llvm dev - Feb 2021 - Moving to a new machine

Unless everything is installed in the same location, copying the
CMakeCache.txt likely won't work, as it includes things like paths to
compilers in it, if I remember rightly. I've used diffs to try to identify
which variables I've set before, but in practice, I end up just memorizing
the three or four variables I tend to change from the defaults.

James

On Tue, 23 Feb 2021 at 22:06, Paul C. Anagnostopoulos via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> I've edited CMakeCache.txt so many times that I have no idea what to
> specify on the 'cmake' command line. Should I just guess, run
cmake, copy
> my existing file on top of CMakeCache.txt, and run cmake again?
>
> At 2/23/2021 04:46 PM, Stefanos Baziotis wrote:
> >Hi Paul,
> >
> >Maybe I missed something but why do you need to copy directories if you
> want to build from scratch?
> >Just use the same CMake arguments you used in the original build.
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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I wrote a short bash script to invoke cmake with all the things I always want. 
Don’t need to waste valuable neurons on remembering these things.
--paulr

From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of James
Henderson via llvm-dev
Sent: Wednesday, February 24, 2021 3:56 AM
To: Paul C. Anagnostopoulos <paul at windfall.com>
Cc: llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Moving to a new machine

Unless everything is installed in the same location, copying the CMakeCache.txt
likely won't work, as it includes things like paths to compilers in it, if I
remember rightly. I've used diffs to try to identify which variables
I've set before, but in practice, I end up just memorizing the three or four
variables I tend to change from the defaults.

James

On Tue, 23 Feb 2021 at 22:06, Paul C. Anagnostopoulos via llvm-dev <llvm-dev
at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
I've edited CMakeCache.txt so many times that I have no idea what to specify
on the 'cmake' command line. Should I just guess, run cmake, copy my
existing file on top of CMakeCache.txt, and run cmake again?

At 2/23/2021 04:46 PM, Stefanos Baziotis wrote:
>Hi Paul,
>
>Maybe I missed something but why do you need to copy directories if you want
to build from scratch?
>Just use the same CMake arguments you used in the original build.
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At 2/24/2021 03:56 AM, James Henderson wrote:
>Unless everything is installed in the same location, copying the
CMakeCache.txt likely won't work, as it includes things like paths to
compilers in it, if I remember rightly. I've used diffs to try to identify
which variables I've set before, but in practice, I end up just memorizing
the three or four variables I tend to change from the defaults.
Ah, another good point. Thanks, everyone, for your help with this.

While I've got you, one more question. I've cloned llvm_project on my
new machine. I have only one branch that is interesting on my old machine. What
is the safest way to bring the files committed on that branch over to the new
machine and make a branch with them?

At 2/24/2021 03:56 AM, James Henderson wrote:
>Unless everything is installed in the same location, copying the
CMakeCache.txt likely won't work, as it includes things like paths to
compilers in it, if I remember rightly. I've used diffs to try to identify
which variables I've set before, but in practice, I end up just memorizing
the three or four variables I tend to change from the defaults.
Of course I'm not done with questions.

When I run CMake, it complains that it cannot find the C, C++, and ASM
compilers. I don't recall this problem before. I have Visual Studio
installed, but CMake isn't finding it.

If it matters, my build directory is not on the C drive. I'm using Ninja to
build.