Re: [capnproto] Build error on Raspbian, "undefined reference to `__atomic_load_8'"

['Kenton Varda' via Cap'n Proto]

Hi Jens,

I answered on your github issue:
https://github.com/capnproto/capnproto/issues/1448#issuecomment-1093275165

-Kenton

On Fri, Apr 8, 2022 at 2:30 PM Jens Alfke  wrote:

> I'm building CapnP 0.9.1 from source on a new Raspberry Pi 4 running
> Raspbian (because apt only has version 0.7.)
>
> curl -O https://capnproto.org/capnproto-c++-0.9.1.tar.gz
> tar zxf capnproto-c++-0.9.1.tar.gz
> cd capnproto-c++-0.9.1
> ./configure
> make -j6 check
> sudo make install
>
>
> Everything went fine until the final "sudo make install" step:
>
> ...
> libtool: link: g++ -I./src -I./src -DKJ_HEADER_WARNINGS
> -DCAPNP_HEADER_WARNINGS -DCAPNP_INCLUDE_DIR=\"/usr/local/include\" -pthread
> -O2 -DNDEBUG -pthread -DKJ_HAS_ZLIB -pthread -o .libs/capnp
> src/capnp/compiler/module-loader.o
> src/capnp/compiler/capnp.o  ./.libs/libcapnpc.so ./.libs/libcapnp-json.so
> ./.libs/libcapnp.so ./.libs/libkj.so -lpthread -pthread
> /usr/bin/ld: ./.libs/libcapnp.so: undefined reference to `__atomic_load_8'
> /usr/bin/ld: ./.libs/libcapnp.so: undefined reference to `__atomic_store_8’
>
> I’m guessing the missing symbols are CPU intrinsics for 64-bit atomic
> operations. Could this have something to do with the fact that Raspbian is
> still running in 32-bit on a 64-bit CPU?
>
> —Jens
>
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[capnproto] Build error on Raspbian, "undefined reference to `__atomic_load_8'"

[Jens Alfke]

I'm building CapnP 0.9.1 from source on a new Raspberry Pi 4 running Raspbian 
(because apt only has version 0.7.) 

curl -O https://capnproto.org/capnproto-c++-0.9.1.tar.gz
tar zxf capnproto-c++-0.9.1.tar.gz
cd capnproto-c++-0.9.1
./configure
make -j6 check
sudo make install

Everything went fine until the final "sudo make install" step:

...
libtool: link: g++ -I./src -I./src -DKJ_HEADER_WARNINGS -DCAPNP_HEADER_WARNINGS 
-DCAPNP_INCLUDE_DIR=\"/usr/local/include\" -pthread -O2 -DNDEBUG -pthread 
-DKJ_HAS_ZLIB -pthread -o .libs/capnp src/capnp/compiler/module-loader.o 
src/capnp/compiler/capnp.o  ./.libs/libcapnpc.so ./.libs/libcapnp-json.so 
./.libs/libcapnp.so ./.libs/libkj.so -lpthread -pthread
/usr/bin/ld: ./.libs/libcapnp.so: undefined reference to `__atomic_load_8'
/usr/bin/ld: ./.libs/libcapnp.so: undefined reference to `__atomic_store_8’

I’m guessing the missing symbols are CPU intrinsics for 64-bit atomic 
operations. Could this have something to do with the fact that Raspbian is 
still running in 32-bit on a 64-bit CPU?

—Jens

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