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
1,063721
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
1,063721
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
1,063721
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
1,063721
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,063721
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,063721
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,063721
asked Nov 13 '18 at 10:09
Frank-Rene SchäferFrank-Rene Schäfer
1,063721
1,063721
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
10.2k1527
add a comment |
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1 Answer
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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
10.2k1527
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
10.2k1527
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
10.2k1527
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
10.2k1527
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
10.2k1527
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
10.2k1527
answered Nov 13 '18 at 10:18
Kamil CukKamil Cuk
10.2k1527
10.2k1527
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