Build error in dockcross/linux-arm64 Docker

[Sundar Palani]

I have the following error while building inside dockcross/linux-arm64 docker running on my macOS x86-64.

/bin/bash ./libtool  --tag=CXX   --mode=link /usr/xcc/aarch64-unknown-linux-gnueabi/bin/aarch64-unknown-linux-gnueabi-g++ -I./src -I./src -DKJ_HEADER_WARNINGS -DCAPNP_HEADER_WARNINGS -DCAPNP_INCLUDE_DIR='"/usr/local/include"' -pthread -O2 -DNDEBUG -pthread -release 0.9-dev -no-undefined  -o libcapnp-json.la -rpath /usr/local/lib src/capnp/compat/json.lo src/capnp/compat/json.capnp.lo libcapnp.la libkj.la -lpthread -lpthread

libtool: link: /usr/xcc/aarch64-unknown-linux-gnueabi/bin/aarch64-unknown-linux-gnueabi-ar cru .libs/libcapnp-json.a  src/capnp/compat/json.o src/capnp/compat/json.capnp.o

libtool: link: ranlib .libs/libcapnp-json.a

libtool: link: ( cd ".libs" && rm -f "libcapnp-json.la" && ln -s "../libcapnp-json.la" "libcapnp-json.la" )

/bin/bash ./libtool  --tag=CXX   --mode=link /usr/xcc/aarch64-unknown-linux-gnueabi/bin/aarch64-unknown-linux-gnueabi-g++ -I./src -I./src -DKJ_HEADER_WARNINGS -DCAPNP_HEADER_WARNINGS -DCAPNP_INCLUDE_DIR='"/usr/local/include"' -pthread -O2 -DNDEBUG -pthread -pthread  -o capnp src/capnp/compiler/module-loader.o src/capnp/compiler/capnp.o libcapnpc.la libcapnp-json.la libcapnp.la libkj.la -lpthread -lpthread

libtool: link: /usr/xcc/aarch64-unknown-linux-gnueabi/bin/aarch64-unknown-linux-gnueabi-g++ -I./src -I./src -DKJ_HEADER_WARNINGS -DCAPNP_HEADER_WARNINGS -DCAPNP_INCLUDE_DIR=\"/usr/local/include\" -pthread -O2 -DNDEBUG -pthread -pthread -o capnp src/capnp/compiler/module-loader.o src/capnp/compiler/capnp.o  ./.libs/libcapnpc.a ./.libs/libcapnp-json.a /root/capnproto/c++/.libs/libcapnp.a ./.libs/libcapnp.a /root/capnproto/c++/.libs/libkj.a ./.libs/libkj.a -lpthread -pthread

./capnp compile --src-prefix=./src -o./capnpc-c++:src -I./src $(for FILE in src/capnp/test.capnp src/capnp/test-import.capnp src/capnp/test-import2.capnp src/capnp/compat/json-test.capnp; do echo ./$FILE; done)

./capnp compile: --src-prefix=./src: no such directory

Try './capnp compile --help' for more information.

Makefile:3801: recipe for target 'test_capnpc_middleman' failed

make: *** [test_capnpc_middleman] Error 1

Has anyone seen this error ? Any thoughts on how to solve this ?

PS: I was able to successfully compile this on my mac as well as aarch64 native machine (Jetson Nano).

[Kenton Varda]

Hi Sundar,

Can you tell us the set of commands that led to this? I.e. what was your command-line for `configure` and `make`? And what directory did you run them in, relative to the source directory?

-Kenton

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[Kenton Varda]

Hi Sundar,

Note that the step that is failing is when the build tries to invoke the capnp binary that it just built -- so it would be invoking an aarch64 binary.

Does this environment use qemu-user to emulate aarch64? I've noticed in the past that qemu-user has a lot of bugs emulating certain syscalls, including openat() which capnp uses for all filesystem access. The error message is pretty nonsensical (./src clearly exists), so my guess is this is a buggy qemu situation.

To avoid qemu problems when cross-compiling, I recommend compiling and installing cap'n proto for the host system first. Then, use `./configure --with-external-capnp`. This will use the installed capnp binary instead of using the one built in-tree.

If you don't want to install capnp on the host, you can use the environment variables CAPNP and CAPNPC_CXX to point at the `capnp` and `capnpc-c++` binaries located in some other location (together with `--with-external-capnp`).

-Kenton

On Sun, Nov 15, 2020 at 11:18 PM Sundar Palani <sundara...@gmail.com> wrote:

Hi Kenton - Thanks for the reply.

Here are the steps I did:

1. cd /root

2. curl -O https://capnproto.org/capnproto-c++-0.8.0.tar.gz

3. cd capnproto-c++-0.8.0

4. ./configure (Also tried these options for configure, same behaviour: --host aarch64-linux-gnu --build x86_64-linux-gnu --enable-static --disable-shared LIBS="-lrt -lpthread -lgcc -lsupc++ -lstdc++")

5. make -j4 check -- failed at this step.

Attached the log file.

Regards,
Sundar

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SundaraGanesh Palani

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