Cmake project set LANGUAGES from variable

Question

currently I've got the following project definition :

set(supported_languages "CXX OBJC OBJCXX")

project(
  myProj
  VERSION ${ver}
  LANGUAGES ${supported_languages})

where supported_languages is defined as string of parameters delimited by space (i.e. CXX OBJC OBJCXX)

However, it fails since cmake expect to get a list and this is the error I get

CMake Error: Could not find cmake module file: CMakeDetermineCXX OBJC OBJCXXCompiler.cmake

So I've tried to convert it to list list(${supported_languages}) but it still doesn't work.

I wonder what is the best practice to make it work ?

Offtopic: what is rationale to have list of languages in separate variable? — Marek R
– Marek R, Commented Mar 9, 2022 at 10:38

long.kl · Accepted Answer · 2022-03-09 10:01:36Z

2

that error is because (") characterer lets try this

set(supported_languages CXX OBJC OBJCXX)

project(
  myProj
  VERSION ${ver}
  LANGUAGES ${supported_languages})

answered Mar 9, 2022 at 10:01

long.kl

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2 Comments

Zohar81 Over a year ago

Sounds good, but what if i want to append items to supported_languages ? perhaps you can extend your example with appending additional values ?

long.kl Over a year ago

unfortunately, I tried with passing argument method but it don't work, cmake have some type of variable and none of them help to resolve extending like you want, . cmake.org/cmake/help/v3.0/command/set.html

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