CODEWITHSUNDEEP
cmake
nikitablack
nikitablack

Reputation: 4663

How to modify an existing variable?

I want to modify a variable passed to a function. Here's the code I wrote:

FUNCTION(TEST var)
    set(${var} "ABC")
    message(${var}) # 2) 123
    set(${var} "ABC" PARENT_SCOPE)
ENDFUNCTION(TEST)

set(v "123")
message(${v}) # 1) 123
TEST(${v})
message(${v}) # 3) 123

Why all three outputs print 123. I expected #2 and #3 print ABC?

If I pass variable like this - TEST(v) - I have other output: #1 - 123, #2 - v, #3 - ABC. Why is this? What's the difference?

Upvotes: 0

Views: 408

Answers (1)

Florian
Florian

Reputation: 42842

You are passing the content of v to TEST(). So it should be:

FUNCTION(TEST var)
    set(${var} "ABC")
    message(${${var}})
    set(${var} "ABC" PARENT_SCOPE)
ENDFUNCTION(TEST)

set(v "123")
message(${v}) 
TEST(v)
message(${v})

Reference

Upvotes: 1

Related Questions