GHC99 failed to build: perhaps need to add ‘os-string’ to the build-depends

[futu2]

Configuring library for hashable-1.4.3.0..
Preprocessing library for hashable-1.4.3.0..
Building library for hashable-1.4.3.0..
[1 of 7] Compiling Data.Hashable.Imports ( src/Data/Hashable/Imports.hs, dist/build/Data/Hashable/Imports.o )
[2 of 7] Compiling Data.Hashable.LowLevel ( src/Data/Hashable/LowLevel.hs, dist/build/Data/Hashable/LowLevel.o )

/tmp/ghc985652_0/ghc_8.c:11:221: error:
     warning: passing 'char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
       11 | HsWord32 ghczuwrapperZC1ZChashablezm1zi4zi3zi0zm7ac6542072cd042b9ee3c6ad06eda0521f254b34a3408c1c856e5b8981845cc0ZCDataziHashableziLowLevelZChashablezufnvzuhash(char* a1, HsInt32 a2, HsInt32 a3) {return hashable_fnv_hash(a1, a2, a3);}
          |                                                                                                                                                                                                                             ^~
   |
11 | HsWord32 ghczuwrapperZC1ZChashablezm1zi4zi3zi0zm7ac6542072cd042b9ee3c6ad06eda0521f254b34a3408c1c856e5b8981845cc0ZCDataziHashableziLowLevelZChashablezufnvzuhash(char* a1, HsInt32 a2, HsInt32 a3) {return hashable_fnv_hash(a1, a2, a3);}
   |                                                                                                                                                                                                                             ^

include/HsHashable.h:19:53: error:
     note: passing argument to parameter 'str' here
       19 | FNV_UNSIGNED hashable_fnv_hash(const unsigned char* str, FNV_SIGNED len, FNV_UNSIGNED salt);
          |                                                     ^
   |
19 | FNV_UNSIGNED hashable_fnv_hash(const unsigned char* str, FNV_SIGNED len, FNV_UNSIGNED salt);
   |                                                     ^
1 warning generated.
[3 of 7] Compiling Data.Hashable.Class ( src/Data/Hashable/Class.hs, dist/build/Data/Hashable/Class.o )

src/Data/Hashable/Class.hs:167:1: error: [GHC-87110]
    Could not load module ‘System.OsString.Internal.Types’.
    It is a member of the hidden package ‘os-string-2.0.2’.
    Perhaps you need to add ‘os-string’ to the build-depends in your .cabal file.
    It is a member of the hidden package ‘filepath-1.4.100.4’.
    Perhaps you need to add ‘filepath’ to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.
    |
167 | import System.OsString.Internal.Types (OsString (..), PosixString (..), WindowsString (..))
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

[phadej]

Do you use allow-newer, which filepath version you are building hashable against.

Currently, hashable doesn't support filepath-1.5.

[futu2]

Thx, it works after removing allow-newer in cabal.project.