How to cross compile x86_64 program under ubuntu Arm64?

[rarnu]

I have installed ubuntu arm64 on Raspberry Pi, and now I want to cross compile x86_64 programs but there is no cross compiler.

I tried to compile it myself with the steps:

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1. $ sudo apt install crossbuild-essential-amd64
2. $ cd /usr/bin
3. $ sudo ln -s x86_64-linux-gnu-as x86_64-linux-as
4. $ cd ~/Downloads/fpc-3.2.2
5. $ make clean crossall OVERRIDEVERSIONCHECK=1 TARGET_OS=linux CPU_TARGET=x86_64
6.  

and the error is:

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1. system.pp(490,1) Fatal: Internal error 2015030501
2. Fatal: Compilation aborted
3.  

I attached the full compile log for help.

How can I finish the compile?

[PascalDragon]

I have installed ubuntu arm64 on Raspberry Pi, and now I want to cross compile x86_64 programs but there is no cross compiler.

It is currently not possible to compile from a non-x86 CPU to a x86 CPU, because the later requires support for the 80-bit floating point type (aka Extended) which is not available for most others.