-# signbit.m4 serial 13
-dnl Copyright (C) 2007-2016 Free Software Foundation, Inc.
+# signbit.m4 serial 16
+dnl Copyright (C) 2007-2018 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
[gl_cv_func_signbit=yes],
[gl_cv_func_signbit=no],
[case "$host_os" in
- # Guess yes on glibc systems.
- *-gnu*) gl_cv_func_signbit="guessing yes" ;;
- # If we don't know, assume the worst.
- *) gl_cv_func_signbit="guessing no" ;;
+ # Guess yes on glibc systems.
+ *-gnu* | gnu*) gl_cv_func_signbit="guessing yes" ;;
+ # Guess yes on native Windows.
+ mingw*) gl_cv_func_signbit="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_signbit="guessing no" ;;
esac
])
])
[gl_cv_func_signbit_gcc=yes],
[gl_cv_func_signbit_gcc=no],
[case "$host_os" in
- # Guess yes on glibc systems.
- *-gnu*) gl_cv_func_signbit_gcc="guessing yes" ;;
- # If we don't know, assume the worst.
- *) gl_cv_func_signbit_gcc="guessing no" ;;
+ # Guess yes on glibc systems.
+ *-gnu* | gnu*) gl_cv_func_signbit_gcc="guessing yes" ;;
+ # Guess yes on mingw, no on MSVC.
+ mingw*) if test -n "$GCC"; then
+ gl_cv_func_signbit_gcc="guessing yes"
+ else
+ gl_cv_func_signbit_gcc="guessing no"
+ fi
+ ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_signbit_gcc="guessing no" ;;
esac
])
])
{
/* More than one bit difference. */
fprintf (fp, "unknown");
+ fclose (fp);
return 2;
}
if (x)
{
/* No difference. */
fprintf (fp, "unknown");
+ fclose (fp);
return 3;
}
/* Now m = plus.word[k] ^ ~minus.word[k]. */
/* Oh? The sign bit is set in the positive and cleared in the negative
numbers? */
fprintf (fp, "unknown");
+ fclose (fp);
return 4;
}
for (i = 0; ; i++)