[llvm-dev] Moving to a new machine

[Michael Kruse via llvm-dev]

I am using a shell script that contains the cmake line and that I edit
(&re-run) when I make changes. It also allows me to just delete the
build dir and to start from scratch occasionally.

I think it is useful because as you noticed the CMakeCache.txt does
not indicate which values have been changed from the default, and the
default changes occasionally. For instance, recently the default pass
manager changed to NewPM and I did not notice until I was notified
that the documented workflow does not work anymore and would have to
reset the build directory before I could reproduce it.
 Also, sometimes the host environment changes, e.g. after upgrading
the version of the host compiler which requires running cmake again
(cmake will refuse to re-use a build directory if the compiler
changes).

Michael

Am Di., 23. Feb. 2021 um 16:06 Uhr schrieb Paul C. Anagnostopoulos via
llvm-dev <llvm-dev at lists.llvm.org>:
>
> 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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