Integrate change #9006 from maintperl to mainline,

more robust quest for the infinite.

p4raw-link: @9006 on //depot/maint-5.6/perl: 056c8b5c3eb77101e8713ae76ced9a4cc39b58ed

p4raw-id: //depot/perl@9007
p4raw-integrated: from //depot/maint-5.6/perl@9004 'copy in'
	lib/Math/Complex.pm (@8723..)

diff --git a/lib/Math/Complex.pm b/lib/Math/Complex.pm
index fb6af8c..9812513 100644 (file)
--- a/lib/Math/Complex.pm
+++ b/lib/Math/Complex.pm
@@ -14,10 +14,20 @@ $VERSION = 1.31;
 BEGIN {
     unless ($^O eq 'unicosmk') {
         my $e = $!;
-       # We do want an arithmetic overflow.
-        eval '$Inf = CORE::exp(CORE::exp(30))';
+       # We do want an arithmetic overflow, Inf INF inf Infinity:.
+        undef $Inf unless eval <<'EOE' and $Inf =~ /^inf(?:inity)?$/i;
+         local $SIG{FPE} = sub {die};
+         my $t = CORE::exp 30;
+         $Inf = CORE::exp $t;
+EOE
+       if (!defined $Inf) {            # Try a different method
+         undef $Inf unless eval <<'EOE' and $Inf =~ /^inf(?:inity)?$/i;
+           local $SIG{FPE} = sub {die};
+           my $t = 1;
+           $Inf = $t + "1e99999999999999999999999999999999";
+EOE
+       }
         $! = $e; # Clear ERANGE.
-        undef $Inf unless $Inf =~ /^inf(?:inity)?$/i; # Inf INF inf Infinity
     }
     $Inf = "Inf" if !defined $Inf || !($Inf > 0); # Desperation.
 }