使用 CMake 的外部项目安装 libcurl4-openssl-dev

Question

目前我的一个项目中有这段代码：

find_package(CURL REQUIRED)
if(${CURL_FOUND})
else(${CURL_FOUND})
    message(STATUS "Could not find libcURL.  This dependency will be downloaded.")
    ExternalProject_Add(
        libcurl
        GIT_REPOSITORY "git://github.com/bagder/curl.git"
        GIT_TAG "1b6bc02fb926403f04061721f9159e9887202a96"
        SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/curl
        PATCH_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/lib/cURL/buildconf
        CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/lib/cURL/configure --prefix=<INSTALL_DIR>
        BUILD_COMMAND ${MAKE}
        UPDATE_COMMAND ""
        INSTALL_COMMAND ""
        LOG_DOWNLOAD ON
        LOG_UPDATE ON
        LOG_CONFIGURE ON
        LOG_BUILD ON
        LOG_TEST ON
        LOG_INSTALL ON
    )
    ExternalProject_Get_Property(libcurl source_dir)
    ExternalProject_Get_Property(libcurl binary_dir)
    set(CURL_SOURCE_DIR ${source_dir})
    set(CURL_BINARY_DIR ${binary_dir})
    set(CURL_LIBRARIES ${CURL_BINARY_DIR}/lib/.libs/libcurl.dylib)
    include_directories(${CURL_SOURCE_DIR})
    set(DEPENDENCIES ${DEPENDENCIES} libcurl)
endif(${CURL_FOUND})

该项目的主要优先事项之一是尽可能容易地为最终用户安装，同时仍然从头开始编译。我对这段代码运行的一个错误是运行 CMake:

时生成以下错误

CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:97 (MESSAGE):
  Could NOT find CURL (missing: CURL_LIBRARY CURL_INCLUDE_DIR)
Call Stack (most recent call first):
  /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:288 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake-2.8/Modules/FindCURL.cmake:52 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:29 (find_package)

出现这个错误是因为libcurl4-openssl-dev没有安装在CMake为运行的系统上。我想知道如何使用 CMake 安装此依赖项。有什么建议吗？

Answer 1

find_package 的 REQUIRED 参数意味着如果找不到包，CMake 将报告错误并停止。看起来你想要的是让 curl 包在你运行 find_package 时不存在，但在必要时下载它。

您可能想要更多类似的东西：

find_package(CURL)

if(NOT ${CURL_FOUND})
    message(WARNING "Could not find libcURL.  This dependency will be downloaded. To avoid this you can install curl yourself using the standard methods for your platform.")

    ...

endif()

使用 CMake 的外部项目安装 libcurl4-openssl-dev

Install libcurl4-openssl-dev using CMake's External Project

installation

dependencies

curl

cmake