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This commit is contained in:
Alexey Kopytov 2009-03-25 16:20:38 +03:00
commit aa6c879944
2 changed files with 34 additions and 3 deletions
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21
configure.in
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@ -2085,6 +2085,27 @@ esac
AC_MSG_CHECKING(for isinf in <math.h>)
AC_TRY_LINK([#include <math.h>], [float f = 0.0; int r = isinf(f); return r],
AC_MSG_RESULT(yes)
AC_MSG_CHECKING(whether isinf() is safe to use in C code)
AC_TRY_RUN([
#include <math.h>
int main()
{
double a= 10.0;
double b= 1e308;
return !isinf(a * b);
}
],
[AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)
AC_DEFINE([HAVE_BROKEN_ISINF], [1],
[Define to 1 if isinf() uses 80-bit register for intermediate values])
],
[
# Let's be optimistic when cross-compiling, since the only compiler known
# to be affected by this isinf() bug is GCC 4.3 on 32-bit x86.
AC_MSG_RESULT([[cross-compiling, assuming 'yes']])
])
AC_MSG_CHECKING(whether isinf() can be used in C++ code)
AC_LANG_SAVE
AC_LANG_CPLUSPLUS

16
include/my_global.h
View file

@ -905,10 +905,20 @@ 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
#define my_isinf(X) (!isfinite(X) && !isnan(X))
/* 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
/* Define missing math constants. */