Hi,

This happened once too often for me: I apply successive tweaks to a CMakeCache 
file, reinvoke make (or ninja) and then at some point lose everything because I 
forgot that changing the compiler is a "lethal" operation.

Why does cmake have to throw away the entire cache file when something changes 
in the compiler path? That seems like a cheap way to implement a "let's keep 
track of which cached settings depend on the choice of compiler". At the least 
it wouldn't be much less cheap to rename CMakeCache.txt to CMakeCache.bak 
instead of deleting it.

And FWIW, this is also a situation in which storing the exact CMake invocation 
in a comment at the top of the cache file could be useful...

R.
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