[CMake] Predownload

Tue Apr 18 18:20:34 EDT 2017

On Tue, Apr 18, 2017 at 3:24 PM, Zabel, Oliver <oliverzabel at gmx.de> wrote:

> Hi,  thanks a lot for your input. I will take a look at the SuperProject
> (with ExternalProject_Add() call) constellation as well as the meta build
> tools. I'm quite new to this stuff, so please allow me my question: does
> this even make sense what i'm trying or are there some "patterns" that
> handles this stuff that i'm not aware of?
>

If it works in your situation, then it makes sense. ;) I'm not aware of any
particular common pattern for what you're trying to do, so you may just
have to experiment a bit. Not sure if it is relevant or if it will just be
a distraction for you, but you may find Ruslo's polly project to be an
interesting resource for toolchains.

https://github.com/ruslo/polly

>
> *Gesendet:* Dienstag, 18. April 2017 um 00:23 Uhr
> *Von:* "Craig Scott" <craig.scott at crascit.com>
> *An:* "Florent Castelli" <florent.castelli at gmail.com>
> *Cc:* CMake <cmake at cmake.org>, "Zabel, Oliver" <oliverzabel at gmx.de>
> *Betreff:* Re: [CMake] Predownload
> The top level build doesn't actually need to build anything itself. It
> would just become a sequence of ExternalProject_Add() calls with some
> simple logic for selecting which things to turn on/off, etc. The first
> ExternalProject_Add() would download the toolchain files. The subsequent
> ExternalProject_Add() calls could then use those toolchain files in their
> configure steps. You just need to ensure you create the dependencies
> between the ExternalProject targets to ensure the toolchain downloads
> happen before the other ExternalProject targets that need them.
>
>
> On Tue, Apr 18, 2017 at 8:21 AM, Florent Castelli <
> florent.castelli at gmail.com> wrote:
>>
>> Don't you need the toolchain to be configured (Aka project() called)
>> before ExternalProject? You wouldn't be able to update it after the
>> download.
>>
>> /Florent
>>
>> On Apr 17, 2017 11:18 PM, "Craig Scott" <craig.scott at crascit.com> wrote:
>>>
>>> Actually, ExternalProject could even be used to download and unpack the
>>> toolchain files in a superbuild arrangement too. Probably makes more sense
>>> now that I think about it, since it provides unpacking as well, not just
>>> downloading and has a much richer set of download methods.
>>>
>>> On Tue, Apr 18, 2017 at 8:16 AM, Craig Scott <craig.scott at crascit.com>
>>> wrote:
>>>>
>>>> One option may be a superbuild arrangement (based on ExternalProject,
>>>> online searches should give you details). The only thing the top level
>>>> would do is setup the sub builds, including downloading and selecting which
>>>> toolchain(s) to use for each sub build.
>>>>
>>>>
>>>> On Tue, Apr 18, 2017 at 8:03 AM, Florent Castelli <
>>>> florent.castelli at gmail.com> wrote:
>>>>>
>>>>> It is possible.
>>>>>
>>>>> Nothing prevents you from calling execute_process to download as
>>>>> extract your toolchain file when it is run. You probably want to check the
>>>>> destination folder for a pre existing download though.
>>>>>
>>>>
>>>>
>>>> If you use file(DOWNLOAD...) for downloading the toolchain files and
>>>> you specify an EXPECTED_HASH, this will also conveniently take care of only
>>>> downloading the file if it isn't already present. Shouldn't need to resort
>>>> to execute_process() to do the download.
>>>>
>>>>
>>>>
>>>>
>>>>> Then, you proceed on configuring Cmake to use it as usual.
>>>>>
>>>>> /Florent
>>>>>
>>>>> On Apr 17, 2017 14:11, "Zabel, Oliver" <oliverzabel at gmx.de> wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>>
>>>>>
>>>>> i’m developing Software for embedded Systems and my applications Need
>>>>> to run on different target platforms. Until now we are build our Code with
>>>>> make but i’d like to Switch to cmake. ATM we’re putting our Compiler
>>>>> toolchains in our VCS to be able to produce the same binarys even after
>>>>> years. Until now, there is only one toolchain include in a Project as
>>>>> svn-external/git submodule. But i want to use toolchain-files with cmake.
>>>>>
>>>>>
>>>>>
>>>>> Now here is my idea and i’d like to know whether this is possible with
>>>>> cmake.
>>>>>
>>>>> I have my Project root and in this Folder i’d like to have different
>>>>> toolchain files for different Compilers. I’d like to exclude the Compilers
>>>>> as external.
>>>>>
>>>>> Now i’d like to build the cmake Cache by calling cmake with the
>>>>> required toolchain file. Is it now somehow possible, to download the
>>>>> required toolchain before the Cache is buidl up? If this would be possible,
>>>>> i could dynamicly choose which toolchain i want to have – would be great
>>>>> for Compiler / unit Tests as well.
>>>>>
>>>>>
>>>>>
>>>>> Perhaps someone has a better idea to do this or even i using such a
>>>>> System and give me a hint?
>>>>>
>>>>>
>>>>>
>>>>> Thanks a lot!
>>>>>
>>>>>
>>>>>
>>>>> Best regards,
>>>>>
>>>>> Oliver
>>>>>
>>>>> --
>>>>>
>>>>> Powered by www.kitware.com
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>>>>> Powered by www.kitware.com
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>>>>> Please keep messages on-topic and check the CMake FAQ at:
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>>>>>
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>>>>>
>>>>> CMake Support: http://cmake.org/cmake/help/support.html
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>>>>
>>>>
>>>>
>>>> --
>>>> Craig Scott
>>>> Melbourne, Australia
>>>> https://crascit.com
>>>>
>>>
>>>
>>> --
>>> Craig Scott
>>> Melbourne, Australia
>>> https://crascit.com
>>>
>>
>
> --
> Craig Scott
> Melbourne, Australia
> https://crascit.com
>

-- 
Craig Scott
Melbourne, Australia
https://crascit.com
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