diff options
Diffstat (limited to 'm4/frexp.m4')
| -rw-r--r-- | m4/frexp.m4 | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/m4/frexp.m4 b/m4/frexp.m4 index 530fdbcee5..bb9c4390d9 100644 --- a/m4/frexp.m4 +++ b/m4/frexp.m4 @@ -104,12 +104,24 @@ AC_DEFUN([gl_FUNC_FREXP_WORKS], #include <float.h> #include <math.h> #include <string.h> +/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0. + ICC 10.0 has a bug when optimizing the expression -zero. + The expression -DBL_MIN * DBL_MIN does not work when cross-compiling + to PowerPC on MacOS X 10.5. */ +#if defined __hpux || defined __sgi || defined __ICC +static double +compute_minus_zero (void) +{ + return -DBL_MIN * DBL_MIN; +} +# define minus_zero compute_minus_zero () +#else +double minus_zero = -0.0; +#endif int main() { int i; volatile double x; -/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0. - So we use -zero instead. */ double zero = 0.0; /* Test on denormalized numbers. */ for (i = 1, x = 1.0; i >= DBL_MIN_EXP; i--, x *= 0.5) @@ -132,7 +144,7 @@ int main() return 1; } /* Test on negative zero. */ - x = -zero; + x = minus_zero; { int exp; double y = frexp (x, &exp); |