GHC recompiles unchanged hs-boot files
A.hs:
module A where
import B
f = someError
A.hs-boot:
module A where
B.hs:
module B where
import {-# SOURCE #-} A
$ ghc-7.10.3 --make A.hs
[1 of 3] Compiling A[boot] ( A.hs-boot, A.o-boot )
[2 of 3] Compiling B ( B.hs, B.o )
[3 of 3] Compiling A ( A.hs, A.o )
A.hs:5:5: Not in scope: ‘someError’
$ ghc-7.10.3 --make A.hs
[1 of 3] Compiling A[boot] ( A.hs-boot, A.o-boot )
[3 of 3] Compiling A ( A.hs, A.o )
A.hs:5:5: Not in scope: ‘someError’
Why does ghc --make
recompile B.hs-boot
?
Note that recompilation avoidance does work when using ghc -c
:
$ ghc -c A.hs-boot
compilation IS NOT required
(found while trying to reduce the testcase for #11532 (closed), which contains 644 .hs and 642 .hs-boot files)
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Driver |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | ezyang |
Operating system | |
Architecture |