Eric Noulard wrote:
If so, I still don't quite get the usage pattern in, e.g.,
CheckIncludeFile.cmake. What are they trying to check?
Better ask the author of this file :-)
This was a hack left from before the 'DEFINED' option was
available from the if() command. The code
if(VAR MATCHES "^VAR$")
is almost equivalent to
if(NOT DEFINED VAR)
because the if() command replaces VAR with ${VAR} implicitly
when VAR is defined (but '^VAR$' is not defined and does not
get replaced). The implicit conversion is left from *very*
early CMake when there was no ${} syntax.
-Brad
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