Re: [cmake-developers] Eclipse CDT Managed build

2017-01-26 Thread Ben Boeckel
On Thu, Jan 26, 2017 at 11:41:21 -0500, Paul Smith wrote:
> IMO the right place for managing relocatable builds is in the
> compiler/linker, not in the build tool.

This is about making the files CMake writes relocatable, not the
resulting binaries.

--Ben
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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-26 Thread Paul Smith
IMO the right place for managing relocatable builds is in the
compiler/linker, not in the build tool.

The compiler/linker should provide options that allow the output to be
relocatable regardless of the contents of the command line.  GCC for
example has -fdebug-prefix-map that will allow you to remove prefixes
from pathnames in debug sections of the output.  Unfortunately this is
only part of the solution since it doesn't help with __FILE__ (for
example).  Nevertheless this is the right direction, rather than
modifying the build system.


On Thu, 2017-01-26 at 14:01 +, Bøe, Sebastian wrote:
> Thank you for the warning and support. We would prefer to not
> maintain
> a fork, but I have not been able to find any other technology
> that is suitable.
> 
> For future reference. The intended use-case is for CMake to act 
> as an engine in an IDE project generator solution similar to the
> below
> solutions[0].
> 
> [0] 
> http://start.atmel.com/
> http://www.st.com/en/embedded-software/stm32cube-embedded-software.ht
> ml
> 
> 
> 
> -Original Message-
> From: Brad King [mailto:brad.k...@kitware.com] 
> Sent: 26. januar 2017 14:18
> To: Bøe, Sebastian <sebastian@nordicsemi.no>
> Cc: ben.boec...@kitware.com; cmake-developers@cmake.org
> Subject: Re: [cmake-developers] Eclipse CDT Managed build
> 
> On 01/26/2017 05:57 AM, Bøe, Sebastian wrote:
> > 
> > I will investigate relocatable builds, because in spite of this
> > not 
> > being trivial, I think CMake still comes out as the best suited
> > technology for my use-case.
> 
> We once had an option to produce relative paths in the build system
> and it was a never ending mess of bugs.  Eventually it was ripped
> out.
> It is unlikely we will accept changes to try to re-introduce such an
> option.
> 
> -Brad
> 
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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-26 Thread Bøe , Sebastian
Thank you for the warning and support. We would prefer to not maintain
a fork, but I have not been able to find any other technology
that is suitable.

For future reference. The intended use-case is for CMake to act 
as an engine in an IDE project generator solution similar to the below
solutions[0].

[0] 
http://start.atmel.com/
http://www.st.com/en/embedded-software/stm32cube-embedded-software.html



-Original Message-
From: Brad King [mailto:brad.k...@kitware.com] 
Sent: 26. januar 2017 14:18
To: Bøe, Sebastian <sebastian@nordicsemi.no>
Cc: ben.boec...@kitware.com; cmake-developers@cmake.org
Subject: Re: [cmake-developers] Eclipse CDT Managed build

On 01/26/2017 05:57 AM, Bøe, Sebastian wrote:
> I will investigate relocatable builds, because in spite of this not 
> being trivial, I think CMake still comes out as the best suited technology 
> for my use-case.

We once had an option to produce relative paths in the build system and it was 
a never ending mess of bugs.  Eventually it was ripped out.
It is unlikely we will accept changes to try to re-introduce such an option.

-Brad

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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-26 Thread Brad King
On 01/26/2017 05:57 AM, Bøe, Sebastian wrote:
> I will investigate relocatable builds, because in spite of this not being
> trivial, I think CMake still comes out as the best suited technology for my 
> use-case.

We once had an option to produce relative paths in the build system
and it was a never ending mess of bugs.  Eventually it was ripped out.
It is unlikely we will accept changes to try to re-introduce such
an option.

-Brad

-- 

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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-26 Thread Bøe , Sebastian
I was not aware that this was a non-goal. Thank you
for feedback.

I am sorry if my use-case sounds foreign, but I can't use cmake server mode,
because I can't modify the IDE.

I will investigate relocatable builds, because in spite of this not being
trivial, I think CMake still comes out as the best suited technology for my 
use-case.

-Original Message-
From: Brad King [mailto:brad.k...@kitware.com] 
Sent: 25. januar 2017 17:38
To: Bøe, Sebastian <sebastian@nordicsemi.no>
Cc: ben.boec...@kitware.com; cmake-developers@cmake.org
Subject: Re: [cmake-developers] Eclipse CDT Managed build

On 01/25/2017 11:27 AM, Ben Boeckel wrote:
> not be trivial to get CMake to generate relocatable builds.

This is also an explicit non-goal of CMake.

>> after CMake generation the project can be configured through the IDE UI.

That is likely not compatible with CMake's notion of maintaining the build 
system.

This is why previous similar discussions resulted in the cmake server mode and 
in identifying the value of a declarative spec format that can be managed 
outside of CMake's language processor.

-Brad

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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-25 Thread Alexander Neundorf
On 2017 M01 25, Wed 11:38:06 CET Brad King wrote:
> On 01/25/2017 11:27 AM, Ben Boeckel wrote:
> > not be trivial to get CMake to generate relocatable builds.
> 
> This is also an explicit non-goal of CMake.
> 
> >> after CMake generation the project can be configured through the IDE UI.
> 
> That is likely not compatible with CMake's notion of maintaining
> the build system.
> 
> This is why previous similar discussions resulted in the cmake server
> mode and in identifying the value of a declarative spec format that
> can be managed outside of CMake's language processor.

