Haskell stack ignores -Wall -Werror cabal ghc-options flags when building

I would like to always use the "-Wall -Werror" options when building with stack (executing stack build) but adding these flags to ghc-options in package.yaml does nothing. I would also like to avoid passing the --pedantic flag to stack build. Here's the config files:

package.yaml



...

executables:

  XYZ-exe:

    main:                Main.hs

    source-dirs:         app

    ghc-options:

    - -Wall

    - -Werror

    - -threaded

    - -rtsopts

    - -with-rtsopts=-N

    dependencies:

    - XYZ

...



XYZ.cabal



...

executable XYZ-exe

  main-is: Main.hs

  hs-source-dirs:

      app

  ghc-options: -Wall -Werror -threaded -rtsopts -with-rtsopts=-N

...

The "-Wall -Werror" flags are specified in ghc-options but as-if ignored when building. This is the output for stack build:

stack build

Building all executables for `XYZ' once. After a successful build of all of 

them, only specified executables will be rebuilt.

XYZ-0.1.0.0: configure (lib + exe)

Configuring XYZ-0.1.0.0...

XYZ-0.1.0.0: build (lib + exe)

Preprocessing library for XYZ-0.1.0.0..

Building library for XYZ-0.1.0.0..

[  1 of 105] Compiling Data.List.Extras ( srcDataListExtras.hs, .stack- 

workdiste626a42bbuildDataListExtras.o )

... the rest is omitted, all succeed ...

And here's the output for stack build --pedantic

stack build --pedantic

Building all executables for `HStat' once. After a successful build of all of them, only specified executables will be rebuilt.

HStat-0.1.0.0: configure (lib + exe)

Configuring HStat-0.1.0.0...

HStat-0.1.0.0: build (lib + exe)

Preprocessing library for HStat-0.1.0.0..

Building library for HStat-0.1.0.0..

[  1 of 105] Compiling Data.List.Extras ( srcDataListExtras.hs, .stack-workdiste626a42bbuildDataListExtras.o )



srcDataListExtras.hs:4:1: error: [-Wunused-imports, -Werror=unused-imports]

    The import of ‘Data.Maybe’ is redundant

      except perhaps to import instances from ‘Data.Maybe’

    To import instances alone, use: import Data.Maybe()

  |

4 | import           Data.Maybe

  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

This works as expected - srcDataListExtras.hs indeed does have an unused Data.Maybe import. What am I doing wrong?

edited Jan 8 at 23:41

sjakobi

2,3561433

asked Jan 2 at 8:51

Petras Purlys

429211

I can't reproduce this issue. I just created a fresh stack project (stack new foo), added -Wall -Werror as you did to the executable section in package.yaml, removed a signature to trigger a warning in app/Main.hs, then stack build gave an error, as expected. Can you show the commands you ran and the resulting output?

– Li-yao Xia
Jan 2 at 9:57

I will be able to show yhe output in an hour or so. For the time being, the command I ran was s simple stack build (that just happily compiled even though there were unused imports, shadowing... . However, running stack build --pedantic worked as expected - it showed the unused imports and other warnings.

– Petras Purlys
Jan 2 at 10:05

BTW, Which Stack version are you using ?

– Sibi
Jan 2 at 10:11

1

Can you post your entire package.yaml ?

– Sibi
Jan 2 at 11:01

1

Thanks @Sibi, while doing that I've noticed that it's possible do define ghc-options for the library part as well. Doing that solved the issue.

– Petras Purlys
Jan 2 at 11:11

|
show 2 more comments

package.yaml



...

executables:

  XYZ-exe:

    main:                Main.hs

    source-dirs:         app

    ghc-options:

    - -Wall

    - -Werror

    - -threaded

    - -rtsopts

    - -with-rtsopts=-N

    dependencies:

    - XYZ

...



XYZ.cabal



...

executable XYZ-exe

  main-is: Main.hs

  hs-source-dirs:

      app

  ghc-options: -Wall -Werror -threaded -rtsopts -with-rtsopts=-N

...

The "-Wall -Werror" flags are specified in ghc-options but as-if ignored when building. This is the output for stack build:

stack build

Building all executables for `XYZ' once. After a successful build of all of 

them, only specified executables will be rebuilt.

