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I have to download zlib to use in my project. I use externlproject_add() to downaload all zlib repository, build and install it. After it, I want do install a lib that is part of zlib repository: minizip.

How to set this dependency on cmake?

zlib module:

cmake_minimum_required ( VERSION 2.8.7 ) include (ExternalProject) if(UNIX) # An external project for zlib SET (GIT_URL https://github.com/madler/zlib.git) SET (ZLIB_INSTALL ${CMAKE_CURRENT_BINARY_DIR}) SET (ZLIB_INCLUDE ${CMAKE_BINARY_DIR}/include/zlib) SET (ZLIB_STATIC ${CMAKE_BINARY_DIR}/lib/libz.a ) SET (MINIZIP_DIR ${CMAKE_CURRENT_BINARY_DIR}/ZLIB/src/ZLIB/contrib/minizip) ExternalProject_Add(zlib PREFIX zlib GIT_REPOSITORY ${GIT_URL} INSTALL_DIR ${ZLIB_INSTALL} PATCH_COMMAND ${CMAKE_COMMAND} -E remove <SOURCE_DIR>/zconf.h BUILD_IN_SOURCE 1 PATCH_COMMAND "" CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=<INSTALL_DIR> --includedir=${ZLIB_INCLUDE} ) find_package(ZLIB REQUIRED) if(ZLIB_FOUND) add_subdirectory (${MINIZIP_DIR}) endif(ZLIB_FOUND) SET (ZLIB_INCLUDE_DIR ${ZLIB_INSTALL}/include/zlib) SET (ZLIB_LIBRARY "${ZLIB_INSTALL}") ADD_LIBRARY (ZLIB_LIB STATIC IMPORTED DEPENDS zlib) SET_TARGET_PROPERTIES (ZLIB_LIB PROPERTIES IMPORTED_LOCATION "${ZLIB_STATIC}")

endif(UNIX)

With this zlib module I have an error that following directory

/home/lais/Imagens/agent/build/ZLIB/src/ZLIB/contrib/minizip

doesn't exist yet when I run

cmake ..

And it's true. Doesn't exist yet. I should tell cmake it. But I don't know how to do it.

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  • If you expect that find_package finds your ZLIB installation via ExternalProject_Add, you are wrong. At the time when find_package is executed (configuration stage), zlib sources are even not downloaded. See e.g. this question or that one. Same problem with add_subdirectory. Commented May 5, 2017 at 16:30
  • Is it acceptible for you purpose to build minizip using ExternalProject_Add means instead of add_subdirectory? Commented May 5, 2017 at 16:37
  • The zlib project has a CMakeLists.txt file, so you could also consider bringing it into your build in a similar way to the technique mentioned here. Then you wouldn't have to define any of the libraries, etc. manually and you wouldn't have to convert your project to a superbuild arrangement. Commented May 6, 2017 at 23:30
  • 2
    Please, do not add SOLVED into the title. When there is an accepted answer, the question is highlighted as "resolved" automatically. Commented May 8, 2017 at 17:08

1 Answer 1

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I solved it download a zip file that have minizip.

cmake_minimum_required ( VERSION 2.8.7 ) include (ExternalProject) project (zlib) if(UNIX) # An external project for zlib SET (URL http://www.winimage.com/zLibDll/unzip101e.zip) SET (MINIZIP_INSTALL ${CMAKE_CURRENT_BINARY_DIR}) SET (MINIZIP_STATIC ${CMAKE_BINARY_DIR}/lib/minizip.a ) message ("zlib = ${zlib}") ExternalProject_Add(minizip DEPENDS zlib PREFIX minizip URL ${URL} INSTALL_DIR ${MINIZIP_INSTALL} BUILD_IN_SOURCE make CONFIGURE_COMMAND "" ) SET (MINIZIP_LIBRARY "${MINIZIP_INSTALL}") ADD_LIBRARY (MINIZIP_LIB STATIC IMPORTED DEPENDS minizip, zlib) SET_TARGET_PROPERTIES (MINIZIP_LIB PROPERTIES IMPORTED_LOCATION "${MINIZIP_STATIC}") endif(UNIX)
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