Fix the build

part3/listing_0074_platform_metrics.cpp

@@ -0,0 +1,98 @@
+/* ========================================================================
+
+   (C) Copyright 2023 by Molly Rocket, Inc., All Rights Reserved.
+   
+   This software is provided 'as-is', without any express or implied
+   warranty. In no event will the authors be held liable for any damages
+   arising from the use of this software.
+   
+   Please see https://computerenhance.com for more information
+   
+   ======================================================================== */
+
+/* ========================================================================
+   LISTING 74
+   ======================================================================== */
+
+#if _WIN32
+
+#include <intrin.h>
+#include <windows.h>
+
+static u64 GetOSTimerFreq(void)
+{
+	LARGE_INTEGER Freq;
+	QueryPerformanceFrequency(&Freq);
+	return Freq.QuadPart;
+}
+
+static u64 ReadOSTimer(void)
+{
+	LARGE_INTEGER Value;
+	QueryPerformanceCounter(&Value);
+	return Value.QuadPart;
+}
+
+#else
+
+#include <x86intrin.h>
+#include <sys/time.h>
+
+static u64 GetOSTimerFreq(void)
+{
+	return 1000000;
+}
+
+static u64 ReadOSTimer(void)
+{
+	// NOTE(casey): The "struct" keyword is not necessary here when compiling in C++,
+	// but just in case anyone is using this file from C, I include it.
+	struct timeval Value;
+	gettimeofday(&Value, 0);
+	
+	u64 Result = GetOSTimerFreq()*(u64)Value.tv_sec + (u64)Value.tv_usec;
+	return Result;
+}
+
+#endif
+
+/* NOTE(casey): This does not need to be "inline", it could just be "static"
+   because compilers will inline it anyway. But compilers will warn about 
+   static functions that aren't used. So "inline" is just the simplest way 
+   to tell them to stop complaining about that. */
+inline u64 ReadCPUTimer(void)
+{
+	// NOTE(casey): If you were on ARM, you would need to replace __rdtsc
+	// with one of their performance counter read instructions, depending
+	// on which ones are available on your platform.
+	
+	return __rdtsc();
+}
+
+static u64 EstimateCPUTimerFreq(void)
+{
+	u64 MillisecondsToWait = 100;
+	u64 OSFreq = GetOSTimerFreq();
+
+	u64 CPUStart = ReadCPUTimer();
+	u64 OSStart = ReadOSTimer();
+	u64 OSEnd = 0;
+	u64 OSElapsed = 0;
+	u64 OSWaitTime = OSFreq * MillisecondsToWait / 1000;
+	while(OSElapsed < OSWaitTime)
+	{
+		OSEnd = ReadOSTimer();
+		OSElapsed = OSEnd - OSStart;
+	}
+	
+	u64 CPUEnd = ReadCPUTimer();
+	u64 CPUElapsed = CPUEnd - CPUStart;
+	
+	u64 CPUFreq = 0;
+	if(OSElapsed)
+	{
+		CPUFreq = OSFreq * CPUElapsed / OSElapsed;
+	}
+	
+	return CPUFreq;
+}

part3/repetition_tester.c

@@ -1,7 +1,9 @@
 #include <stdbool.h>
+#include <stdio.h>
 #include <Windows.h>
 
 #include "base.h"
+#include "listing_0074_platform_metrics.cpp"
 #include "base.c"
 
 int main()