[LLVMdev] creating new llvm project?

[Matthew O'Connor]

Only my first question (the one about CMake) was answered. Would someone be
willing to answer my other questions so I can understand & pursue that
route instead?


On Mon, Aug 12, 2013 at 2:19 PM, Matthew O'Connor
<thegreendragon at gmail.com>wrote:

> Hi all,
>
> I'm in the process of creating a new LLVM project based on the
> instructions from http://llvm.org/docs/Projects.html.
>
> I have a bunch of questions:
>
>   1. What is the relationship between CMake and the configure + Makefile
> build systems for LLVM? If I intend to just use configure + Makefile, do I
> need to worry about any of the CMake stuff?
>
>   2. My first attempt was to copy the sample project, tweak the autoconf
> stuff, and remake. I ended up getting the follow error:
>     llvm[2]: Linking Release+Asserts executable exe (without symbols)
>     llvm/Release+Asserts/lib/libLLVMSupport.a(Process.o): In function
> `llvm::sys::Process::FileDescriptorHasColors(int)':
>     Process.cpp:(.text+0x525): undefined reference to `setupterm'
>     Process.cpp:(.text+0x52e): undefined reference to `has_colors'
>   It appears that the sample project doesn't contain a library dependency
> on vterm. In comparing the autoconf in sample with the one at the parent of
> LLVM, the sample one doesn't contain references to vterm. Is this
> intentional?
>
>   3. I decided to go the "simple" route of just hardcoding a Makefile that
> includes a Makefile.common that I wrote that hardcode defines
> LLVM_SRC_ROOT, LLVM_OBJ_ROOT, etc.
>   When I did this, I got an error about a missing configure, so I added
> one. My next build complained about a missing config.status, so I added
> one. Neither of them do anything.
>   At this point, I was able to build my library & tool without any issues.
>   Is the intention that only configure exists in the source repository and
> that running it creates the config.status script?
>   Is the intention of the config.status script that it recreates a
> configuration based on how it was configured?
>
>   4. I find all of the autoconf stuff somewhat confusing & overwhelming.
> I'd like to find a simpler configure script that does the appropriate
> variable substitution in my Makefile.common. Is there a reasonable example
> of that? Or would it be better to learn how to properly generate the
> autoconf configure scripts?
>
> Thanks,
> Matthew
>
>
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