nad2bin being run while building prevents cross compiling

[3nids]

I am trying to compile Proj 5.2 for Android and I am facing this error:

It tries to run nad2bin on the environnement, but nad2bin has been compiled for Android.

What is the proper approach?
I am using autotools, but I failed to disable building nad2bin (is it possible?). But is it the right approach?

[3nids]

and if I try with cmake, here is the issue I have

although I tried to disable the tests:
cmake -DCMAKE_INSTALL_PREFIX:PATH=$STAGE_PATH -DBUILD_GTEST=OFF -DPROJ_TESTS=OFF -DBUILD_NAD2BIN=OFF $BUILD_proj

[kbevers]

I haven't got an answer to your question. But I have a counter-question to my fellow PROJ developers: Do we still have a need for nad2bin? We have moved all grids, except null, to https://github.com/OSGeo/proj-datumgrid where we manage the grids in binary form. I can't see why we would stille keep it around except for building null from null.lla but we can get around that by just distributing the null grid in binary form.

@rouault @sebastic thoughts?

[sebastic]

nad2bin is required to convert the .lla sources, this is part of the proj-datumgrid build process. I strongly object to keeping only the binaries and removing nad2bin. The .lla files are the preferred form for modification.

The Debian package for PROJ 5.2 builds fine on arm*, including tests.

This issue doesn't have enough information to determine what causes the issue. It may be a cross-compilation issue.

[kbevers]

nad2bin is required to convert the .lla sources, this is part of the proj-datumgrid build process.

We can move nad2bin to proj-datumgrid. I feel like it has served it's purpose as part of the main PROJ package now that all the *.lla files have moved elsewhere.

[3nids]

@sebastic I'd be happy to provide more info, what would you need? Or do you have a reference to a script that build on arm? cheers!

[rouault]

@sebastic It compiles on ARM in the Debian case. Not cross-compilation ?

I can indeed see that nad/Makefile.am assumes to be able to run the nad2bin executable that it has compiled, which can be problematic with cross-compilation indeed. But I don't see why it would have worked better in 4.9 as you mentionned in your email @3nids . Maybe you need to tweak nad/Makfile.am to run a nad2bin executable of the architecture on which you build on.

[sebastic]

We can move nad2bin to proj-datumgrid. I feel like it has served it's purpose as part of the main PROJ package now that all the *.lla files have moved elsewhere.

In my opinion it belongs in the PROJ source tree. No need to complicate the proj-datumgrid project by having to build C programs.

@sebastic I'd be happy to provide more info, what would you need?

Details about your build environment & full build logs for starters.

Or do you have a reference to a script that build on arm?

See the Debian package sources.

It compiles on ARM in the Debian case. Not cross-compilation ?

On, build and target architectures are the same. There are arm64 build daemons that also build armhf packages.

[3nids]

Maybe asking this differently, is there a way to use the cmake option BUILD_NAD2BIN=OFF with autotools?
I tried --without-nad2bin and --disable-nad2bin without success.

[rouault]

Maybe asking this differently, is there a way to use the cmake option BUILD_NAD2BIN=OFF with autotools?
I tried --without-nad2bin and --disable-nad2bin without success.

No, you'll have to hack into nad/Makefile.am to disable the use of nad2bin

[3nids]

Thanks @rouault
I gave it a try but changing the Makefile requires having automake-1.16 and I am running this on xenial where it is not available....I might wait for this to land in master! Thanks again

[rouault]

I gave it a try but changing the Makefile requires having automake-1.16 and I am running this on xenial where it is not available...

I'm running Xenial too. No problem for me with hacking Makefile.am. You probably just need to run ./autogen.sh

[ndarilek]

Any chance this might land in a release soon? I just encountered it myself under the exact same circumstances--attempting to cross-compile from Ubuntu to Android.

Thanks!

[QuLogic]

See #1267.