Job Failed #1048795 due to too long build log cause by C compiler warnings

Job #1048795 failed for e0566a9b:

The build log contains many warnings of the form:

250 | EXTERN_INLINE bool LOOKS_LIKE_INFO_PTR_NOT_NULL (StgWord p)
rts/include/rts/storage/ClosureMacros.h:66:32: error:
     warning: no previous prototype for ‘itbl_to_fun_itbl’ [-Wmissing-prototypes]
     EXTERN_INLINE StgFunInfoTable *itbl_to_fun_itbl(const StgInfoTable *i) {return (StgFunInfoTable *)(i + 1) - 1;}
                                    ^
   |
66 | EXTERN_INLINE StgFunInfoTable *itbl_to_fun_itbl(const StgInfoTable *i) {return (StgFunInfoTable *)(i + 1) - 1;}
    |                    ^

   | 

which renders the build log useless.