Cross compiling v8 for armv7 on 64bit linux

[luca.li...@gmail.com]

I am building NodeJS for ARMv7 on a x86_64 linux machine. I noticed that torque is compiled for x86, though running a 64bit system. It is no problem for my desktop system where I can install a multilib libstc++, however this is a bit ugly for our build environment. So I wondered in general whether there is actual any requirement to build torque in 32bit, since it is a host tool anyway. Is this really required (maybe because I am cross compiling for 32bit ARM) or is it just a build system limitation?

[Jakob Kummerow]

I guess Torque just inherits the build settings: it is not the only host tool. The other (and older) tool is mksnapshot, which needs to match the bit-ness of the target, i.e. you need a 32-bit mksnapshot when you're building for a 32-bit target. 32-bit-x86 host tools and 32-bit-arm target is fine (that's what V8's built-in simulator is for), but since mksnapshot creates a heap snapshot which is then used on the target, the pointers in that heap must have the correct size.

TL;DR: yes, you'll need multilib when cross-compiling for a 32-bit target on a 64-bit host, but that's not because of Torque.

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[luca.li...@gmail.com]

Ok thanks for the quick response.

Am Donnerstag, 23. Mai 2019 18:23:14 UTC+2 schrieb Jakob Kummerow:

I guess Torque just inherits the build settings: it is not the only host tool. The other (and older) tool is mksnapshot, which needs to match the bit-ness of the target, i.e. you need a 32-bit mksnapshot when you're building for a 32-bit target. 32-bit-x86 host tools and 32-bit-arm target is fine (that's what V8's built-in simulator is for), but since mksnapshot creates a heap snapshot which is then used on the target, the pointers in that heap must have the correct size.

TL;DR: yes, you'll need multilib when cross-compiling for a 32-bit target on a 64-bit host, but that's not because of Torque.

On Thu, May 23, 2019 at 5:59 PM <luca.l...@gmail.com> wrote:

I am building NodeJS for ARMv7 on a x86_64 linux machine. I noticed that torque is compiled for x86, though running a 64bit system. It is no problem for my desktop system where I can install a multilib libstc++, however this is a bit ugly for our build environment. So I wondered in general whether there is actual any requirement to build torque in 32bit, since it is a host tool anyway. Is this really required (maybe because I am cross compiling for 32bit ARM) or is it just a build system limitation?

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