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I am looking for LLVM (or clang) equivalent of gcc's -D flag which enables macro definition at commandline.
Any pointers would be great.
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How Is LLVM Different From GCC? LLVM and the GNU Compiler Collection (GCC) are both compilers. The difference is that GCC supports a number of programming languages while LLVM isn't a compiler for any given language. LLVM is a framework to generate object code from any kind of source code.
You can use Clang instead of GCC as a compiler for any package by overriding stdenv , which contains the compilation toolchain, with: stdenv = pkgs.
The -cc1 argument indicates that the compiler front-end is to be used, and not the driver. The clang -cc1 functionality implements the core compiler functionality. So, simply speaking. If you do not give -cc1 then you can expect the "look&feel" of standard GCC.
The Clang Compiler is an open-source compiler for the C family of programming languages, aiming to be the best in class implementation of these languages. Clang builds on the LLVM optimizer and code generator, allowing it to provide high-quality optimization and code generation support for many targets.
From clang --cc1 --help:
...
-D <macro>=<value> Define <macro> to <value> (or 1 if <value> omitted)
...
As a rule of thumb, assume that Clang emulates GCC, unless proven otherwise!
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