libraries/base/System/Posix/Types.hs: tries to define Floating instance for opaque type
I've noticed it as a build failure on openbsd-6 but on linux behaviour is strange as well.
Build failure:
libraries/base/System/Posix/Types.hs:217:100: error:
* No instance for (Fractional Int32)
arising from the 'deriving' clause of a data type declaration
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
* When deriving the instance for (Fractional CTimer)
On openbsd-6.0 timer_t is an int32:
# gcc -E /usr/include/time.h | grep timer_t
typedef __int32_t __timer_t;
typedef __timer_t timer_t;
On amd64-linux-glibc it's void*:
$ gcc -E /usr/include/time.h | grep timer_t
typedef void * __timer_t;
typedef __timer_t timer_t;
But base's configure detects it as Double (by chance) on amd64-linux-glibc.
System.Posix.Types> :t CTimer
CTimer :: Double -> CTimer
Trac metadata
Trac field | Value |
---|---|
Version | 8.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |