From ea8480a2493e396715e2fa0709c137b513a680aa Mon Sep 17 00:00:00 2001
From: Andrew Dunstan <andrew@dunslane.net>
Date: Thu, 26 Oct 2017 10:10:37 -0400
Subject: [PATCH] Improve gendef.pl diagnostic on failure to open sym file

There have been numerous buildfarm failures but the diagnostic is
currently silent about the reason for failure to open the file. Let's
see if we can get to the bottom of it.

Backpatch to all live branches.
---
 src/tools/msvc/gendef.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tools/msvc/gendef.pl b/src/tools/msvc/gendef.pl
index 8ccaab35519..04b0bbe6c79 100644
--- a/src/tools/msvc/gendef.pl
+++ b/src/tools/msvc/gendef.pl
@@ -29,7 +29,7 @@ sub dumpsyms
 sub extract_syms
 {
 	my ($symfile, $def) = @_;
-	open(F, "<$symfile") || die "Could not open $symfile for $_\n";
+	open(F, "<$symfile") || die "Could not open $symfile for $_: $!\n";
 	while (<F>)
 	{