[chromium-dev] better landing of /src/third_party/llvm-build/Release+Asserts -> [win/mac/linux]

[Дмитрий Юдин]

I have successfully compiled mac and win builds from shared webrtc folder,
the only issue is a /src/third_party/llvm-build placement.
Currently, every platform compiles llvm into .../llvm-build/Release+Asserts folder
and one have to remove it or re-run /src/tools/clang/scripts/update.py script
to get proper executables in place.

Is it possible to land llvm into platform specific folder?

[Nico Weber]

Hi,

you should only need the host version of third_party/llvm-build to build
stuff for all platforms; clang is a "natural cross compiler". If you're on
a linux host, you can for example use the linux clang binary to produce
linux, mac, and windows executables.

Nico

[Дмитрий Юдин]

The thing is that I change the host system itself. The /src folder shared
across hosts (located on usb-drive). It works pretty well since, I can run gclient
sync, build, etc... but to enable it works I currently have to manage with
llvm executables since each host put them into .../Release+Assets folder.
Would it possible to have execs in .../Release+Assets/win, mac in
.../Release+Assets/mac, etc?

Post by Nico Weber
Hi,
you should only need the host version of third_party/llvm-build to build
stuff for all platforms; clang is a "natural cross compiler". If you're on
a linux host, you can for example use the linux clang binary to produce
linux, mac, and windows executables.
Nico

[Nico Weber]

Oh, I see :-)

Making this work would be nice, but many places make assumptions about
where the compiler lives, so changing it is somewhat involved, while your
use case is pretty rare. So I'd say making this work is nice to have, but
realistically unlikely to happen soon.

Post by Дмитрий Юдин
The thing is that I change the host system itself. The /src folder shared
across hosts (located on usb-drive). It works pretty well since, I can run gclient
sync, build, etc... but to enable it works I currently have to manage
with llvm executables since each host put them into .../Release+Assets
folder. Would it possible to have execs in .../Release+Assets/win, mac in
.../Release+Assets/mac, etc?

Post by Nico Weber
Hi,
you should only need the host version of third_party/llvm-build to build
stuff for all platforms; clang is a "natural cross compiler". If you're on
a linux host, you can for example use the linux clang binary to produce
linux, mac, and windows executables.
Nico

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[Daniel Bratell]

It might not be an unmanageable number of places that need to change for
it to work. clang needs to be downloaded into a separate folder, and then
you could set clang_base_path in gn to different paths on different
platforms. It would not be 100% automatic but might be easier than
reinstalling clang every time the usb stick is moved.

Nico, do you think that is worth trying?

/Daniel

Post by Nico Weber
Oh, I see :-)
Making this work would be nice, but many places make assumptions about
where the compiler lives, so changing it is somewhat involved, while
your >use case is pretty rare. So I'd say making this work is nice to
have, but realistically unlikely to happen soon.

Post by Дмитрий Юдин
The thing is that I change the host system itself. The /src folder
shared across hosts (located on usb-drive). It works pretty well since,
I can run >>gclient sync, build, etc... but to enable it works I
currently have to manage with llvm executables since each host put them
into .../>>Release+Assets folder. Would it possible to have execs in
.../Release+Assets/win, mac in .../Release+Assets/mac, etc?
среЎа, 21 МПября 2018 г., 16:03:21 UTC+3 пПльзПватель Nico Weber

Post by Nico Weber
Hi,
you should only need the host version of third_party/llvm-build to
build stuff for all platforms; clang is a "natural cross compiler". If
you're on a >>>linux host, you can for example use the linux clang
binary to produce linux, mac, and windows executables.
Nico

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[Nico Weber]

Post by Daniel Bratell
It might not be an unmanageable number of places that need to change for
it to work. clang needs to be downloaded into a separate folder, and then
you could set clang_base_path in gn to different paths on different
platforms. It would not be 100% automatic but might be easier than
reinstalling clang every time the usb stick is moved.

https://cs.chromium.org/search/?q=release%5C%2Basserts&sq=package:chromium&type=cs
– this is spread over several repositories and would need careful rollout.

Post by Daniel Bratell
Nico, do you think that is worth trying?

Given that's it's a bunch of subtle work with virtually upside, so as I
said I don't think doing this anytime soon is really worth it.

Post by Daniel Bratell
/Daniel
Oh, I see :-)
Making this work would be nice, but many places make assumptions about
where the compiler lives, so changing it is somewhat involved, while your
use case is pretty rare. So I'd say making this work is nice to have, but
realistically unlikely to happen soon.

Post by Дмитрий Юдин
The thing is that I change the host system itself. The /src folder
shared across hosts (located on usb-drive). It works pretty well since, I
can run gclient sync, build, etc... but to enable it works I currently
have to manage with llvm executables since each host put them into
.../Release+Assets folder. Would it possible to have execs in
.../Release+Assets/win, mac in .../Release+Assets/mac, etc?

Post by Nico Weber
Hi,
you should only need the host version of third_party/llvm-build to build
stuff for all platforms; clang is a "natural cross compiler". If you're on
a linux host, you can for example use the linux clang binary to produce
linux, mac, and windows executables.
Nico

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[Дмитрий Юдин]

set clang_base_path in gn ...

Thanks, I'll try to find out better workaround following your advice.


четверг, 22 МПября 2018 г., 0:47:00 UTC+3 пПльзПватель Daniel Bratell

It might not be an unmanageable number of places that need to change for
it to work. clang needs to be downloaded into a separate folder, and then
you could set clang_base_path in gn to different paths on different
platforms. It would not be 100% automatic but might be easier than
reinstalling clang every time the usb stick is moved.
Nico, do you think that is worth trying?
/Daniel
Oh, I see :-)
Making this work would be nice, but many places make assumptions about
where the compiler lives, so changing it is somewhat involved, while your
use case is pretty rare. So I'd say making this work is nice to have, but
realistically unlikely to happen soon.

Post by Дмитрий Юдин
The thing is that I change the host system itself. The /src folder
shared across hosts (located on usb-drive). It works pretty well since, I
can run gclient sync, build, etc... but to enable it works I currently
have to manage with llvm executables since each host put them into
.../Release+Assets folder. Would it possible to have execs in
.../Release+Assets/win, mac in .../Release+Assets/mac, etc?

Post by Nico Weber
Hi,
you should only need the host version of third_party/llvm-build to build
stuff for all platforms; clang is a "natural cross compiler". If you're on
a linux host, you can for example use the linux clang binary to produce
linux, mac, and windows executables.
Nico

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[Daniel Bratell]

Seems from Nico's response like it wouldn't work out of the box because
for instance clang plugins would be loaded from the "wrong" (original)
path. I've had such a setup for parallel clang toolchains but did not
notice that some binaries/files were used from the wrong path since they
worked anyway. You would not be that lucky.

/Daniel

Post by Дмитрий Юдин

set clang_base_path in gn ...

Thanks, I'll try to find out better workaround following your advice.
четверг, 22 МПября 2018 г., 0:47:00 UTC+3 пПльзПватель Daniel Bratell

It might not be an unmanageable number of places that need to change
for it to work. clang needs to be downloaded into a separate folder,
and >>then you could set clang_base_path in gn to different paths on
different platforms. It would not be 100% automatic but might be easier
than >>reinstalling clang every time the usb stick is moved.
Nico, do you think that is worth trying?
/Daniel

Post by Nico Weber
Oh, I see :-)
Making this work would be nice, but many places make assumptions about
where the compiler lives, so changing it is somewhat involved, while

Post by Дмитрий Юдин

Post by Nico Weber

your use case is pretty rare. So I'd say making this work is nice

to have, but realistically unlikely to happen soon.

