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Noob question - Does gcc use LLVM anywhere under the hood or it has its own code generation and optimization pipeline? How does it stack in comparison to LLVM?
by wg0 6mo ago
Noob question - Does gcc use LLVM anywhere under the hood or it has its own code generation and optimization pipeline? How does it stack in comparison to LLVM?
- kelnos 6mo agoGCC far far far predates LLVM. They do not share code.
- fweimer 6mo agoThe libsanitizer library is imported from the LLVM sources into the GCC source tree. There are probably more examples of code sharing. Both projects are quite large.
- steve1977 6mo agoI would assume the code sharing is one-way only due to the licenses. I.e. a GPL project can use MIT licensed code, but not vice versa (AFAIK).
- mshockwave 6mo ago> Does gcc use LLVM anywhere under the hood No
- kouosi 6mo ago> Does gcc use LLVM anywhere under the hood or it has its own code generation and optimization pipeline? No it doesn't use LLVM > How does it stack in comparison to LLVM? Well it support more targets then LLVM and in most cases it generates similar if not better executable.
- sintax 6mo agoLet me wikipedia that for you :-) Like people mentioned already, gcc predates LLVM by quite some years, ie. Wikipedia mentions March 22, 1987 for gcc, while LLVM's initial release was 2003. A big difference between the 2 is also the license. GCC uses the GPL while LLVM uses Apache License, hence the projects don't share code.
- ksherlock 6mo agoThe other answers (NO!) are correct, but... there was a gcc plug-in to use the llvm backend with gcc. Apple used llvm-gcc (circa 2012; gcc front end, llvm back end) while transitioning from gcc to llvm. https://dragonegg.llvm.org https://dragonegg.llvm.org