llvm dev - Jan 2016 - [cfe-dev] Proposal: Enable BUILD_SHARED_LIBS=ON by default for debug build.

On Thu, Jan 28, 2016 at 3:06 PM, Jonathan Roelofs <jonathan at
codesourcery.com
> wrote:
>
>
> On 1/28/16 4:00 PM, Yin Ma via cfe-dev wrote:
>
>> Hi David,
>>
>> I assume you have a powerful machine. Our drive space is on network
>> mounted
>>
>> machined by IT department. The machine is default Ubuntu setup with 8
>> cores.
>>
>
> It helps a lot to build on a non-NFS scratch disk.  Is your /tmp network
> mounted too? If not, I'd suggest building there.
>
Yeah, building on a network attached storage would be pretty painful, I
imagine.

You can of course use a shared build yourself, it may be better for your
use/scenarios of course - I'm just pointing out that there's lots of us
for
which it isn't the best option, enough so that I wouldn't be confident
about changing the default.
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Hi David,

 

It is O.K. I just hope BUILD_SHARED_LIBS=ON is tested when a patch is 

merged. Yesterday, I found the tip failed to build with ON. Today, tip is 

O.K to build in shared linking.

 

Yin 

 

From: David Blaikie [mailto:dblaikie at gmail.com] 
Sent: Thursday, January 28, 2016 3:50 PM
To: Jonathan Roelofs
Cc: Yin Ma; llvm-dev; cfe-dev
Subject: Re: [cfe-dev] Proposal: Enable BUILD_SHARED_LIBS=ON by default for
debug build.

 

 

 

On Thu, Jan 28, 2016 at 3:06 PM, Jonathan Roelofs <jonathan at
codesourcery.com <mailto:jonathan at codesourcery.com> > wrote:



On 1/28/16 4:00 PM, Yin Ma via cfe-dev wrote:

Hi David,

I assume you have a powerful machine. Our drive space is on network mounted

machined by IT department. The machine is default Ubuntu setup with 8
cores.


It helps a lot to build on a non-NFS scratch disk.  Is your /tmp network mounted
too? If not, I'd suggest building there.

 

Yeah, building on a network attached storage would be pretty painful, I imagine.

You can of course use a shared build yourself, it may be better for your
use/scenarios of course - I'm just pointing out that there's lots of us
for which it isn't the best option, enough so that I wouldn't be
confident about changing the default.

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On Thu, Jan 28, 2016 at 3:58 PM, Yin Ma <yinma at codeaurora.org> wrote:
> Hi David,
>
>
>
> It is O.K. I just hope BUILD_SHARED_LIBS=ON is tested when a patch is
>
> merged. Yesterday, I found the tip failed to build with ON. Today, tip is
>
> O.K to build in shared linking.
>
I'm not sure we have (m)any buildbots running with a shared link on. Though
we do tend to catch any dependency problems like the one you saw soon-ish
(within a day or two) & patches are always welcome for that sort of thing
(as for other cleanup on configurations that are less frequently used).

- Dave

>
>
> Yin
>
>
>
> *From:* David Blaikie [mailto:dblaikie at gmail.com]
> *Sent:* Thursday, January 28, 2016 3:50 PM
> *To:* Jonathan Roelofs
> *Cc:* Yin Ma; llvm-dev; cfe-dev
> *Subject:* Re: [cfe-dev] Proposal: Enable BUILD_SHARED_LIBS=ON by default
> for debug build.
>
>
>
>
>
>
>
> On Thu, Jan 28, 2016 at 3:06 PM, Jonathan Roelofs <
> jonathan at codesourcery.com> wrote:
>
>
>
> On 1/28/16 4:00 PM, Yin Ma via cfe-dev wrote:
>
> Hi David,
>
> I assume you have a powerful machine. Our drive space is on network mounted
>
> machined by IT department. The machine is default Ubuntu setup with 8
> cores.
>
>
> It helps a lot to build on a non-NFS scratch disk.  Is your /tmp network
> mounted too? If not, I'd suggest building there.
>
>
>
> Yeah, building on a network attached storage would be pretty painful, I
> imagine.
>
> You can of course use a shared build yourself, it may be better for your
> use/scenarios of course - I'm just pointing out that there's lots
of us for
> which it isn't the best option, enough so that I wouldn't be
confident
> about changing the default.
>
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Hi Yin,

I second David's words. I use shared libs myself on debug builds, but
static builds with gold on a local disk is pretty feasible. Before I
used gold, I had to have 16GB of RAM on my laptop, now I need less
than 8GB for static builds.


On 28 January 2016 at 23:58, Yin Ma via cfe-dev <cfe-dev at
lists.llvm.org> wrote:
> It is O.K. I just hope BUILD_SHARED_LIBS=ON is tested when a patch is
> merged. Yesterday, I found the tip failed to build with ON. Today, tip is
> O.K to build in shared linking.
This is a different matter, and as David said, one that may not be
*that* critical, given to the number of people that use shared libs on
debug builds.

Chances are that ToT is ok now because someone fixed whatever the bug
was, and not because of sheer luck. Don't worry too much about it.

I see no reason to turn shared libs on by default on debug builds,
given that it's just one command line option in CMake. Whatever the
default state of that flag is, some people will have to have it,
others won't. If you change the default, you'll force *everyone* to
change their flags for no reason.

cheers,
--renato

PS: Life is short, don't build stuff over NFS. :)

Hi,

I enabled BUILD_SHARED_LIBS=ON for the llvm-mips-linux builder when I switched
it over to cmake.

From: cfe-dev [mailto:cfe-dev-bounces at lists.llvm.org] On Behalf Of Yin Ma via
cfe-dev
Sent: 28 January 2016 23:59
To: 'David Blaikie'; 'Jonathan Roelofs'
Cc: 'llvm-dev'; 'cfe-dev'
Subject: Re: [cfe-dev] Proposal: Enable BUILD_SHARED_LIBS=ON by default for
debug build.

Hi David,

It is O.K. I just hope BUILD_SHARED_LIBS=ON is tested when a patch is
merged. Yesterday, I found the tip failed to build with ON. Today, tip is
O.K to build in shared linking.

Yin

From: David Blaikie [mailto:dblaikie at gmail.com]
Sent: Thursday, January 28, 2016 3:50 PM
To: Jonathan Roelofs
Cc: Yin Ma; llvm-dev; cfe-dev
Subject: Re: [cfe-dev] Proposal: Enable BUILD_SHARED_LIBS=ON by default for
debug build.



On Thu, Jan 28, 2016 at 3:06 PM, Jonathan Roelofs <jonathan at
codesourcery.com<mailto:jonathan at codesourcery.com>> wrote:


On 1/28/16 4:00 PM, Yin Ma via cfe-dev wrote:
Hi David,

I assume you have a powerful machine. Our drive space is on network mounted

machined by IT department. The machine is default Ubuntu setup with 8
cores.

It helps a lot to build on a non-NFS scratch disk.  Is your /tmp network mounted
too? If not, I'd suggest building there.

Yeah, building on a network attached storage would be pretty painful, I imagine.

You can of course use a shared build yourself, it may be better for your
use/scenarios of course - I'm just pointing out that there's lots of us
for which it isn't the best option, enough so that I wouldn't be
confident about changing the default.
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