[LLVMdev] LLVM on MinGW

[Anton Korobeynikov]

Alain,

> Thanks. However, I'm specifically interested in using the MinGW compiler 
> shipped with Cygwin (i.e. "gcc -mno-cygwin") and using Cygwin tools 
> (make, ...). Of course, I could probably install MSYS/MinGW just to 
> compile LLVM and produce the libraries.
The short answer is: don't use cygwin shell with mingw compiler to build
LLVM. Reason actually is: LLVM uses tablgen in it's build process.
Tablegen is compiled with mingw for you, thus it won't work in cygwin
shell without some extra hacks.

There are two possibilities: 
1. Use the hack used to cross-compilation of LLVM. In this case you'll
need cygwin-built tablgen. However, this won't work out-of-the-box,
because both tablegens will share the same extension. This process is
described in http://llvm.org/docs/GettingStarted.html#cross-compile

2. Feed all the paths to tablegen via cygdrive program. In this case
you'll need to tweak build system in several places:
 - Detect, if you're really building mingw-on-cygwin
 - Detect, where cygpath is located
 - Feed paths provided to tablegen via cygdrive

There probably is possibility, that paths in some other places need to
be handled in the same fashion.

-- 
With best regards, Anton Korobeynikov.

Faculty of Mathematics & Mechanics, Saint Petersburg State University.