hide private functions with __attribute__((visibility("hidden")))

This allows us to enforce API boundaries and potentially enables
compiler optimisations.

We've been always hiding non-public symbols on Windows. This commit
brings that to the other platforms.

1 files changed, 4 insertions, 0 deletions

diff --git a/regen/embed.pl b/regen/embed.pl
index 09853c63eb..d36eb6c4d2 100755
--- a/regen/embed.pl
+++ b/regen/embed.pl
@@ -241,6 +241,10 @@ my ($embed, $core, $ext, $api) = setup_embed();
         if ( $flags =~ /I/ ) {
             push @attrs, "__attribute__always_inline__";
         }
+        # roughly the inverse of the rules used in makedef.pl
+        if ( $flags !~ /[ACeIimSX]/ ) {
+            push @attrs, '__attribute__visibility__("hidden")'
+        }
         if( $flags =~ /f/ ) {
             my $prefix	= $has_context ? 'pTHX_' : '';
             my ($args, $pat);