XYZ-0.1.0.0: configure (lib + exe)

Configuring XYZ-0.1.0.0...

XYZ-0.1.0.0: build (lib + exe)

Preprocessing library for XYZ-0.1.0.0..

Building library for XYZ-0.1.0.0..

[  1 of 105] Compiling Data.List.Extras ( srcDataListExtras.hs, .stack- 

workdiste626a42bbuildDataListExtras.o )

... the rest is omitted, all succeed ...

And here's the output for stack build --pedantic

stack build --pedantic

Building all executables for `HStat' once. After a successful build of all of them, only specified executables will be rebuilt.

HStat-0.1.0.0: configure (lib + exe)

Configuring HStat-0.1.0.0...

HStat-0.1.0.0: build (lib + exe)

Preprocessing library for HStat-0.1.0.0..

Building library for HStat-0.1.0.0..

[  1 of 105] Compiling Data.List.Extras ( srcDataListExtras.hs, .stack-workdiste626a42bbuildDataListExtras.o )



srcDataListExtras.hs:4:1: error: [-Wunused-imports, -Werror=unused-imports]

    The import of ‘Data.Maybe’ is redundant

      except perhaps to import instances from ‘Data.Maybe’

    To import instances alone, use: import Data.Maybe()

  |

4 | import           Data.Maybe

  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

This works as expected - srcDataListExtras.hs indeed does have an unused Data.Maybe import. What am I doing wrong?

edited Jan 8 at 23:41

sjakobi

2,3561433

asked Jan 2 at 8:51

Petras Purlys

429211

I can't reproduce this issue. I just created a fresh stack project (stack new foo), added -Wall -Werror as you did to the executable section in package.yaml, removed a signature to trigger a warning in app/Main.hs, then stack build gave an error, as expected. Can you show the commands you ran and the resulting output?

– Li-yao Xia
Jan 2 at 9:57

I will be able to show yhe output in an hour or so. For the time being, the command I ran was s simple stack build (that just happily compiled even though there were unused imports, shadowing... . However, running stack build --pedantic worked as expected - it showed the unused imports and other warnings.

– Petras Purlys
Jan 2 at 10:05

BTW, Which Stack version are you using ?

– Sibi
Jan 2 at 10:11

1

Can you post your entire package.yaml ?

– Sibi
Jan 2 at 11:01

1

Thanks @Sibi, while doing that I've noticed that it's possible do define ghc-options for the library part as well. Doing that solved the issue.

– Petras Purlys
Jan 2 at 11:11

|
show 2 more comments

package.yaml



...

executables:

  XYZ-exe:

    main:                Main.hs

    source-dirs:         app

    ghc-options:

    - -Wall

    - -Werror

    - -threaded

    - -rtsopts

    - -with-rtsopts=-N

    dependencies:

    - XYZ

...



XYZ.cabal



...

executable XYZ-exe

  main-is: Main.hs

  hs-source-dirs:

      app

  ghc-options: -Wall -Werror -threaded -rtsopts -with-rtsopts=-N

...

The "-Wall -Werror" flags are specified in ghc-options but as-if ignored when building. This is the output for stack build:

stack build

Building all executables for `XYZ' once. After a successful build of all of 

them, only specified executables will be rebuilt.

XYZ-0.1.0.0: configure (lib + exe)

Configuring XYZ-0.1.0.0...

XYZ-0.1.0.0: build (lib + exe)

Preprocessing library for XYZ-0.1.0.0..

Building library for XYZ-0.1.0.0..

[  1 of 105] Compiling Data.List.Extras ( srcDataListExtras.hs, .stack- 

workdiste626a42bbuildDataListExtras.o )

... the rest is omitted, all succeed ...

And here's the output for stack build --pedantic

stack build --pedantic

Building all executables for `HStat' once. After a successful build of all of them, only specified executables will be rebuilt.

HStat-0.1.0.0: configure (lib + exe)

Configuring HStat-0.1.0.0...

HStat-0.1.0.0: build (lib + exe)

Preprocessing library for HStat-0.1.0.0..

