On Mon, 2018-12-31 at 13:50 -0500, Donald MacQueen [|] wrote:
> Thanks very much Kyle. I guess I am not real clear about when vars
> should be used as var versus ${var}.
Generally speaking, you use var when setting a variable, and ${var}
when reading its value. It's a lot like how shell variables are used in
bash:
foo=bar
echo $foo
if() and while() break this convention because they were written very
early in CMake's history, before there was a concept of variable
expansion.
However, because of CMP0054, you can put ${var} in quotes:
if("${foo}" STREQUAL "bar")
and it will have the same effect as:
if(foo STREQUAL "bar")
See https://cmake.org/cmake/help/latest/policy/CMP0054.html for
details.
Kyle
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