c++ - How does Cmake find files? -


I'm trying to compile freepv () using CMak.

FreePav requires some modules such as zlib. I download the developer version of this module and copy it to my hard disk.

is included in the semicolon that tells a centimeter where to find the zlib library. 

  ####################################### $ ####### ******** ****************************************************************************************** ********* ** # # This free PVP script attempts to find the header path of the JPEG Library and header file # # ZLIB_INCLUDE_DIR. # # ZLIB_LIBRARIES, requires libraries # # ZLIB_FOUND, either true or false ############################### ################## ######################## if (Win32) Fnd_pth (Zlib_include_dir Zlib .h $ {CMAKE_INCLUDE_PATH} $ ENV {included} set (ZLIB_NAMES z zlib zlib1 zlib1d zdll) FIND_LIBRARY (ZLIB_LIBRARY NAMES $ {ZLIB_NAMES} PATHS $ {CMAKE_LIBRARY_PATH} $ ENV {lib}) ELSE (WIN32) FIND_PHH (ZLIB_INCLUDE_DIR zlib.h / usr / local / include / usr / include) SET (ZLIB_NAMES z zlib zdll) FIND_LIBRARY (ZLIB_LIBRARY NAMES $ {ZLIB_NAMES} PATHS / usr / lib / usr / local / lib) ENDIF (WIN32) IF (ZLIB_INCLUDE_DIR and ZLIB_LIBRARY) SET ( ZLIB_FOUND TRUE) SET (ZLIB_LIBRARIES $ {ZLIB_LIBRARY}) ENDIF (ZLIB_INCLUDE_DIR and ZLIB_LIBRARY) IF (not ZLIB_FOUND) IF (ZLIB_FIND_REQUIRED) message (FATAL_ERROR "could not be found") endif (ZLIB_FIND_REQUIRED) endif O ZLIB_FOUND)   
 Question:  
 Where should I be copied those files that I downloaded to zlib?  
 Can I copy something to my hard disk and then called an Environment variable: ZLIB_INCLUDE_DIR?  
 How does CMake FIND_PATH work?   
 
 
 Did you not tell whether you are on Windows or Linux / UNIX etc., because the above script has two parts To do something differently.  
 Let's start with the non-windows:  
  FIND_PATH (ZLIB_INCLUDE_DIR zlib.h / usr / local / include / usr / include)   
 This only searches for a file named  zlib.h  in the given directory and sets the CMKE variable ZLIB_INCLUDE_DIR to the DIR where the file was found.  
 The same thing happens to libraries, but oddly another way to joke (looks like a bug, imagine that you have zlib in / usr / lib and / usr / local / lib Installed and it is included in two different versions and mixes libraries).  
  set (ZLIB_NAMES z zlib zdll) FIND_LIBRARY (ZLIB_LIBRARY name $ {ZLIB_NAMES} path / usr / lib / usr / local / lib)   
 So The easiest way is to call only  FindZLIB , which works better ... (see).  
 As it strange for the Windows platform:  
  FIND_PATH (ZLIB_INCLUDE_DIR zlib.h include $ {CMAKE_INCLUDE_PATH} $ ENV {})   
 This looks for the  zlib.h  file in the  set in the default directory CMAKE_INCLUDE_PATH (see) and if it does not get there, path in the environment variable  In the set.  
  set (ZLIB_NAMES z zlib zlib1 zlib1d zdll) FIND_LIBRARY (ZLIB_LIBRARY named $ path $ {ZLIB_NAMES} {CMAKE_LIBRARY_PATH} $ ENV {lib})   
 Dll IST similar, just this time CMAKE_LIBRARY_PATH is the content of or the contents of the environment variable LIB.  
 But yes, if you already know the right path, then you can just:  
  SET (ZLIB_INCLUDE_DIR / path / to / the / zlib / include / DIR) SET (ZLIB_LIBRARIES / path / to / the / libary) SET (ZLIB_FOUND true)   
 and ignore the whole code ...

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