This article is a summary of a YouTube video "Let's get rid of it - Compiling C without the C Runtime" by Dani Crunch

How to Remove the C Runtime Library from Your C Application

TLDRLearn how to remove the C runtime library from your C application to reduce file size and have more control over your code. By using Windows kernel functions directly, you can make your executable smaller and avoid dependencies on specific versions of the C runtime library.

Key insights

📦The C runtime library is automatically linked into C applications and provides necessary functions defined by the C standard.

💡By using Windows kernel functions directly, you can bypass the C runtime library and have more control over your code.

🔒Removing the C runtime library can make your executable smaller and reduce dependencies on specific library versions.

🔨You can replace C library functions like fopen, fread, and puts with equivalent Windows kernel functions.

🧪Disabling default security features like buffer overrun checks may be acceptable in non-security-critical applications.

Q&A

Why would I want to remove the C runtime library from my application?

Removing the C runtime library can reduce your executable's file size, make it more platform-independent, and give you more control over your code.

Does removing the C runtime library affect the portability of my application?

Yes, removing the C runtime library will make your application less reliant on specific library versions and more portable across different platforms.

What functions can I use to replace C library functions?

You can use Windows kernel functions like CreateFile, ReadFile, and WriteConsole as replacements for fopen, fread, and puts, respectively.

Are there any security implications to removing the C runtime library?

Removing the C runtime library may disable security features like buffer overrun checks, so it's important to understand the impact on your application and consider alternative security measures.

Is removing the C runtime library recommended for all C applications?

No, removing the C runtime library is a decision that depends on your specific application's requirements and trade-offs. Consider factors like file size, portability, and security before making the decision.

Timestamped Summary

00:00The C runtime library is automatically linked into C applications and provides necessary functions defined by the C standard.

02:25By using Windows kernel functions directly, you can bypass the C runtime library and have more control over your code.

03:31Removing the C runtime library can make your executable smaller and reduce dependencies on specific library versions.

04:51You can replace C library functions like fopen, fread, and puts with equivalent Windows kernel functions.

09:23Disabling default security features like buffer overrun checks may be acceptable in non-security-critical applications.

13:27Removing the C runtime library can reduce your executable's file size, make it more platform-independent, and give you more control over your code.