From c0d1354b7da9ffc2923bc102abb67d03b655fbbf Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Fri, 27 Nov 2020 12:17:07 +0100
Subject: [PATCH] Macro hygiene

---
 src/libutil/logging.hh | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/libutil/logging.hh b/src/libutil/logging.hh
index ff17056f4..82ba54051 100644
--- a/src/libutil/logging.hh
+++ b/src/libutil/logging.hh
@@ -191,8 +191,9 @@ extern Verbosity verbosity; /* suppress msgs > this */
    arguments are evaluated lazily. */
 #define printMsg(level, args...) \
     do { \
-        if (level <= nix::verbosity) { \
-            logger->log(level, fmt(args)); \
+        auto __lvl = level; \
+        if (__lvl <= nix::verbosity) { \
+            logger->log(__lvl, fmt(args)); \
         } \
     } while (0)