For thread-safety reasons, the GNU C Library (2.2+) defines "errno"
as a macro that calls a function to get the errno of the current thread.
Consequently, the source file "src/runtime/Builtin/cIOExtras.c" needs
to include the <errno.h> header file, rather than declaring an extern
variable.
Diff:
==========================================================================
*** cIOExtras.old.c Wed May 23 14:54:58 2001
--- cIOExtras.c Wed May 23 14:26:54 2001
***************
*** 1,10 ****
/* basic unsafe utilities, defined in IOExtras */
#include "cinterface.h"
#include "mk.h"
void performGC () { C_GC(0); }
int unsafePtrEq (void* a, void* b) { return (a==b); }
/* basic error handling via C's errno */
! extern int errno;
int getErrNo (void) { return errno; }
--- 1,11 ----
/* basic unsafe utilities, defined in IOExtras */
#include "cinterface.h"
#include "mk.h"
+ #include "errno.h"
void performGC () { C_GC(0); }
int unsafePtrEq (void* a, void* b) { return (a==b); }
/* basic error handling via C's errno */
! /*extern int errno;*/
int getErrNo (void) { return errno; }
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