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abhiTronix / raspberry-pi-cross-compilers

Latest GCC Cross Compiler & Native (ARM & ARM64) CI generated precompiled standalone toolchains for all Raspberry Pis. 🍇
https://sourceforge.net/projects/raspberry-pi-cross-compilers
GNU General Public License v3.0
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G++ does not recognize -fmodules-ts #65

Closed MartinMajewski closed 3 years ago

MartinMajewski commented 3 years ago

Hi there,

I am trying to compile the latest and greatest C++20 features but fail to get even the minimal module example to work on my Raspberry Pi 4 with Buster (64bit). I've installed the native GCC-10.2.0 toolchain.

However, in order to build modules, I'll have to use the "-fmodules-ts" compiler argument, which is rejected by telling me that it is an unrecognized option.

What am I missing? The GNU GCC tools should support that by that time.

Best wishes, Martin

abhiTronix commented 3 years ago

@MartinMajewski The repository is in unstable state due to yesterday's update. Please wait few hours before stable binaries are completely build or you can manually build them on any x86_64 linux machine as follows:

# update your system
sudo apt update && sudo apt dist-upgrade

# install prerequisites
sudo apt-get -y install gcc g++ gperf flex texinfo gawk gfortran texinfo bison \
    build-essential openssl unzip wget git pigz \
    libncurses-dev autoconf automake tar figlet

# clone patch
git clone https://github.com/abhiTronix/raspberry-pi-cross-compilers.git && cd raspberry-pi-cross-compilers

# and compile binary:
cd build-scripts
./RTBuilder_64b -g "10.2.0" -o "buster"
abhiTronix commented 3 years ago

@MartinMajewski Please wait for v3.0.6 release (happening in few hours) and then you can download it from sourceforge as usual.

MartinMajewski commented 3 years ago

@abhiTronix Thank's for the reply.

However, I had the binaries downloaded from Sourceforge on Thursday and I'm relating to the native arm64 compilers, which I want to run directly on the RPi 4 with Rasperry OS 64.

Can I assume to build the native compilers with your instruction above as well by changing into the correct subdirectory of your repo?

Edit: Never mind... misread your instructions! Sorry! I will now start the compiling!

Best wishes, Martin

abhiTronix commented 3 years ago

Edit: Never mind... misread your instructions! Sorry! I will now start the compiling!

@MartinMajewski No need. It is already available here: https://sourceforge.net/projects/raspberry-pi-cross-compilers/files/Bonus%20Raspberry%20Pi%20GCC%2064-Bit%20Toolchains/Raspberry%20Pi%20GCC%2064-Bit%20Native-Compiler%20Toolchains/Buster/GCC%2010.2.0/

abhiTronix commented 3 years ago

@MartinMajewski Also, use these exact wiki docs to setup these toolchains which are given here: https://github.com/abhiTronix/raspberry-pi-cross-compilers/wiki/64-Bit-Native-Compiler:-Installation-Instructions#c-extracting-and-linking-binary

Goodluck, and let me know if something doesn't worked.

MartinMajewski commented 3 years ago

@abhiTronix

  1. Just downloaded the latest release that you pointed me to:

Tested quickly with the -fmodules-ts option by calling g++-10.2.0 (gcc, c++, etc.) with it but got

g++-10.2.0: error: unrecognized command-line option ‘-fmodules-ts’

What do I not understand here?

Edit: Reference https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Modules.html#C_002b_002b-Modules

  1. I followed the wiki step by step multiple times on different fresh RPi setups but ended up pointing towards the toolchain explicitly in my IDE. I cannot recall what was wrong in detail but I will redo it as soon as I get the C++20 confusion sorted out. Then I will report if I have found the cause,
abhiTronix commented 3 years ago

@MartinMajewski Try specifying -std=c++20 -fmodules-ts instead.

abhiTronix commented 3 years ago

@MartinMajewski Yes, you additionally need -std=c++20 command-line parameter to enable C++20 support. More information here: https://gcc.gnu.org/projects/cxx-status.html

MartinMajewski commented 3 years ago

@abhiTronix Same:

pi@devpi:~/Downloads/native-pi-gcc-10.2.0-64/bin $ ./g++-10.2.0 -std=c++20 -fmodules-ts
g++-10.2.0: error: unrecognized command-line option ‘-fmodules-ts’

I tried with -std=c++20 before and this option is recognized but -fmodules-ts is not.

I read die cxx-status page before. Slowly, I begin to thing I'm stupid...

abhiTronix commented 3 years ago

Are symbolic links present:

 sudo ln -sf /usr/include/aarch64-linux-gnu/asm/* /usr/include/asm/
 sudo ln -sf /usr/include/aarch64-linux-gnu/gnu/* /usr/include/gnu/
 sudo ln -sf /usr/include/aarch64-linux-gnu/bits/* /usr/include/bits/
 sudo ln -sf /usr/include/aarch64-linux-gnu/sys/* /usr/include/sys/
 sudo ln -sf /usr/include/aarch64-linux-gnu/openssl/* /usr/include/openssl/
 sudo ln -sf /usr/lib/aarch64-linux-gnu/crtn.o /usr/lib/crtn.o
 sudo ln -sf /usr/lib/aarch64-linux-gnu/crt1.o /usr/lib/crt1.o
 sudo ln -sf /usr/lib/aarch64-linux-gnu/crti.o /usr/lib/crti.o
abhiTronix commented 3 years ago

@MartinMajewski Can you also try -std=c++2a instead of -std=c++20?

abhiTronix commented 3 years ago

Or even -std=gnu++20? I don't have pi4 or even Raspbian 64-bit installed to test it directly so this just speculations.

MartinMajewski commented 3 years ago

@abhiTronix

-std=c++2a produces the same result

Question about the symbolic links. The target is the first parameter, right? So this would mean to have the downloaded package copied into /usr/lib/... and /usr/include/... respectively?! But we do not do anything like this in the Temporary Installation section. So where do the files come from?

MartinMajewski commented 3 years ago 
pi@devpi:~/Downloads/native-pi-gcc-10.2.0-64/bin $ ./g++-10.2.0 -std=gnu++20 -fmodules-ts
g++-10.2.0: error: unrecognized command-line option ‘-fmodules-ts’
pi@devpi:~/Downloads/native-pi-gcc-10.2.0-64/bin $ ./aarch64-linux-gnu-g++-10.2.0 -std=gnu++20 -fmodules-ts
aarch64-linux-gnu-g++-10.2.0: error: unrecognized command-line option ‘-fmodules-ts’
abhiTronix commented 3 years ago

@MartinMajewski What's the output of command ./g++-10.2.0 -v --help 2> /dev/null | sed -n '/^ *-std=\([^<][^ ]\+\).*/ {s//\1/p}'

MartinMajewski commented 3 years ago 
pi@devpi:~/Downloads/native-pi-gcc-10.2.0-64/bin $ ./g++-10.2.0 -v --help 2> /dev/null | sed -n '/^ *-std=\([^<][^ ]\+\).*/ {s//\1/p}'
f2003
f2008
f2008ts
f2018
f95
gnu
legacy
c++03
c++98.
c++0x
c++11.
c++11
c++14
c++17
c++1y
c++14.
c++1z
c++17.
c++20
c++2a.
c++2a
c++98
c11
c17
c18
c1x
c11.
c2x
c89
c90.
c90
c99
c9x
c99.
gnu++03
gnu++0x
gnu++11.
gnu++11
gnu++14
gnu++17
gnu++1y
gnu++14.
gnu++1z
gnu++17.
gnu++20
gnu++2a
gnu++98
gnu11
gnu17
gnu18
gnu1x
gnu11.
gnu2x
gnu89
gnu90
gnu99
gnu9x
gnu99.
iso9899:1990
c90.
iso9899:199409
iso9899:1999
c99.
iso9899:199x
iso9899:2011
c11.
iso9899:2017
iso9899:2018
abhiTronix commented 3 years ago

@MartinMajewski means c++20 is present.

abhiTronix commented 3 years ago

@MartinMajewski can you test this on 32bit Raspberry Pi os? Can it problem with arm64/aarch64 only?

MartinMajewski commented 3 years ago

I have to be afk for a while now. Later, I will setup a second image with a 32bit Raspbian OS, retry, and report.

Thank you so much for now! Have a great time!

abhiTronix commented 3 years ago

@MartinMajewski Also try other toolchains other than repository too, and let me know if you find something weird. Thank you and goodluck.

MartinMajewski commented 3 years ago

other toolchains other than repository too

Which other toolchains do you refer to?

abhiTronix commented 3 years ago

@MartinMajewski https://wiki.musl-libc.org/getting-started.html uses musl instead of glibc.

Linaro: https://releases.linaro.org/components/toolchain/binaries/latest-7/aarch64-linux-gnu/

MartinMajewski commented 3 years ago

Okay, I'm back but with bad news:

pi@devpi32:~/development/toolchains/gcc/gcc_10_2_0_2/bin $ ./g++-10.2.0 -std=c++2a -fmodules-ts
g++-10.2.0: error: unrecognized command-line option ‘-fmodules-ts’

Freshly installed Rasperry OS Buster 32Bit, same issue.

