From 4d2c7899abace5597a9f5ff1ce34b87e411c8da0 Mon Sep 17 00:00:00 2001
From: Bartosz Taudul <wolf.pld@gmail.com>
Date: Thu, 8 Aug 2019 19:21:39 +0200
Subject: [PATCH] Allow skipping invariant TSC check.

---
 client/TracyProfiler.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/client/TracyProfiler.cpp b/client/TracyProfiler.cpp
index b9de8c1e..225ac1d3 100644
--- a/client/TracyProfiler.cpp
+++ b/client/TracyProfiler.cpp
@@ -286,7 +286,14 @@ static int64_t SetupHwTimer()
     CpuId( regs, 0x80000001 );
     if( !( regs[3] & ( 1 << 27 ) ) ) InitFailure( "CPU doesn't support RDTSCP instruction." );
     CpuId( regs, 0x80000007 );
-    if( !( regs[3] & ( 1 << 8 ) ) ) InitFailure( "CPU doesn't support invariant TSC." );
+    if( !( regs[3] & ( 1 << 8 ) ) )
+    {
+        const char* noCheck = getenv( "TRACY_NO_INVARIANT_CHECK" );
+        if( !noCheck || noCheck[0] != '1' )
+        {
+            InitFailure( "CPU doesn't support invariant TSC.\nDefine TRACY_NO_INVARIANT_CHECK=1 to ignore this error, *if you know what you are doing*." );
+        }
+    }
 
     return Profiler::GetTime();
 }