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

[Kenton Varda]

Hi Jens,

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

-Kenton

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