Assembly Language Reimagined: Programming the Intel x64 Microprocessor in Linux

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2025

J. SchwartzmanAssembly Language Reimaginedhttps://doi.org/10.1007/979-8-8688-1724-3_6

6. Conditional Compilation and Conditional Build

John Schwartzman¹  

(1)

Ellicott City, MD, USA

 

We’ll now consider how to assemble, compile, and build a specific version of a program. The file minmax.c (Listing 6-1) contains code that makes it compile differently based on whether or not the variable C_VERSION is defined at build time. If C_VERSION is defined, lines 12–25 are compiled, otherwise lines 28–29 are compiled. The main() function gets its definition of printMin and printMax based on which section is active. If C_VERSION is defined, min and max are defined as macros, ...