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digitalmars.D.learn - Dub and compilation

reply Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
As I understand it, Dub compiles a downloaded dependency into the local
Dub cache. This means you cannot store a debug build and a release
build for multiple architectures and different compilers, at the same
time, and you only get a .a file, no .so file.

Cargo downloads source to the cache but compiles to the project area,
separating debug and release builds. Each project has it's own
compilation of the shared source.

I believe Cargo has this right and Dub has this wrong. So wrong that
SCons, CMake, and Meson have a strong role in the D world. As it
stands, Dub is fine for fetching dependencies and then has no more role
to play in the build of a project. Actually then the Dub command has no
useful role since it may well be better for the build tools to just use
the Dub repository API directly.

Unless I have misunderstood Dub, or someone is fixing it.

--=20
Russel.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
Apr 10 2017
next sibling parent reply Mike Parker <aldacron gmail.com> writes:
On Tuesday, 11 April 2017 at 05:15:37 UTC, Russel Winder wrote:

 As I understand it, Dub compiles a downloaded dependency into 
 the local Dub cache. This means you cannot store a debug build 
 and a release build for multiple architectures and different 
 compilers, at the same time, and you only get a .a file, no .so 
 file.


DUB downloads the source of dependencies from github and stores 
it all in the system cache. Each package has its own versioned 
folder in the cache and, when compiled, is given a .dub 
subdirectory in the package root. Beneath that is a 'build' 
directory, with more subdirectories containing the compiled 
binaries, each directory named according to the build 
configuration.

For example, in my system DUB cache I can find the following tree 
for my most recent version of DerelictUtil:

- derelict-util-3.0.0-alpha.2
-- derelict-util
--- .dub
---- build
----- 
library-debug-windows-x86_64-dmd_2073-1A55853403BAAAABC81F905E0C646FAE
----- 
library-debug-windows-x86_64-dmd_2073-95AB5FFC7D0B24B49867C17EFB3ABAE2
----- 
library-debug-windows-x86-dmd_2073-28A666061AF3118C33673AAFB9F3BFDE

You'd have to ask Sönke or someone familiar with the internals 
what the hash represents, but I suspect it has to do with the 
project for which the package was compiled.

Each of the output directories has a copy of DerelictUtil.lib. It 
could just as easily be a shared library if the dependency allows 
that as a configuration.
Apr 10 2017
parent reply Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
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Apr 11 2017
parent reply Mike Parker <aldacron gmail.com> writes:
On Tuesday, 11 April 2017 at 11:13:30 UTC, Russel Winder wrote:


 This is not what seems to happen with unit-threaded. for the 
 directory ~/.dub/packages/unit-threaded-0.7.11/unit-threaded, 
 the tree is:


Just to be clear -- is this what you see after compiling a 
project that depends on unit-threaded, or did you do something 
like `dub build unit-threaded`?
Apr 11 2017
parent Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
On Tue, 2017-04-11 at 13:24 +0000, Mike Parker via Digitalmars-d-learn
wrote:

 On Tuesday, 11 April 2017 at 11:13:30 UTC, Russel Winder wrote:
=20

 This is not what seems to happen with unit-threaded. for the=C2=A0
 directory ~/.dub/packages/unit-threaded-0.7.11/unit-threaded,=C2=A0
 the tree is:


=20
 Just to be clear -- is this what you see after compiling a=C2=A0
 project that depends on unit-threaded, or did you do something=C2=A0
 like `dub build unit-threaded`?
=20


Actually for 0.7.11 I had done lots of fiddling so could not guarantee.
However 0.7.13 appeared unexpectedly and so is a fresh install driven
by an application build dependent on unit-threaded. It has the exact
same structure. So it is the way Dub builds unit-threaded, requiring
rebuild for every change of configuration or platform.

--=20
Russel.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
Apr 11 2017
prev sibling parent reply drug <drug2004 bk.ru> writes:
11.04.2017 08:15, Russel Winder via Digitalmars-d-learn пишет:

 As I understand it, Dub compiles a downloaded dependency into the local
 Dub cache. This means you cannot store a debug build and a release
 build for multiple architectures and different compilers, at the same
 time, and you only get a .a file, no .so file.

 Cargo downloads source to the cache but compiles to the project area,
 separating debug and release builds. Each project has it's own
 compilation of the shared source.

 I believe Cargo has this right and Dub has this wrong. So wrong that
 SCons, CMake, and Meson have a strong role in the D world. As it
 stands, Dub is fine for fetching dependencies and then has no more role
 to play in the build of a project. Actually then the Dub command has no
 useful role since it may well be better for the build tools to just use
 the Dub repository API directly.

 Unless I have misunderstood Dub, or someone is fixing it.


There is possibility to place binaries to specified directory using 
`targetPath` (see `Build settings` in Dub documentation)
Apr 10 2017
parent Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
On Tue, 2017-04-11 at 09:57 +0300, drug via Digitalmars-d-learn wrote:

=20


[=E2=80=A6]

 There is possibility to place binaries to specified directory using=C2=A0
 `targetPath` (see `Build settings` in Dub documentation)


That is fine for the project code, but doesn't help with the
dependencies.

--=20
Russel.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
Apr 11 2017