[cfe-dev] ../../../Makefile.common:60:../../../Makefile.config:don't have that file or directory

[Csaba Raduly via cfe-dev]

Hi,

On Wed, Oct 14, 2015 at 1:55 PM, Q Z via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> I installed LLVM3.7.0  according to the LLVM document. I can use
> "clang","LLVM-dis"commands ,and so on.
> but when I execute commad "make" at llvm/lib/Transform/Hello directory, the
> error is :
> ../../../Makefile.common:60:../../../Makefile.config:don't have that file or
> directory
> ../../../Makefile.common:68:../../../Makefile.rules:don't have that file or
> directory
>
> why?
> can anyone help me?

You can't build LLVM/clang inside its source tree like that. The
makefile in Hello
includes Makefile.common, which includes Makefile.config;
that file doesn't exist inside the "llvm" tree.

To build clang, you need to create a separate directory where to build.
For example, in the llvm directory:

mkdir ../build
cd ../build
../llvm/configure '--enable-optimized' '--enable-assertions'

This will create Makefile.config (among other things) and shadow the
directories in llvm under build,
so there will be a    build/lib/Transforms/Hello   directory. You can
run make there.

Note: This might not work if you only installed binaries and headers for LLVM.
I have all the sources from LLVM, and clang insde it.

Note: You might want to use cmake instead of autoconf.
cmake also needs a separate build directory.

Csaba
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