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Fix for bug #42965: isinf() on 32bit x86 with gcc 4.3 can

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produce incorrect results for ROUND() 

Added a workaround and a configure check to test whether 
isinf() is affected by the GCC bug #39228. 
       
Since no code in MySQL server is currently affected by that 
bug, the patch is actually a safeguard for possible future 
code modifications. No test cases or changelog entries are 
needed. 


configure.in:
  Added a configure check to test whether isinf() is safe to use
  in C code.
include/my_global.h:
  Added a workaround for GCC bug #39228.
This commit is contained in:
Alexey Kopytov
2009-03-24 11:26:22 +03:00
parent 4568152518
commit bbe24f03f2
2 changed files with 33 additions and 2 deletions
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14
include/my_global.h
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@ -797,9 +797,19 @@ typedef SOCKET_SIZE_TYPE size_socket;
#endif
#ifdef HAVE_ISINF
/* isinf() can be used in both C and C++ code */
#define my_isinf(X) isinf(X)
/* Check if C compiler is affected by GCC bug #39228 */
#if !defined(__cplusplus) && defined(HAVE_BROKEN_ISINF)
/* Force store/reload of the argument to/from a 64-bit double */
static inline double my_isinf(double x)
{
volatile double t= x;
return isinf(t);
}
#else
/* System-provided isinf() is available and safe to use */
#define my_isinf(X) isinf(X)
#endif
#else /* !HAVE_ISINF */
#define my_isinf(X) (!finite(X) && !isnan(X))
#endif