Install GCC 9 on Raspberry Pi and build C++17 programs

commands.sh

# Commands used in the video https://youtu.be/-bCG87jBDqA :

sudo apt update && sudo apt upgrade -y

git clone https://bitbucket.org/sol_prog/raspberry-pi-gcc-binary.git
cd raspberry-pi-gcc-binary
tar -xjvf gcc-9.1.0-armhf-raspbian.tar.bz2
sudo mv gcc-9.1.0 /opt
cd ..
rm -rf raspberry-pi-gcc-binary

cd ~
echo 'export PATH=/opt/gcc-9.1.0/bin:$PATH' >> ~/.bashrc
echo 'export LD_LIBRARY_PATH=/opt/gcc-9.1.0/lib:$LD_LIBRARY_PATH' >> ~/.bashrc
. ~/.bashrc
sudo ln -s /usr/include/arm-linux-gnueabihf/sys /usr/include/sys
sudo ln -s /usr/include/arm-linux-gnueabihf/bits /usr/include/bits
sudo ln -s /usr/include/arm-linux-gnueabihf/gnu /usr/include/gnu
sudo ln -s /usr/include/arm-linux-gnueabihf/asm /usr/include/asm
sudo ln -s /usr/lib/arm-linux-gnueabihf/crti.o /usr/lib/crti.o
sudo ln -s /usr/lib/arm-linux-gnueabihf/crt1.o /usr/lib/crt1.o
sudo ln -s /usr/lib/arm-linux-gnueabihf/crtn.o /usr/lib/crtn.o

g++-9.1 -std=c++17 -Wall -pedantic test_fs.cpp -o test_fs
./test_fs

test_fs.cpp

// Build/compile with:
// g++-9.1 -std=c++17 -Wall -pedantic test_fs.cpp -o test_fs
#include <iostream>
#include <filesystem>

int main() {
    for(auto &file : std::filesystem::recursive_directory_iterator("./")) {
        std::cout << file.path() << '\n';
    }
}

I had to use 'sudo git clone...', 'sudo tar..' and 'sudo rm -f ...'

Thanks!

just tried on my rpi model 3 b+ and for both gcc-9.1.0 and gcc-10.1.0 (which also happened to be in the archive file) it fails with following error:

command: g++-10.1 -std=c++17 -Wall -pedantic test_fs.cpp -o test_fs

In file included from /opt/gcc-10.1.0/include/c++/10.1.0/arm-linux-gnueabihf/bits/os_defines.h:39,
                 from /opt/gcc-10.1.0/include/c++/10.1.0/arm-linux-gnueabihf/bits/c++config.h:518,
                 from /opt/gcc-10.1.0/include/c++/10.1.0/iostream:38,
                 from test_fs.cpp:3:
/usr/include/features.h:424:12: fatal error: sys/cdefs.h: No such file or directory
  424 | #  include <sys/cdefs.h>
      |            ^~~~~~~~~~~~~
compilation terminated.

Any ideas?

Double check if you've executed all the symbolic links commands (you will beed to adapt these for your GCC 10.1.0 if necessary). It seems to me that some header files are not found so one of the symbolic links from commands.sh was not properly adapted to your case.

Here is a text version of the video tutorial https://solarianprogrammer.com/2017/12/08/raspberry-pi-raspbian-install-gcc-compile-cpp-17-programs/ it may be easier to see the commands.

I have tripple checked, and followed the steps for 9.1.0 version first, only then tried 10.1.0 when the 9.1.0 didn't work..

additionally, tried the link you've just provided me with - i have exactly the same error:

pi@bo100nka-pi:~ $ g++-10.1 -std=c++17 -Wall -pedantic if_test.cpp -o if_test
In file included from /opt/gcc-10.1.0/include/c++/10.1.0/arm-linux-gnueabihf/bits/os_defines.h:39,
                 from /opt/gcc-10.1.0/include/c++/10.1.0/arm-linux-gnueabihf/bits/c++config.h:518,
                 from /opt/gcc-10.1.0/include/c++/10.1.0/iostream:38,
                 from if_test.cpp:1:
/usr/include/features.h:424:12: fatal error: sys/cdefs.h: No such file or directory
  424 | #  include <sys/cdefs.h>
      |            ^~~~~~~~~~~~~
compilation terminated.

Thanks for checking again. I will try on a fresh Raspbian OS install and let you know.

So I did a complete test, I installed the latest Rasperry Pi OS 32 bits Lite, did an upgrade & update, followed exactly the procedure described in the linked article and now I'm able to build C++ programs with GCC 10.1.

I have tripple checked, and followed the steps for 9.1.0 version first, only then tried 10.1.0 when the 9.1.0 didn't work..

additionally, tried the link you've just provided me with - i have exactly the same error:

pi@bo100nka-pi:~ $ g++-10.1 -std=c++17 -Wall -pedantic if_test.cpp -o if_test
In file included from /opt/gcc-10.1.0/include/c++/10.1.0/arm-linux-gnueabihf/bits/os_defines.h:39,
                 from /opt/gcc-10.1.0/include/c++/10.1.0/arm-linux-gnueabihf/bits/c++config.h:518,
                 from /opt/gcc-10.1.0/include/c++/10.1.0/iostream:38,
                 from if_test.cpp:1:
/usr/include/features.h:424:12: fatal error: sys/cdefs.h: No such file or directory
  424 | #  include <sys/cdefs.h>
      |            ^~~~~~~~~~~~~
compilation terminated.

same error here, I tried search those header files, found them under

/usr/include/arm-linux-gnueabihf/sys/

so I copied them to include

sudo cp /usr/include/arm-linux-gnueabihf/sys/* /usr/include/sys/

done

yes, this resolved the problem for me too, thanks a lot