Arrange to only output each symbol once into global.sym

p4raw-id: //depot/perl@25923

diff --git a/embed.pl b/embed.pl
index a88016c..2ef42aa 100755 (executable)
--- a/embed.pl
+++ b/embed.pl
@@ -243,20 +243,27 @@ sub write_protos {
     $ret;
 }
 
-# generates global.sym (API export list), and populates %global with global symbols
-sub write_global_sym {
-    my $ret = "";
-    if (@_ > 1) {
-       my ($flags,$retval,$func,@args) = @_;
-       if ($flags =~ /[AX]/ && $flags !~ /[xm]/
-           || $flags =~ /b/) { # public API, so export
-           $func = "Perl_$func" if $flags =~ /[pbX]/;
-           $ret = "$func\n";
-       }
-    }
-    $ret;
+# generates global.sym (API export list)
+{
+  my %seen;
+  sub write_global_sym {
+      my $ret = "";
+      if (@_ > 1) {
+         my ($flags,$retval,$func,@args) = @_;
+         # If a function is defined twice, for example before and after an
+         # #else, only process the flags on the first instance for global.sym
+         return $ret if $seen{$func}++;
+         if ($flags =~ /[AX]/ && $flags !~ /[xm]/
+             || $flags =~ /b/) { # public API, so export
+             $func = "Perl_$func" if $flags =~ /[pbX]/;
+             $ret = "$func\n";
+         }
+      }
+      $ret;
+  }
 }
 
+
 our $unflagged_pointers;
 walk_table(\&write_protos,     "proto.h", undef, "/* ex: set ro: */\n");
 warn "$unflagged_pointers pointer arguments to clean up\n" if $unflagged_pointers;