IOW, now that cmake has server-mode, the recommended approach is to implement 
a plugin for cmake-server mode in Eclipse.

Alex

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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-25 Thread Brad King
On 01/25/2017 11:27 AM, Ben Boeckel wrote:
> not be trivial to get CMake to generate relocatable builds.

This is also an explicit non-goal of CMake.

>> after CMake generation the project can be configured through the IDE UI.

That is likely not compatible with CMake's notion of maintaining
the build system.

This is why previous similar discussions resulted in the cmake server
mode and in identifying the value of a declarative spec format that
can be managed outside of CMake's language processor.

-Brad

-- 

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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-25 Thread Ben Boeckel
On Wed, Jan 25, 2017 at 15:45:33 +, Bøe, Sebastian wrote:
> Not modifying the CMakeListst.txt is acceptable for this use-case.
> 
> But not being able to share, or relocate, the build tree is a problem.
> 
> Would support for relocatable build trees need major changes throughout
> CMake, or is this primarily a property of the generator?

It'd need lots of changes. CMake generally uses absolute paths to the
source tree and sometimes to the build tree (I forget the cases where it
does, but that is somewhat generator-dependent). At least one is for the
Makefiles generator where it embed absolute paths in its `cd` commands
before running the compiler. It would likely not be trivial to get CMake
to generate relocatable builds.

--Ben
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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-25 Thread Bøe , Sebastian
Not modifying the CMakeListst.txt is acceptable for this use-case.

But not being able to share, or relocate, the build tree is a problem.

Would support for relocatable build trees need major changes throughout
CMake, or is this primarily a property of the generator?

-Original Message-
From: Ben Boeckel [mailto:ben.boec...@kitware.com] 
Sent: 25. januar 2017 16:31
To: Bøe, Sebastian <sebastian@nordicsemi.no>
Cc: cmake-developers@cmake.org
Subject: Re: [cmake-developers] Eclipse CDT Managed build

On Wed, Jan 25, 2017 at 14:51:26 +, Bøe, Sebastian wrote:
> But in this use-case CMake would only be run once and then the IDE 
> project would take over project configuration for the rest of the 
> application lifetime.

CMake does not generally create relocatable build trees, so you cannot commit 
the generated files. That means that unless the CMakeLists.txt are never going 
to be changed (including via VCS branch changes), CMake may rerun on its own 
and clobber the changes since everyone will need to run it on their own once.

--Ben
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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-25 Thread Ben Boeckel
On Wed, Jan 25, 2017 at 14:51:26 +, Bøe, Sebastian wrote:
> But in this use-case CMake would only be run once and then the 
> IDE project would take over project configuration for the rest
> of the application lifetime.

CMake does not generally create relocatable build trees, so you cannot
commit the generated files. That means that unless the CMakeLists.txt
are never going to be changed (including via VCS branch changes), CMake
may rerun on its own and clobber the changes since everyone will need to
run it on their own once.

--Ben
-- 

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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-25 Thread Bøe , Sebastian
You are right, this is a problem for the usual case of re-running
CMake when the project configuration changes.

But in this use-case CMake would only be run once and then the 
IDE project would take over project configuration for the rest
of the application lifetime.

It also allows the use-case of temporarily doing simple project
configuration through the IDE UI.

-Original Message-
From: Ben Boeckel [mailto:ben.boec...@kitware.com] 
Sent: 25. januar 2017 15:43
To: Bøe, Sebastian <sebastian@nordicsemi.no>
Cc: cmake-developers@cmake.org
Subject: Re: [cmake-developers] Eclipse CDT Managed build

On Wed, Jan 25, 2017 at 14:31:32 +, Bøe, Sebastian wrote:
> I was wondering if anyone has given thought to if it is feasible to 
> have generator support for Eclipse CDT Managed builds?

It would likely be possible, but I don't know of any work towards this goal.

> My motivation for managed build's instead of external Makefile builds, 
> is that after CMake generation the project can be configured through 
> the IDE UI. Which is a useful property in an SDK context.

This could be a problem though. Are the files that the IDE edits separate from 
the ones that CMake generates? If not, how would CMake know not to clobber the 
edited parts of the files it does generate?

--Ben
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Re: [cmake-developers] Eclipse CDT Managed build

2017-01-25 Thread Ben Boeckel
On Wed, Jan 25, 2017 at 14:31:32 +, Bøe, Sebastian wrote:
> I was wondering if anyone has given thought to if
> it is feasible to have generator support for Eclipse CDT
> Managed builds?

It would likely be possible, but I don't know of any work towards this
goal.

> My motivation for managed build's instead of external Makefile
> builds, is that after CMake generation the project can be
> configured through the IDE UI. Which is a useful property in an
> SDK context.

This could be a problem though. Are the files that the IDE edits
separate from the ones that CMake generates? If not, how would CMake
know not to clobber the edited parts of the files it does generate?

--Ben
-- 

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[cmake-developers] Eclipse CDT Managed build

2017-01-25 Thread Bøe , Sebastian
Hi,

I was wondering if anyone has given thought to if
it is feasible to have generator support for Eclipse CDT
Managed builds?

My motivation for managed build's instead of external Makefile
builds, is that after CMake generation the project can be
configured through the IDE UI. Which is a useful property in an
SDK context.

Sebastian Bøe
Nordic Semiconductor ASA
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