[PATCH 2/2] rproxy: disable MWRAP+LD_PRELOAD for addr2line

[Eric Wong <mwrap-perl@80x24.org>]

GNU addr2line seems impossibly slow with MWRAP=bt:10 on FreeBSD.
In any case, it's impossible for a single-process rproxy to
inspect it's own addr2line processes; so just disable it.
---
 lib/Devel/Mwrap/Rproxy.pm | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/Devel/Mwrap/Rproxy.pm b/lib/Devel/Mwrap/Rproxy.pm
index c831a36..e2b7097 100644
--- a/lib/Devel/Mwrap/Rproxy.pm
+++ b/lib/Devel/Mwrap/Rproxy.pm
@@ -139,6 +139,13 @@ sub call { # PSGI entry point
 			undef %cache;
 			$cache_exp = $now + $cache_time;
 		}
+
+		# GNU addr2line is slow with high bt:, and FreeBSD addr2line
+		# seems less capable.  And we can't see addr2line in this
+		# anyways since we kill them at the end of this scope.
+		# So just disable MWRAP, here:
+		delete local $ENV{MWRAP};
+		delete local $ENV{LD_PRELOAD};
 		eval {
 			local %addr2line;
 			# extract executable|library(address)