I didn't know about ldd, until :aceman told me about it today. Instead of 4 minutes, linking takes only 15 seconds on my system.

Is there a reason this isn't enabled automatically on platforms that support it?

(In reply to Kai Engert (:kaie:) from comment #2)

I didn't know about ldd, until :aceman told me about it today. Instead of 4 minutes, linking takes only 15 seconds on my system.

Is there a reason this isn't enabled automatically on platforms that support it?

It is supposed to be the default for developer builds, what does your mozconfig look like?

With this config, ld is used (not lld).

What does your $OBJDIR/config.log and $OBJDIR/config.status look like?

(In reply to Nathan Froyd [:froydnj] from comment #5)

What does your $OBJDIR/config.log and $OBJDIR/config.status look like?

attached

Hm, unfortunately the log doesn't contain enough information to debug just by looking at it. What does $HOME/.mozbuild/clang/bin/clang -std=gnu99 -Wl,--version -fuse-ld=lld say? That is what we should be running when we get here:

https://searchfox.org/mozilla-central/source/build/moz.configure/toolchain.configure#2014-2023

and apparently that check is failing.

$ $HOME/.mozbuild/clang/bin/clang -std=gnu99 -Wl,--version -fuse-ld=lld
LLD 8.0.0 (compatible with GNU linkers)

How can I print to the terminal from inside that script?
It seems to be python, but trying to use "print" results in errors.

It seems try_linker('lld') isn't executed.

(In reply to Kai Engert (:kaie:) from comment #10)

How can I print to the terminal from inside that script?
It seems to be python, but trying to use "print" results in errors.

It seems try_linker('lld') isn't executed.

You should be able to call log.info(...) to print.

Thanks.

The reason try_linker('lld') isn't reached: developer_options is false.

(In reply to Kai Engert (:kaie:) from comment #12)

Thanks.

The reason try_linker('lld') isn't reached: developer_options is false.

Are you compiling a beta/release version of Thunderbird?

My local build script, which I've been updating since many years, indeed contains two related symbol definitions:

export MOZILLA_OFFICIAL=1
export BUILD_OFFICIAL=1

If I remove those, then I get lld...

I don't remember why I had set those flags in the past, it was probably necessary for some local testing.

Out of topic but maybe we should show a warning at the end of the build
like
"please note that you are building an official version of Firefox. Options might be different".