CODEWITHSUNDEEP
opencvcmake
Ken Y-N
Ken Y-N

Reputation: 15009

find_package() - use older version if available, else use newer version

There is the standard CMake command:

find_package(OpenCV REQUIRED)

When both v2 and v3 are installed, v3 will be chosen.

Now, due to various issues, I want to use OpenCV v2 if available, but if not, fall forward to OpenCV v3. Unfortunately this is not a valid keyword:

find_package(OpenCV 2 AT_LEAST)

One solution might be:

find_package(OpenCV 2 REQUIRED)
if (NOT OpenCV_FOUND)
    find_package(OpenCV 3 REQUIRED)
endif()

Is there a better way?

Upvotes: 1

Views: 184

Answers (1)

triclosan
triclosan

Reputation: 5714

Some based on your solution

find_package(OpenCV 2 EXACT QUIET)
if (NOT OpenCV_FOUND)
    message(STATUS "OpenCV v2 not found. Trying to find OpenCV v3")
    find_package(OpenCV 3 REQUIRED)
endif()

Upvotes: 2

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