cross-compilation for Linux from OSX

[Sergey Kojin]

I build empty app and try to complile it for ubuntu from OSX 10.9.5

crystal build --cross-compile "Linux x86_64"  --target "x86_64-pc-linux-gnu" src/crystalhello.cr

cc crystalhello.o -o crystalhello  -rdynamic  -levent -lrt -lpcl -lpcre -lgc -lpthread -ldl

It fail, call cc -v give error

Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)

Target: x86_64-apple-darwin13.4.0

Thread model: posix

 "/Library/Developer/CommandLineTools/usr/bin/ld" -demangle -export_dynamic -dynamic -arch x86_64 -macosx_version_min 10.9.0 -o crystalhello crystalhello.o -levent -lrt -lpcl -lpcre -lgc -lpthread -ldl -L. -L/usr/local/lib -lSystem /Library/Developer/CommandLineTools/usr/bin/../lib/clang/6.0/lib/darwin/libclang_rt.osx.a

ld: library not found for -lrt

clang: error: linker command failed with exit code 1 (use -v to see invocation)

What I do wrong?

[Ary Borenszweig]

Are you running the "cc" command in ubuntu or mac osx? 

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[Sergey Kojin]

On OSX

[Ary Borenszweig]

That's why it doesn't work. If you follow the instructions at http://crystal-lang.org/docs/syntax_and_semantics/cross-compilation.html it says you need to copy the .o to the target system of the cross compilation (ubuntu in your case) and then run that cc command there.

But there's already a compiler for ubuntu, so you could easily compile a program in ubuntu, no need to cross compile.

On Sun, Dec 13, 2015 at 6:04 AM, Sergey Kojin <sergey...@gmail.com> wrote:

On OSX

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[Tim Uckun]

Just out of curiosity Is the compilation static? 

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[Sergey Kojin]

Thanks, that helps, I just expected some like GO crosscompliation.

Now I stick with error on ubuntu 14.04

main_module:(.text+0x72bb): undefined reference to `GC_get_push_other_roots'

воскресенье, 13 декабря 2015 г., 21:24:03 UTC+3 пользователь aborenszweig написал:

[Ary Borenszweig]

You need boehm GC 7.4. But why are you cross compiling to Ubuntu if there's a package for it already?

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[sergey.kojin]

I not compile crystal, I compile my project.

понедельник, 14 декабря 2015 г. в 18:28, Ary Borenszweig написал:

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[Sergey Kojin]

Everyone thanks, for help. I just used docker to build for ubuntu.

[Tim Uckun]

Just out of curiosity.

What is the preferred way to deploy Crystal apps? Do you ship the source and compile on the target as a part of the deployment process or do you rely on cross compilation?

Also do you guys think it will ever be possible to statically compile your app so you can just copy a binary and be done without having to worry about what's installed on the host.

Thanks.

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[Ary Borenszweig]

Right now the best thing to do is to compile on the target machine.

I think eventually fully cross compiling an app should be possible, but right now it's really low priority for us.

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