Herbert Xu, a prominent developer at Red Hat, has made headlines by writing a complete compiler from scratch in the POSIX shell. The project, which he calls "C Compiler in POSIX," showcases his deep understanding of programming fundamentals and system-level development.
The compiler is built entirely within the confines of the POSIX environment, leveraging standard libraries and shell scripting techniques. Xu's approach demonstrates how complex systems can be constructed using basic programming constructs, offering insights into low-level software development.
In an interview, Xu highlighted the challenges faced during the project:
#include
int main() {
printf("Hello, world!\n");
return 0;
}
He noted that while the compiler is still in early stages, its core features—such as syntax parsing, semantic analysis, and emission of intermediate code—are working correctly. The project is currently being tested on various platforms, including Linux, macOS, and Windows, with efforts underway to support additional operating systems.
"This is not just a compiler, it's a journey through the heart of computing," Xu said. "I wanted to show people what it's like to build something from scratch, to understand the foundations of programming and system development."