Use Bash associative array in CMake

Question

I have the need to access a bash associative array element via cmake. So assume that my declaration and access was something like the following in bash:

~ declare -x someText=124 ~ echo $someText 124 ~ declare -A mymap=( [foo]=bar [baz]=quux) ~ echo ${mymap[foo]} bar

Access in CMakeLists.txt would be:

message(STATUS "$ENV{someText}) message(STATUS "$ENV{mymap})

when I run cmake I get the following:

-- 124 --

So, the associative array cannot be accessed via the $ENV{} cmake command. Any ideas how to access it? To be specific, I don't care about the complete associative array, just one element in it.

The bash -c opens a sub-shell, the array mymap defined in the first command won't be available in the second echo — Inian
– Inian, Commented Apr 12, 2018 at 6:23
ok, but even if I get rid of bash -c and I run every command by itself, I get the same message. — Tassos Tzavellas
– Tassos Tzavellas, Commented Apr 12, 2018 at 6:36
@Inian: bash -c opens a chid process, its not a sub-shell. A sub-shell is where existing variables (and other resources) are copied to the child whether they are exported or not. Since the parent (cmake) is not bash then it can't create a bash sub-shell. — cdarke
– cdarke, Commented Apr 12, 2018 at 6:36
@TassosTzavellas: you will, you cannot import a variable value from another process (a shell), let alone another language, without some sort of inter-process communication. — cdarke
– cdarke, Commented Apr 12, 2018 at 6:39

Tsyvarev · Accepted Answer · 2018-04-12 07:57:59Z

CMake cannot access array variables created in a bash shell.

Process cmake doesn't see an array variable - unlike to "normal" variable, array variable isn't part of the environment passed to the process.

Even another bash subprocess doesn't see array variable, see this question.

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