Btw.:

sudo ln -sf /usr/include/arm-linux-gnueabihf/asm/* /usr/include/asm
 sudo ln -sf /usr/include/arm-linux-gnueabihf/gnu/* /usr/include/gnu
 sudo ln -sf /usr/include/arm-linux-gnueabihf/bits/* /usr/include/bits
 sudo ln -sf /usr/include/arm-linux-gnueabihf/sys/* /usr/include/sys
 sudo ln -sf /usr/include/arm-linux-gnueabihf/openssl/* /usr/include/openssl

This does not work! One has to remove /* to symlink a folder!

MartinMajewski commented 3 years ago 
pi@devpi32:~/development/toolchains/gcc/gcc_10_2_0_2/bin $ ./g++-10.2.0 -v --help 2> /dev/null | sed -n '/^ *-std=\([^<][^ ]\+\).*/ {s//\1/p}'
f2003
f2008
f2008ts
f2018
f95
gnu
legacy
c++03
c++0x
c++11
c++14
c++17
c++1y
c++1z
c++20
c++2a
c++98
c11
c17
c18
c1x
c2x
c89
c90
c99
c9x
gnu++03
gnu++0x
gnu++11
gnu++14
gnu++17
gnu++1y
gnu++1z
gnu++20
gnu++2a
gnu++98
gnu11
gnu17
gnu18
gnu1x
gnu2x
gnu89
gnu90
gnu99
gnu9x
iso9899:1990
iso9899:199409
iso9899:1999
iso9899:199x
iso9899:2011
iso9899:2017
iso9899:2018
MartinMajewski commented 3 years ago

Building the toolchain for 32bit, RPi 3+, Buster now myself.

Have you tried these steps yourself for 10.2.0? I mean, even without any symlinks set, just pure out of the downloaded GCC bin directory g++ should be able to consume this option!

MartinMajewski commented 3 years ago

Seems to be a widely spread issue:

pi@devpi32:~/development/toolchains/arm-linux-musleabihf-native/bin $ ./g++ --version
g++ (GCC) 10.2.1 20210116
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.

pi@devpi32:~/development/toolchains/arm-linux-musleabihf-native/bin $ ./g++ -std=c++2a -fmodules-ts
g++: error: unrecognized command-line option ‘-fmodules-ts’

Something is absolutely not in sync with what GNU GCC is claiming... :-/

abhiTronix commented 3 years ago

Btw.:

sudo ln -sf /usr/include/arm-linux-gnueabihf/asm/ /usr/include/asm sudo ln -sf /usr/include/arm-linux-gnueabihf/gnu/ /usr/include/gnu sudo ln -sf /usr/include/arm-linux-gnueabihf/bits/ /usr/include/bits sudo ln -sf /usr/include/arm-linux-gnueabihf/sys/ /usr/include/sys sudo ln -sf /usr/include/arm-linux-gnueabihf/openssl/ /usr/include/openssl This does not work! One has to remove / to symlink a folder!

@MartinMajewski Ok, I'll check it. Thanks.

abhiTronix commented 3 years ago

Seems to be a widely spread issue:

pi@devpi32:~/development/toolchains/arm-linux-musleabihf-native/bin $ ./g++ --version g++ (GCC) 10.2.1 20210116 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.

pi@devpi32:~/development/toolchains/arm-linux-musleabihf-native/bin $ ./g++ -std=c++2a -fmodules-ts g++: error: unrecognized command-line option ‘-fmodules-ts’ Something is absolutely not in sync with what GNU GCC is claiming... :-/

@MartinMajewski C++20 Support in GCC is still experimental and I'm guessing it hasn't been ported to ARM architecture yet. I'm not sure but you can raise a issue and ask their developers directly: https://gcc.gnu.org/bugs/

abhiTronix commented 3 years ago

@MartinMajewski I was right, here's a similar issue: https://stackoverflow.com/questions/58960695/c20-modules-in-arm-none-eabi-g

My advise is to wait for stable release. 😕

MartinMajewski commented 3 years ago

But this is from 2019... with release 10.2 most of the features are implemented. 🤔 I don't see a reason for a language feature being platform dependent. But maybe I'm wrong.

I'm compiling now directly from the original sources. We'll have to wait and see.

Moreover, I will try to get my hands on cross compilers that work on Mac but compile for Pi. Haven't tested this yet. I'll report as soon as new insights become available.

Best wishes, Martin