From 88b935bb0c0c31523fa34cbec389b8200d91a8c9 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Marcin=20=C5=9Alusarz?= <marcin.slusarz@intel.com>
Date: Mon, 24 Aug 2020 21:13:50 +0200
Subject: [PATCH] mesa: fix formatting of messages printed using _mesa_log
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... on BOTH _WIN32 and !_WIN32

Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6443>
---
 src/mesa/main/errors.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/mesa/main/errors.c b/src/mesa/main/errors.c
index 91988f183f8..02517c1c407 100644
--- a/src/mesa/main/errors.c
+++ b/src/mesa/main/errors.c
@@ -86,7 +86,10 @@ output_if_debug(const char *prefixString, const char *outputString,
        * visible, so communicate with the debugger instead */
       {
          char buf[4096];
-         snprintf(buf, sizeof(buf), "%s: %s%s", prefixString, outputString, newline ? "\n" : "");
+         if (prefixString)
+            snprintf(buf, sizeof(buf), "%s: %s%s", prefixString, outputString, newline ? "\n" : "");
+         else
+            snprintf(buf, sizeof(buf), "%s%s", outputString, newline ? "\n" : "");
          OutputDebugStringA(buf);
       }
 #endif
@@ -399,7 +402,7 @@ _mesa_log(const char *fmtString, ...)
    va_start(args, fmtString);
    vsnprintf(s, MAX_DEBUG_MESSAGE_LENGTH, fmtString, args);
    va_end(args);
-   output_if_debug("", s, GL_FALSE);
+   output_if_debug(NULL, s, GL_FALSE);
 }
 
 
-- 
2.30.2