Put more information about failed tests into the test return codes.

[gnulib.git] / m4 / isfinite.m4

diff --git a/m4/isfinite.m4 b/m4/isfinite.m4
index dfdbc3e..3aeab39 100644 (file)
--- a/m4/isfinite.m4
+++ b/m4/isfinite.m4
@@ -1,4 +1,4 @@
-# isfinite.m4 serial 7
+# isfinite.m4 serial 8
 dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -68,19 +68,23 @@ static long double NaNl ()
 #endif
 int main ()
 {
-  memory_long_double m;
-  unsigned int i;
+  int result = 0;
 
-  /* The isfinite macro should be immune against changes in the sign bit and
-     in the mantissa bits.  The xor operation twiddles a bit that can only be
-     a sign bit or a mantissa bit (since the exponent never extends to
-     bit 31).  */
-  m.value = NaNl ();
-  m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
-  for (i = 0; i < NWORDS; i++)
-    m.word[i] |= 1;
-  if (isfinite (m.value))
-    return 1;
+  {
+    memory_long_double m;
+    unsigned int i;
+
+    /* The isfinite macro should be immune against changes in the sign bit and
+       in the mantissa bits.  The xor operation twiddles a bit that can only be
+       a sign bit or a mantissa bit (since the exponent never extends to
+       bit 31).  */
+    m.value = NaNl ();
+    m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+    for (i = 0; i < NWORDS; i++)
+      m.word[i] |= 1;
+    if (isfinite (m.value))
+      result |= 1;
+  }
 
 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
 /* Representation of an 80-bit 'long double' as an initializer for a sequence
@@ -99,14 +103,14 @@ int main ()
     static memory_long_double x =
       { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
     if (isfinite (x.value))
-      return 1;
+      result |= 2;
   }
   {
     /* Signalling NaN.  */
     static memory_long_double x =
       { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
     if (isfinite (x.value))
-      return 1;
+      result |= 2;
   }
   /* The isfinite macro should recognize Pseudo-NaNs, Pseudo-Infinities,
      Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
@@ -119,35 +123,35 @@ int main ()
     static memory_long_double x =
       { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
     if (isfinite (x.value))
-      return 1;
+      result |= 4;
   }
   { /* Pseudo-Infinity.  */
     static memory_long_double x =
       { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
     if (isfinite (x.value))
-      return 1;
+      result |= 8;
   }
   { /* Pseudo-Zero.  */
     static memory_long_double x =
       { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
     if (isfinite (x.value))
-      return 1;
+      result |= 16;
   }
   { /* Unnormalized number.  */
     static memory_long_double x =
       { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
     if (isfinite (x.value))
-      return 1;
+      result |= 32;
   }
   { /* Pseudo-Denormal.  */
     static memory_long_double x =
       { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
     if (isfinite (x.value))
-      return 1;
+      return |= 64;
   }
 #endif
 
-  return 0;
+  return result;
 }]])], [gl_cv_func_isfinitel_works=yes], [gl_cv_func_isfinitel_works=no],
       [case "$host_cpu" in
                                # Guess no on ia64, x86_64, i386.