like -march=native is not directly related to the resolution. -march=native enables optimizations and therefore strips unneeded symbols.

Any clues? Thanks.

Re:Undefined symbols when building with debug information and -std=c++20

NoorjahanSk_Intel — Fri, 23 Apr 2021 11:39:30 GMT

Hi,

Thanks for reaching out to us.

Could you please try using with icx compiler.

Meanwhile, we will look into the issue internally.

Thanks & Regards

Noorjahan.

Re: Re:Undefined symbols when building with debug information and -std=c++20

fatvlad1744 — Mon, 26 Apr 2021 14:53:46 GMT

Hi Noorjahan,

No such problem with icpx compiler, thanks for workaround!

Re:Undefined symbols when building with debug information and -std=c++20

Viet_H_Intel — Tue, 08 Jun 2021 15:29:12 GMT

I think this issue occurs on a "not yet" supported OS.

I tried the same compiler on Fedora 31 and didn't see an "undefined reference" message.

Please check systems requirements at https://software.intel.com/content/www/us/en/develop/articles/intel-oneapi-hpc-toolkit-system-requirements.html

If you have a Fedora 31, can you see if the issue still persists?

$ uname -a

Linux box 5.8.18-100.fc31.x86_64 #1 SMP Mon Nov 2 20:32:55 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

$ icpc --version

icpc (ICC) 2021.2.0 20210228

$ g++ --version

g++ (GCC) 9.2.1 20190827 (Red Hat 9.2.1-1)

This is free software; see the source for copying conditions. There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ ld --version

GNU ld version 2.32-33.fc31

This program is free software; you may redistribute it under the terms of

the GNU General Public License version 3 or (at your option) a later version.

This program has absolutely no warranty.

$ rm a.out && icpc -std=c++20 test.cpp && ./a.out

$ rm a.out && icpc -std=c++20 test.cpp -g && ./a.out

$ rm a.out && icpc -std=c++20 test.cpp -g2 && ./a.out

$ rm a.out && icpc -std=c++20 test.cpp -ggdb && ./a.out

$ rm a.out && icpc -std=c++20 test.cpp -g2 -O2 && ./a.out

$ rm a.out && icpc -std=c++20 test.cpp -g -O2 && ./a.out

$ rm a.out && icpc -std=c++20 test.cpp -ggdb -O2 && ./a.out

$ cat test.cpp

#include <iostream>

#include <memory>

int main() {

auto buf = std::allocator<char>{}.allocate(10);

}

Re: Undefined symbols when building with debug information and -std=c++20

fatvlad1744 — Fri, 11 Jun 2021 14:37:15 GMT

I think the reason here is not "unsupported OS" but "unsupported compiler version". You need to install GCC 10.2 in order to reproduce the issue.

Re:Undefined symbols when building with debug information and -std=c++20

Viet_H_Intel — Thu, 24 Jun 2021 12:58:23 GMT

Let's wait for the next compiler release.

Thanks,

Re:Undefined symbols when building with debug information and -std=c++20

Viet_H_Intel — Thu, 15 Jul 2021 18:27:37 GMT

We have released oneAPI 2021.3. Please let us know if your issue still persists.

Thanks,

Re: Re:Undefined symbols when building with debug information and -std=c++20

fatvlad1744 — Fri, 16 Jul 2021 15:49:13 GMT

Seems to work now, thanks!

Re:Undefined symbols when building with debug information and -std=c++20

Viet_H_Intel — Fri, 16 Jul 2021 15:54:30 GMT

Thank for your confirmation. We are going to close this thread. If you require additional assistance from Intel, please start a new thread. Any further interaction in this thread will be considered community only.