I was reading https://blog.rust-lang.org/2017/07/05/Rust-Roadmap-Update.html, which mentioned that the Rust compiler now has a mode to go through the motions of compiling and show errors, but without generating any code. This way you can do a much faster build while iterating until you have no compile errors, then do a single build with code generation once everything looks good.

I was wondering what people's thoughts on this was. I haven't gone digging through DMD's codebase recently. Is DMD set up in such a way that this would be feasible to implement? Does this even make sense with the way DMD generates code, or would it only work for a language like Rust that does a ton of compile-time checking?

DMD already compiles pretty fast, and this strikes me as a useful feature to further cement D's competitive edge with respect to compilation speed.

On Wednesday, 5 July 2017 at 21:58:45 UTC, Lewis wrote:
> I was reading https://blog.rust-lang.org/2017/07/05/Rust-Roadmap-Update.html, which mentioned that the Rust compiler now has a mode to go through the motions of compiling and show errors, but without generating any code. This way you can do a much faster build while iterating until you have no compile errors, then do a single build with code generation once everything looks good.
>
> [...]

We already have it.
use -o- and it'll disable codegen.

Am Wed, 05 Jul 2017 22:05:53 +0000
schrieb Stefan Koch <uplink.coder@googlemail.com>:

> On Wednesday, 5 July 2017 at 21:58:45 UTC, Lewis wrote:
> > I was reading https://blog.rust-lang.org/2017/07/05/Rust-Roadmap-Update.html, which mentioned that the Rust compiler now has a mode to go through the motions of compiling and show errors, but without generating any code. This way you can do a much faster build while iterating until you have no compile errors, then do a single build with code generation once everything looks good.
> >
> > [...]
> 
> We already have it.
> use -o- and it'll disable codegen.

And GDC supports the standard -fsyntax-only GCC flag.


-- Johannes

On Wednesday, 5 July 2017 at 22:05:53 UTC, Stefan Koch wrote:
> On Wednesday, 5 July 2017 at 21:58:45 UTC, Lewis wrote:
>> I was reading https://blog.rust-lang.org/2017/07/05/Rust-Roadmap-Update.html, which mentioned that the Rust compiler now has a mode to go through the motions of compiling and show errors, but without generating any code. This way you can do a much faster build while iterating until you have no compile errors, then do a single build with code generation once everything looks good.
>>
>> [...]
>
> We already have it.
> use -o- and it'll disable codegen.

Well there you go, D is already ahead of the game. Thanks!

On Wednesday, 5 July 2017 at 22:05:53 UTC, Stefan Koch wrote:
> On Wednesday, 5 July 2017 at 21:58:45 UTC, Lewis wrote:
>> I was reading https://blog.rust-lang.org/2017/07/05/Rust-Roadmap-Update.html, which mentioned that the Rust compiler now has a mode to go through the motions of compiling and show errors, but without generating any code. This way you can do a much faster build while iterating until you have no compile errors, then do a single build with code generation once everything looks good.
>>
>> [...]
>
> We already have it.
> use -o- and it'll disable codegen.


How to use this parameter with dub?

On Friday, 7 July 2017 at 11:14:40 UTC, Suliman wrote:
> On Wednesday, 5 July 2017 at 22:05:53 UTC, Stefan Koch wrote:
>> On Wednesday, 5 July 2017 at 21:58:45 UTC, Lewis wrote:
>>> I was reading https://blog.rust-lang.org/2017/07/05/Rust-Roadmap-Update.html, which mentioned that the Rust compiler now has a mode to go through the motions of compiling and show errors, but without generating any code. This way you can do a much faster build while iterating until you have no compile errors, then do a single build with code generation once everything looks good.
>>>
>>> [...]
>>
>> We already have it.
>> use -o- and it'll disable codegen.
>
>
> How to use this parameter with dub?

"buildOptions" with "syntaxOnly"

On Friday, 7 July 2017 at 11:14:40 UTC, Suliman wrote:
> On Wednesday, 5 July 2017 at 22:05:53 UTC, Stefan Koch wrote:
>> On Wednesday, 5 July 2017 at 21:58:45 UTC, Lewis wrote:
>>> I was reading https://blog.rust-lang.org/2017/07/05/Rust-Roadmap-Update.html, which mentioned that the Rust compiler now has a mode to go through the motions of compiling and show errors, but without generating any code. This way you can do a much faster build while iterating until you have no compile errors, then do a single build with code generation once everything looks good.
>>>
>>> [...]
>>
>> We already have it.
>> use -o- and it'll disable codegen.
>
>
> How to use this parameter with dub?

Via `dflags` [1][2]

[1] https://code.dlang.org/package-format?lang=json#build-settings
[2] https://code.dlang.org/package-format?lang=sdl#build-settings