Why is the CMakeLists.txt installing the ranges library?

[theShmoo]

I am using CMake Fetch to include the ranges library into my project. As it is header only I don't need to install it. But it is installed automatically as install is called in the root CMakeLists.txt

• Why do we need this?
• Should we add a CMake option for installing it as many other libraries do?

Thanks!

[theShmoo]

Fixed the issue by adding EXCLUDE_FROM_ALL in my fetch:

message(STATUS "Fetch range")

FetchContent_Declare(
  range-v3
  URL https://github.com/ericniebler/range-v3/archive/refs/tags/0.11.0.tar.gz
)

FetchContent_GetProperties(range-v3)
if (NOT range-v3_POPULATED)
  FetchContent_Populate(range-v3)
  add_subdirectory(${range-v3_SOURCE_DIR} ${range-v3_BINARY_DIR} EXCLUDE_FROM_ALL)
  target_include_directories(range-v3 SYSTEM INTERFACE $<BUILD_INTERFACE:${range-v3_SOURCE_DIR}/include>)
endif ()

[starball5]

Note: CMake v3.25 has a new SYSTEM target property and accompanying arguments to FetchContent and add_subdirectory.