[llvm-dev] [RFC] Removing autoconf from trunk

[Chris Bieneman via llvm-dev]

> On Jan 12, 2016, at 9:39 AM, Reid Kleckner <rnk at google.com> wrote:
> 
> Sounds like a plan.
> 
> Should we leave behind a simple ./configure script that checks for cmake, and if present, runs something like 'cmake -G"Unix Makefiles" .'? I think it's nice if the "standard" Unix way of building with "./configure && make" keeps working.

My intention had been to leave the configure script having it print an error directing people to CMake. I hesitate to make the configure script to anything other than error out because people like to pass arguments to configure.

Maybe if configure is called with no arguments we do a default build, but if arguments are specified we fail out?

> 
> Also, we should be able to allow in-source cmake builds once we remove the makefiles, right?

Maybe. In source builds will need all conflicting makefiles to be removed, so enabling it before all projects have their makefiles removed might be a bit complicated.

-Chris

> 
> On Tue, Jan 12, 2016 at 9:35 AM, Chris Bieneman via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> Now that 3.8 is imminently branching with the newly deprecated autoconf I think it is time to propose a process and timeline for removing autoconf support from trunk.
> 
> At this point I believe there should be no users of autoconf for Clang and LLVM that are not supported by CMake, so I would like to propose dropping autoconf support from the cfe and llvm repositories on January 26th (two weeks from today). I believe this gives sufficient time for users to migrate any remaining systems off autoconf. If this timeline doesn’t work for you, please speak up.
> 
> There are still some problematic use cases for building the compiler-rt builtins. Specifically bootstrapping cross-compilers is fragile and in some cases entirely unworkable in CMake. To this end I’m not proposing a full removal of the compiler-rt makefiles at this time. What I would like to propose is that on February 2nd we remove autoconf support for all sanitizer runtimes from compiler-rt.
> 
> We will not be removing the makefile build system from the test-suite project. The CMake build system there is very new, and still nowhere near feature complete.
> 
> For other projects (libcxx, libcxxabi, libunwind…) I’ve not made significant contributions to these projects, so I’d like to defer to more active contributors on those projects, but I am unaware of any blocking issues.
> 
> Questions, comments, concerns, panic, fire, brimstone?
> 
> -Chris
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