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D.gnu - How to turn off warnings as errors

reply Chris Piker <chris hoopjump.com> writes:
Hi GDC

I'm testing the new gdc version 12.1 by compiling vibe.d and 
various other packages.  One problem that tripping me up when 
running commands like:
```
cd memutils
dub build --compiler=gdc-12
```
is that all deprecation warnings are treated as errors.  (For my 
local build of gdc, '-12' has been added as a program suffix.)

Most of the messages are similar to the following:
```
source/memutils/rbtree.d:734:9: error: Usage of the ‘body’ 
keyword is deprecated. Use ‘do’ instead. [-Werror=deprecated]
```

These are dub packages and I don't see how to set '-Wno-error' 
from the dub command line. Since I'm reluctant to change every 
dub.json file that I encounter, is there a global flag that will 
turn off -Werror for gdc?

Thanks for the advice (and thanks for gdc),
May 21 2022
parent reply rikki cattermole <rikki cattermole.co.nz> writes:
On 22/05/2022 2:56 PM, Chris Piker wrote:

 These are dub packages and I don't see how to set '-Wno-error' from the 
 dub command line. Since I'm reluctant to change every dub.json file that 
 I encounter, is there a global flag that will turn off -Werror for gdc?


This is a dub issue, it has nothing to do with the compiler.

$ DFLAGS="..." dub ...

However if you hit these issues, its because there is a problem with 
that package.

In the case with memutils, it hasn't even got a working CI right now.
Nor is this the only issue it has that would mean it won't compile[0].

[0] https://github.com/etcimon/memutils/issues/19
May 21 2022
parent reply Chris Piker <chris hoopjump.com> writes:
On Sunday, 22 May 2022 at 03:02:17 UTC, rikki cattermole wrote:


 This is a dub issue, it has nothing to do with the compiler.


Yea, there seem to be lots of dub issues, just looking for a 
workaround, hoping compiler features might save the day.


 $ DFLAGS="..." dub ...


Thanks! This seems to work well for vibe-core 1.22.3 anyway:

```bash
cd vibe-core


works
```

As a general bit of dev-culture advice, would you recommend that 
I file issues on packages that only build using `-Wno-deprecated` 
?

Also, is there a way to compile gdc itself such that it's 
behavior is closer to dmd's when it comes to deprecated features? 
  The `--disable-werror` configure flag looks like it only affects 
behavior while building the compiler itself.
May 21 2022
parent reply rikki cattermole <rikki cattermole.co.nz> writes:
On 22/05/2022 3:42 PM, Chris Piker wrote:

 As a general bit of dev-culture advice, would you recommend that I file 
 issues on packages that only build using `-Wno-deprecated` ?


You can do that, but usually the reason it is like that is because 
nobody has worked on the project in a while and you could be waiting 
forever more if you don't file a PR for it.


 Also, is there a way to compile gdc itself such that it's behavior is 
 closer to dmd's when it comes to deprecated features?  The 
 `--disable-werror` configure flag looks like it only affects behavior 
 while building the compiler itself.


Dub adds the flag for warnings as errors. Its not a bug, that is a 
feature. This applies for all compilers.
May 21 2022
parent Iain Buclaw <ibuclaw gdcproject.org> writes:
Excerpts from rikki cattermole via D.gnu's message of Mai 22, 2022 7:18 am:

 
 On 22/05/2022 3:42 PM, Chris Piker wrote:

 As a general bit of dev-culture advice, would you recommend that I file 
 issues on packages that only build using `-Wno-deprecated` ?


 
 You can do that, but usually the reason it is like that is because 
 nobody has worked on the project in a while and you could be waiting 
 forever more if you don't file a PR for it.
 

 Also, is there a way to compile gdc itself such that it's behavior is 
 closer to dmd's when it comes to deprecated features?  The 
 `--disable-werror` configure flag looks like it only affects behavior 
 while building the compiler itself.


 
 Dub adds the flag for warnings as errors. Its not a bug, that is a 
 feature. This applies for all compilers.
 


It looks like this is correct as per the documentation of dub.

https://github.com/dlang/dub/wiki/DEP1#build-requirements

You either have disallowDeprecations or silenceDeprecations.  There is
no build option for allowing deprecations.

Iain.
May 23 2022