Cmake - change where the lib and include directories are for an externalproject and proper linking

问题

cmake_minimum_required(VERSION 3.2.1 FATAL_ERROR)
project("soxy")

add_definitions(-std=c99)

include_directories(soxy)

# Includes
include(ExternalProject)

ExternalProject_Add(
    LibUV
    GIT_REPOSITORY "https://github.com/libuv/libuv.git"
    GIT_TAG "v1.4.2"
    CONFIGURE_COMMAND sh <SOURCE_DIR>/autogen.sh && ./configure --prefix=${CMAKE_CURRENT_SOURCE_DIR}
    PATCH_COMMAND ""
    BUILD_COMMAND "make"
    BUILD_IN_SOURCE 1
    PREFIX ${CMAKE_CURRENT_SOURCE_DIR}/build
)

set( SOXY_SRC src/file_utils.c
     src/http_parser.c
     src/http_request.c
     src/path_utils.c
     src/string_utils.c
)

set( SOXY_HDR src/debug.h
     src/file_utils.h
     src/http_client.h
     src/http_parser.h
     src/http_request.h
     src/logger.h
     src/path_utils.h
     src/soxy_constantsh
     src/soxy.h
     src/string_utils.h
)

set( SOXY_BIN src/soxy.c )

add_executable(soxy ${SOXY_BIN})
add_dependencies(soxy LibUV)

Project structure: /soxy /soxy/CMakeLists.txt /soxy/build/

When I build the makefile and run make, the lib and include for the external project end up in /soxy, I'd like them to show up in /soxy/build/ and when it builds my project it doesn't setup the include right such that #include <uv.h> doesn't work and is an unresolved header file inclusion.

回答1:

You are using --prefix=${CMAKE_CURRENT_SOURCE_DIR}. Try using CMAKE_CURRENT_BINARY_DIR instead.

回答2:

Hmmm, you are getting several things wrong.

You usually don't need to define a list of header files.
You are not telling anywhere to compile the files contained in the SOXY_SRC variable. You would compile them for example if you did add_executable(soxy ${SOXY_BIN} ${SOXY_SRC}).
After add_dependencies you'll also need target_link_libraries.
You should target "out of source" build. That is, you shouldn't have stuff like ${CMAKE_CURRENT_SOURCE_DIR}/build

So, try the following (I don't know the ExternalProject_Add command so I can only guess the behaviour). Modify two lines of ExternalProject_Add like this:

BUILD_IN_SOURCE 0
PREFIX ${CMAKE_BINARY_DIR}/LibUV

And add:

include_directories(${CMAKE_BINARY_DIR}/LibUV)

You'll probably need also

link_directories(${CMAKE_BINARY_DIR}/LibUV)

Ideally the include directory of LibUV is different from the library directory, take a look to what your ExternalProject_Add effictively does.

As said before, you'll probably need a target_link_libraries(soxy uv) or something similar, depending on the generated library name

来源：https://stackoverflow.com/questions/29619032/cmake-change-where-the-lib-and-include-directories-are-for-an-externalproject

标签

cmake