How do I add a library path in cmake

Question

I have 2 folders  inc  and  lib  in my project which have headers and static libs respectively  How do I tell cmake to use those 2 directories for include and linking respectively

User · Answer

You had better use find library command instead of link directories  Concretely speaking there are two ways   designate the path within the command find library NAMES gtest PATHS path1 path2     pathN   set the variable CMAKE LIBRARY PATH set CMAKE LIBRARY PATH path1 path2  find library NAMES gtest    the reason is as flowings   Note This command is rarely necessary and should be avoided where there are other choices  Prefer to pass full absolute paths to libraries where possible  since this ensures the correct library will always be linked  The find library   command provides the full path  which can generally be used directly in calls to target link libraries    Situations where a library search path may be needed include  Project generators like Xcode where the user can switch target architecture at build time  but a full path to a library cannot be used because it only provides one architecture  i e  it is not a universal binary   Libraries may themselves have other private library dependencies that expect to be found via RPATH mechanisms  but some linkers are not able to fully decode those paths  e g  due to the presence of things like  ORIGIN   If a library search path must be provided  prefer to localize the effect where possible by using the target link directories   command rather than link directories    The target-specific command can also control how the search directories propagate to other dependent targets

User · Answer

The simplest way of doing this would be to add  include directories   CMAKE SOURCE DIR  inc  link directories   CMAKE SOURCE DIR  lib   add executable foo   FOO SRCS   target link libraries foo bar    libbar so is found in   CMAKE SOURCE DIR  lib   The modern CMake version that doesn t add the -I and -L flags to every compiler invocation would be to use imported libraries   add library bar SHARED IMPORTED    or STATIC instead of SHARED set target properties bar PROPERTIES   IMPORTED LOCATION    CMAKE SOURCE DIR  lib libbar so    INTERFACE INCLUDE DIRECTORIES    CMAKE SOURCE DIR  include libbar     set FOO SRCS  foo cpp   add executable foo   FOO SRCS   target link libraries foo bar    also adds the required include path   If setting the INTERFACE INCLUDE DIRECTORIES doesn t add the path  older versions of CMake also allow you to use target include directories bar PUBLIC  path to include   However  this no longer works with CMake 3 6 or newer

User · Answer

might fail working with link directories  then add each static library like following  target link libraries foo  path to static library libbar a

[c++] How do I add a library path in cmake?

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