Building library for HStat-0.1.0.0..

[  1 of 105] Compiling Data.List.Extras ( srcDataListExtras.hs, .stack-workdiste626a42bbuildDataListExtras.o )



srcDataListExtras.hs:4:1: error: [-Wunused-imports, -Werror=unused-imports]

    The import of ‘Data.Maybe’ is redundant

      except perhaps to import instances from ‘Data.Maybe’

    To import instances alone, use: import Data.Maybe()

  |

4 | import           Data.Maybe

  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

This works as expected - srcDataListExtras.hs indeed does have an unused Data.Maybe import. What am I doing wrong?

edited Jan 8 at 23:41

sjakobi

2,3561433

asked Jan 2 at 8:51

Petras Purlys

429211

package.yaml



...

executables:

  XYZ-exe:

    main:                Main.hs

    source-dirs:         app

    ghc-options:

    - -Wall

    - -Werror

    - -threaded

    - -rtsopts

    - -with-rtsopts=-N

    dependencies:

    - XYZ

...



XYZ.cabal



...

executable XYZ-exe

  main-is: Main.hs

  hs-source-dirs:

      app

  ghc-options: -Wall -Werror -threaded -rtsopts -with-rtsopts=-N

...

The "-Wall -Werror" flags are specified in ghc-options but as-if ignored when building. This is the output for stack build:

stack build

Building all executables for `XYZ' once. After a successful build of all of 

them, only specified executables will be rebuilt.

XYZ-0.1.0.0: configure (lib + exe)

Configuring XYZ-0.1.0.0...

XYZ-0.1.0.0: build (lib + exe)

Preprocessing library for XYZ-0.1.0.0..

Building library for XYZ-0.1.0.0..

[  1 of 105] Compiling Data.List.Extras ( srcDataListExtras.hs, .stack- 

workdiste626a42bbuildDataListExtras.o )

... the rest is omitted, all succeed ...

And here's the output for stack build --pedantic

stack build --pedantic

Building all executables for `HStat' once. After a successful build of all of them, only specified executables will be rebuilt.

HStat-0.1.0.0: configure (lib + exe)

Configuring HStat-0.1.0.0...

HStat-0.1.0.0: build (lib + exe)

Preprocessing library for HStat-0.1.0.0..

Building library for HStat-0.1.0.0..

[  1 of 105] Compiling Data.List.Extras ( srcDataListExtras.hs, .stack-workdiste626a42bbuildDataListExtras.o )



srcDataListExtras.hs:4:1: error: [-Wunused-imports, -Werror=unused-imports]

    The import of ‘Data.Maybe’ is redundant

      except perhaps to import instances from ‘Data.Maybe’

    To import instances alone, use: import Data.Maybe()

  |

4 | import           Data.Maybe

  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

This works as expected - srcDataListExtras.hs indeed does have an unused Data.Maybe import. What am I doing wrong?

haskell ghc cabal haskell-stack

edited Jan 8 at 23:41

sjakobi

2,3561433

asked Jan 2 at 8:51

Petras Purlys

429211

edited Jan 8 at 23:41

sjakobi

2,3561433

asked Jan 2 at 8:51

Petras Purlys

429211

edited Jan 8 at 23:41

sjakobi

2,3561433

edited Jan 8 at 23:41

sjakobi

2,3561433

edited Jan 8 at 23:41

sjakobi

2,3561433

asked Jan 2 at 8:51

Petras Purlys

429211

asked Jan 2 at 8:51

Petras Purlys

429211

asked Jan 2 at 8:51

Petras Purlys

429211

I can't reproduce this issue. I just created a fresh stack project (stack new foo), added -Wall -Werror as you did to the executable section in package.yaml, removed a signature to trigger a warning in app/Main.hs, then stack build gave an error, as expected. Can you show the commands you ran and the resulting output?

– Li-yao Xia
Jan 2 at 9:57

I will be able to show yhe output in an hour or so. For the time being, the command I ran was s simple stack build (that just happily compiled even though there were unused imports, shadowing... . However, running stack build --pedantic worked as expected - it showed the unused imports and other warnings.

