build x86 on an x64 machine

[Pentium4User]

Hello!

Due to performance issues (Pentium M) I want to build the x86 Linux PM on my normal Linux machine (x64).
I removed the _BUILD_64=1 line in mozconfig, but after the build and package command, the package still has x86_64 in its name.

Is there a way to build x86 PM on an x64 system or do I need to build it on an x86 OS?

--
kind regards
Marco

[Moonchild]

You'll have to cross-compile, which is normally done by setting the --target and --host ac options accordingly.
--host is the architecture you're building on, and --target is the architecture you are building for.
e.g.:

Code: Select all

  ac_add_options --target=i686-linux-gnu
  ac_add_options --host=x86_64-linux-gnu

(going by memory here, you may need other expressions for them).
the --host might possibly not even be necessary.

It's been a very long time since I did cross-compilation and I don't know if it's even fully working in our tree at the moment. I'll defer to the Linux gurus in the community.

[vannilla]

Cross-compilation with Autoconf changed between 2.13 and the version immediately after, so the exact options have to align with 2.13's way of doing things, which I don't remember and anyway can't test.
It's probably listed somewhere in the documentation of that specific version of Autoconf.

[Basilisk-Dev]

Here's the mozconfig I use for building Basilisk for 32-bit x86 Linux on a 64-bit x86 Linux host: https://repo.palemoon.org/Basilisk-Dev/ ... .mozconfig

The important bits are:

Code: Select all

# Clear this if not a 64bit build
_BUILD_64=


ac_add_options --target=i686-unknown-linux-gnu
ac_add_options --with-arch=i686


# Processor architecture specific build options
if [ -n "$_BUILD_64" ]; then
  ac_add_options --x-libraries=/usr/lib64
else
  ac_add_options --x-libraries=/usr/lib
  export PKG_CONFIG_PATH=/usr/lib/pkgconfig
fi