Post by Дмитрий Юдин
The thing is that I change the host system itself. The /src folder
shared across hosts (located on usb-drive). It works pretty well
since, I can >>>>run gclient sync, build, etc... but to enable it
works I currently have to manage with llvm executables since each
host put them into >>>>.../Release+Assets folder. Would it possible
to have execs in .../Release+Assets/win, mac in
.../Release+Assets/>>>>mac, etc?
среЎа, 21 МПября 2018 г., 16:03:21 UTC+3 пПльзПватель Nico Weber

Post by Nico Weber
Hi,
you should only need the host version of third_party/llvm-build to
build stuff for all platforms; clang is a "natural cross compiler".
If you're >>>>>on a linux host, you can for example use the linux
clang binary to produce linux, mac, and windows executables.
Nico

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[Nico Weber]

Setting clang_base_path works. I'm just saying that if you want to make the
default toolchain location different on different hosts, lots of bot
configs will break unless you're careful.

Post by Daniel Bratell
Seems from Nico's response like it wouldn't work out of the box because
for instance clang plugins would be loaded from the "wrong" (original)
path. I've had such a setup for parallel clang toolchains but did not
notice that some binaries/files were used from the wrong path since they
worked anyway. You would not be that lucky.
/Daniel

set clang_base_path in gn ...

Thanks, I'll try to find out better workaround following your advice.
четверг, 22 МПября 2018 г., 0:47:00 UTC+3 пПльзПватель Daniel Bratell

It might not be an unmanageable number of places that need to change for
it to work. clang needs to be downloaded into a separate folder, and then
you could set clang_base_path in gn to different paths on different
platforms. It would not be 100% automatic but might be easier than
reinstalling clang every time the usb stick is moved.
Nico, do you think that is worth trying?
/Daniel
Oh, I see :-)
Making this work would be nice, but many places make assumptions about
where the compiler lives, so changing it is somewhat involved, while your
use case is pretty rare. So I'd say making this work is nice to have, but
realistically unlikely to happen soon.

Post by Дмитрий Юдин
The thing is that I change the host system itself. The /src folder
shared across hosts (located on usb-drive). It works pretty well since, I
can run gclient sync, build, etc... but to enable it works I currently
have to manage with llvm executables since each host put them into
.../Release+Assets folder. Would it possible to have execs in
.../Release+Assets/win, mac in .../Release+Assets/mac, etc?

Post by Nico Weber
Hi,
you should only need the host version of third_party/llvm-build to
build stuff for all platforms; clang is a "natural cross compiler". If
you're on a linux host, you can for example use the linux clang binary to
produce linux, mac, and windows executables.
Nico

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[Henrique Ferreiro]

Hi Nico,

Now that I read about this, are there any plans to make chrome/mac builds
from Linux, similarly as chrome/win builds are possible?

El miércoles, 21 de noviembre de 2018, 14:03:21 (UTC+1), Nico Weber

Post by Nico Weber
Hi,
you should only need the host version of third_party/llvm-build to build
stuff for all platforms; clang is a "natural cross compiler". If you're on
a linux host, you can for example use the linux clang binary to produce
linux, mac, and windows executables.
Nico

[Nico Weber]

There are no plans for that. I've poked at it some (
https://chromium-review.googlesource.com/c/chromium/src/+/1236713) but
there a bunch of hurdles left, both technical (ibtool, ld64, 
) and
non-technical.

On Wed, Nov 21, 2018 at 8:34 AM Henrique Ferreiro <

Post by Henrique Ferreiro
Hi Nico,
Now that I read about this, are there any plans to make chrome/mac builds
from Linux, similarly as chrome/win builds are possible?
El miércoles, 21 de noviembre de 2018, 14:03:21 (UTC+1), Nico Weber

Post by Nico Weber
Hi,
you should only need the host version of third_party/llvm-build to build
stuff for all platforms; clang is a "natural cross compiler". If you're on
a linux host, you can for example use the linux clang binary to produce
linux, mac, and windows executables.
Nico

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