"Unusable UNPACK pragma" warnings should be printed even without -O
UNPACK pragmas are ignored when -O is not used, and this is very annoying when developing inside GHCi. Example:
➜ unpack_warning ghc-stage2 Main.hs -Wall -fforce-recomp --make
[1 of 1] Compiling Main ( Main.hs, Main.o )
Linking Main ...
No warning printed even though I used -Wall
. If I add -O
:
➜ unpack_warning ghc-stage2 Main.hs -Wall -fforce-recomp --make -O
[1 of 1] Compiling Main ( Main.hs, Main.o )
Main.hs:5:13: warning:
• Ignoring unusable UNPACK pragma on the first argument of ‘Blah’
• In the definition of data constructor ‘Blah’
In the data type declaration for ‘Blah’
Linking Main ...
This is very annoying, because -O
is ignored in GHCi:
➜ unpack_warning ghc-stage2 Main.hs -Wall -fforce-recomp -O --interactive
when making flags consistent: warning:
-O conflicts with --interactive; -O ignored.
GHCi, version 7.11.20151220: http://www.haskell.org/ghc/ :? for help
[1 of 1] Compiling Main ( Main.hs, interpreted )
Ok, modules loaded: Main.
So basically there's no way to get these warning in GHCi.
Trac metadata
Trac field | Value |
---|---|
Version | 7.11 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |