CMake: Howto modify a variable from inside a function
What is the best practice to modify a caller's variable from inside a CMake-function.
Assume
function(MyFunction IN_OUT_NAME)
... what to do here ...
string(APPEND $IN_OUT_NAME " and that")
... what to do here ...
endfunction()
What needs to be done such that the following code fragment
set(MY_MESSAGE "this")
MyFunction(MY_MESSAGE)
message($MY_MESSAGE)
delivers
this and that
Not-a-duplicate-remarks:
Modify a variable inside a function is about JavaScript not CMake
Is JavaScript a pass-by-reference or pass-by-value language? is about JavaScript not CMake
function cmake
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,098822
add a comment |
What is the best practice to modify a caller's variable from inside a CMake-function.
Assume
function(MyFunction IN_OUT_NAME)
... what to do here ...
string(APPEND $IN_OUT_NAME " and that")
... what to do here ...
endfunction()
What needs to be done such that the following code fragment
set(MY_MESSAGE "this")
MyFunction(MY_MESSAGE)
message($MY_MESSAGE)
delivers
this and that
Not-a-duplicate-remarks:
Modify a variable inside a function is about JavaScript not CMake
Is JavaScript a pass-by-reference or pass-by-value language? is about JavaScript not CMake
function cmake
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,098822
set(variable $varaible PARENT_SCOPE) ?
– Kamil Cuk
Nov 13 '18 at 10:16
Well, that sets it. But how can I read it?
– Frank-Rene Schäfer
Nov 13 '18 at 10:16
add a comment |
What is the best practice to modify a caller's variable from inside a CMake-function.
Assume
function(MyFunction IN_OUT_NAME)
... what to do here ...
string(APPEND $IN_OUT_NAME " and that")
... what to do here ...
endfunction()
What needs to be done such that the following code fragment
set(MY_MESSAGE "this")
MyFunction(MY_MESSAGE)
message($MY_MESSAGE)
delivers
this and that
Not-a-duplicate-remarks:
Modify a variable inside a function is about JavaScript not CMake
Is JavaScript a pass-by-reference or pass-by-value language? is about JavaScript not CMake
function cmake
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,098822
What is the best practice to modify a caller's variable from inside a CMake-function.
Assume
function(MyFunction IN_OUT_NAME)
... what to do here ...
string(APPEND $IN_OUT_NAME " and that")
... what to do here ...
endfunction()
What needs to be done such that the following code fragment
set(MY_MESSAGE "this")
MyFunction(MY_MESSAGE)
message($MY_MESSAGE)
delivers
this and that
Not-a-duplicate-remarks:
Modify a variable inside a function is about JavaScript not CMake
Is JavaScript a pass-by-reference or pass-by-value language? is about JavaScript not CMake
function cmake
function cmake
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,098822
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,098822
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,098822
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,098822
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,098822
1,098822
set(variable $varaible PARENT_SCOPE) ?
– Kamil Cuk
Nov 13 '18 at 10:16
Well, that sets it. But how can I read it?
– Frank-Rene Schäfer
Nov 13 '18 at 10:16
add a comment |
set(variable $varaible PARENT_SCOPE) ?
– Kamil Cuk
Nov 13 '18 at 10:16
Well, that sets it. But how can I read it?
– Frank-Rene Schäfer
Nov 13 '18 at 10:16
set(variable $varaible PARENT_SCOPE) ?
– Kamil Cuk
Nov 13 '18 at 10:16
set(variable $varaible PARENT_SCOPE) ?
– Kamil Cuk
Nov 13 '18 at 10:16
Well, that sets it. But how can I read it?
– Frank-Rene Schäfer
Nov 13 '18 at 10:16
Well, that sets it. But how can I read it?
– Frank-Rene Schäfer
Nov 13 '18 at 10:16
add a comment |
1 Answer
1
active
oldest
votes
Just use PARENT_SCOPE to export the value to parent scope.
function(MyFunction IN_OUT_NAME)
string(APPEND $IN_OUT_NAME " and that")
set($IN_OUT_NAME "$$IN_OUT_NAME" PARENT_SCOPE)
endfunction()
set(MY_MESSAGE "this")
MyFunction(MY_MESSAGE)
message($MY_MESSAGE)
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
12.4k1529
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Just use PARENT_SCOPE to export the value to parent scope.
function(MyFunction IN_OUT_NAME)
string(APPEND $IN_OUT_NAME " and that")
set($IN_OUT_NAME "$$IN_OUT_NAME" PARENT_SCOPE)
endfunction()
set(MY_MESSAGE "this")
MyFunction(MY_MESSAGE)
message($MY_MESSAGE)
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
12.4k1529
add a comment |
Just use PARENT_SCOPE to export the value to parent scope.
function(MyFunction IN_OUT_NAME)
string(APPEND $IN_OUT_NAME " and that")
set($IN_OUT_NAME "$$IN_OUT_NAME" PARENT_SCOPE)
endfunction()
set(MY_MESSAGE "this")
MyFunction(MY_MESSAGE)
message($MY_MESSAGE)
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
12.4k1529
add a comment |
Just use PARENT_SCOPE to export the value to parent scope.
function(MyFunction IN_OUT_NAME)
string(APPEND $IN_OUT_NAME " and that")
set($IN_OUT_NAME "$$IN_OUT_NAME" PARENT_SCOPE)
endfunction()
set(MY_MESSAGE "this")
MyFunction(MY_MESSAGE)
message($MY_MESSAGE)
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
12.4k1529
Just use PARENT_SCOPE to export the value to parent scope.
function(MyFunction IN_OUT_NAME)
string(APPEND $IN_OUT_NAME " and that")
set($IN_OUT_NAME "$$IN_OUT_NAME" PARENT_SCOPE)
endfunction()
set(MY_MESSAGE "this")
MyFunction(MY_MESSAGE)
message($MY_MESSAGE)
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
12.4k1529
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
12.4k1529
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
12.4k1529
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
12.4k1529
12.4k1529
add a comment |
add a comment |
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set(variable $varaible PARENT_SCOPE) ?
– Kamil Cuk
Nov 13 '18 at 10:16
Well, that sets it. But how can I read it?
– Frank-Rene Schäfer
Nov 13 '18 at 10:16