– Petras Purlys
Jan 2 at 10:05

BTW, Which Stack version are you using ?

– Sibi
Jan 2 at 10:11

1

Can you post your entire package.yaml ?

– Sibi
Jan 2 at 11:01

1

Thanks @Sibi, while doing that I've noticed that it's possible do define ghc-options for the library part as well. Doing that solved the issue.

– Petras Purlys
Jan 2 at 11:11

|
show 2 more comments

I can't reproduce this issue. I just created a fresh stack project (stack new foo), added -Wall -Werror as you did to the executable section in package.yaml, removed a signature to trigger a warning in app/Main.hs, then stack build gave an error, as expected. Can you show the commands you ran and the resulting output?

– Li-yao Xia
Jan 2 at 9:57

I will be able to show yhe output in an hour or so. For the time being, the command I ran was s simple stack build (that just happily compiled even though there were unused imports, shadowing... . However, running stack build --pedantic worked as expected - it showed the unused imports and other warnings.

– Petras Purlys
Jan 2 at 10:05

BTW, Which Stack version are you using ?

– Sibi
Jan 2 at 10:11

1

Can you post your entire package.yaml ?

– Sibi
Jan 2 at 11:01

1

Thanks @Sibi, while doing that I've noticed that it's possible do define ghc-options for the library part as well. Doing that solved the issue.

– Petras Purlys
Jan 2 at 11:11

I can't reproduce this issue. I just created a fresh stack project (stack new foo), added -Wall -Werror as you did to the executable section in package.yaml, removed a signature to trigger a warning in app/Main.hs, then stack build gave an error, as expected. Can you show the commands you ran and the resulting output?

– Li-yao Xia
Jan 2 at 9:57

I will be able to show yhe output in an hour or so. For the time being, the command I ran was s simple stack build (that just happily compiled even though there were unused imports, shadowing... . However, running stack build --pedantic worked as expected - it showed the unused imports and other warnings.

– Petras Purlys
Jan 2 at 10:05

BTW, Which Stack version are you using ?

– Sibi
Jan 2 at 10:11

Can you post your entire package.yaml ?

– Sibi
Jan 2 at 11:01

Thanks @Sibi, while doing that I've noticed that it's possible do define ghc-options for the library part as well. Doing that solved the issue.

– Petras Purlys
Jan 2 at 11:11

|
show 2 more comments

1 Answer
1

active

oldest

votes

The ghc-options flags had to be separately defined in the library part of package.yaml:

library:

  source-dirs: src

  ghc-options:

  - -Wall

  - -Werror

  - -fwarn-incomplete-uni-patterns

Doing that solved the issue.

answered Jan 2 at 11:13

Petras Purlys

429211

add a comment |

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1 Answer
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active

oldest

votes

The ghc-options flags had to be separately defined in the library part of package.yaml:

library:

  source-dirs: src

  ghc-options:

  - -Wall

  - -Werror

  - -fwarn-incomplete-uni-patterns

Doing that solved the issue.

answered Jan 2 at 11:13

Petras Purlys

429211

add a comment |

The ghc-options flags had to be separately defined in the library part of package.yaml:

library:

  source-dirs: src

  ghc-options:

  - -Wall

  - -Werror

  - -fwarn-incomplete-uni-patterns

Doing that solved the issue.

answered Jan 2 at 11:13

Petras Purlys

429211

add a comment |

The ghc-options flags had to be separately defined in the library part of package.yaml:

library:

  source-dirs: src

  ghc-options:

  - -Wall

  - -Werror

  - -fwarn-incomplete-uni-patterns

Doing that solved the issue.

answered Jan 2 at 11:13

Petras Purlys

429211

The ghc-options flags had to be separately defined in the library part of package.yaml:

library:

  source-dirs: src

  ghc-options:

  - -Wall

  - -Werror

  - -fwarn-incomplete-uni-patterns

Doing that solved the issue.

answered Jan 2 at 11:13

Petras Purlys

429211

answered Jan 2 at 11:13

Petras Purlys

429211

answered Jan 2 at 11:13

Petras Purlys

429211

answered Jan 2 at 11:13

Petras Purlys

429211

add a comment |

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