[LLVMdev] Can't build clang 3.4.2

[Rodney M. Bates]

On 08/03/2014 05:30 PM, Justin Bogner wrote:
> "Rodney M. Bates" <rodney_bates at lcwb.coop> writes:
>> I can build llvm 3.4.2 fine, using instructions in GettingStarted.html,
>> and making assumptions to account for my using tar files instead of svn.
>> Although I had downloaded and extracted both llvm-3.4.2.src.tar.gz and
>> cfe-3.4.2.src.tar.gz, giving directories llvm-3.4.2.src and cfe-3.4.2.src,
>> clang apparently did not get built.  The only files with names starting
>> with "clang" anywhere inside my llvm directory are Ascii text, C source,
>> or directories.
>>
>> If I run ../cfe-3.4.2.src/make, (in my "build" directory, as suggested), I see:
>>
>> Makefile:42: ../../Makefile.common: No such file or directory
>> make: *** No rule to make target `../../Makefile.common'.  Stop.
>>
>> There is no file by this name anywhere inside cfe-3.4.2.src, nor is there
>> one named configure either.  Merging the files in llvm-3.4.2.src and
>> cfe-3.4.2.src
>> is obviously wrong, since they contain various same-named but different files.
>>
>> GettingStarted.html, get_started.html, the llvm FAQ, two README.txt
>> and one INSTALL.txt
>> have not helped me.
>
> The build system wants the clang directory to be nested inside the llvm
> directory (under tools). I think the SVN instructions make this fairly
> clear, since they tell you where to cd before checking out clang, but I
> guess it's not obvious how that translates to source releases.
>
> Given your llvm directory, you need clang to be found under
> <llvm-dir>/tools/clang, so you can either extract cfe-3.4.2.src in
> tools/ and rename it to clang, or make a symlink to the cfe directory
> beside the llvm one (ie, tools/clang -> ../../../cfe-3.4.2.src)
>
> Hope that helps!
>

Thanks, that got me going.

Rereading the directions in the light of this, do I correctly infer that
I should also move extracted directory compiler-rt-3.4 inside of
llvm-3.4.2.src/llvm/projects and rename it compiler-rt, and likewise
move test-suite-3.4 to the same place and rename it test-suite?

At least part of what confused me about the needed directory structure
was that there was a cfe-3.4.2.src/tools/clang (I tried running make
in there too), but llvm-3.2.4.src/tools contains no clang.

-- 
Rodney Bates
rodney.m.bates at acm.org