用gradle构建cmake ExternalProject [英] build cmake ExternalProject with gradle

问题描述

我正在尝试将现有的本机库用作android项目的一部分。我遵循了有关将C和C ++代码添加到android studio项目的说明。我已经到达了一个正常运行的CMakeLists.txt文件（已独立测试）的地步，并指示gradle使用它来编译本机代码。

I am trying to use an existing native library as part of an android project. I followed instructions about adding C and C++ Code to a project for android studio. I got to the point where I have a functioning CMakeLists.txt file (tested independently) and I've instructed gradle to use it to compile the native code.

该库我正在使用make，所以我使用ExternalProject_Add来指示cmake如何编译它。以下是相关代码：

The library I'm using uses make so I use ExternalProject_Add to instruct cmake how to compile it. Here is the relevant code:

ExternalProject_Add(foo
    SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../libfoo
    CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/../libfoo/configure
        --host=arm-linux-androideabi
    BUILD_COMMAND ${MAKE}
    INSTALL_COMMAND true)

这是build.gradle模块的相关部分：

This is the relevant part of the build.gradle for the module:

externalNativeBuild {
    cmake {
        path '../cpp/CMakeLists.txt'
    }
}

当我运行 ./ gradlew assembleDebug 时，不会编译外部项目。在cmake中添加依赖于 foo 的可执行文件（名为 bar ）后，配置步骤将运行，但构建步骤不会没错我修改了库的代码，以使编译将失败，但是gradle无论如何都会返回成功）。

When I run ./gradlew assembleDebug, the external project is not compiled. After adding an executable (named bar) that depends on foo in cmake, the configure step runs but the build step doesn't. I modified the code of the library so that compilation would fail, but gradle returns success anyway).

这是输出的最后几行./gradlew assembleDebug 。

configure: creating ./config.status
config.status: creating Makefile
config.status: executing depfiles commands
[6/10] Performing build step for 'foo'
[7/10] Performing install step for 'foo'
[8/10] Completed 'foo'
[9/10] Building C object CMakeFiles/bar.dir/bar.c.o
[10/10] Linking C executable bar

BUILD SUCCESSFUL in 18s

有什么想法吗？我在做什么错？

Any ideas what is happening? What am I doing wrong?

我正在使用gradle 4.1和cmake 3.6。

I'm using gradle 4.1 and cmake 3.6.

推荐答案

，您应该使用 BUILD_IN_SOURCE ON ，否则您的 BINARY_DIR 在其他地方，因此 make 不会做任何恕我直言。

you should use BUILD_IN_SOURCE ON otherwise your BINARY_DIR is somewhere else so make do nothing IMHO.

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