如何将环境变量传递给ExternalProject_Add CONFIGURE_COMMAND? [英] How to pass an environment variable to ExternalProject_Add CONFIGURE_COMMAND?

问题描述

我有一个带有autotools项目的第三方库.我想使用ExternalProject_Add来构建库.

I have a third party library with autotools project. I want to use ExternalProject_Add to build the library.

这可以通过以下方式完成:

This can be done the following way:

ExternalProject_Add(project_lib
   SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib
   CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/lib/configure --prefix=${LIB_OUTPUT}
   BINARY_DIR ${CMAKE_CURRENT_SOURCE_DIR}/build
)

现在的问题是我需要将环境变量传递给 configure ，但是我找不到解决方法.

Now the problem is that I need to pass an environment variable to configure but I cannot find a way to do it.

在控制台中，我将通过以下方式进行操作:

In the console I would do it the following way:

CPPFLAGS =-fPIC" ./configure --prefix = output

是否可以通过 ExternalProject_Add/CONFIGURE_COMMAND 将 CPPFLAGS =-fPIC" env传递到 configure ?

Is there a way to pass CPPFLAGS="-fPIC" env to the configure with ExternalProject_Add/CONFIGURE_COMMAND ?

推荐答案

可以通过cmake( cmake --help )执行 configure 命令来完成.="https://gitlab.kitware.com/cmake/cmake/commit/7abd574798f9900abfe502f3941cffaa774062b1" rel ="noreferrer">命令模式:

It can be done by executing configure command through cmake (cmake --help) command mode:

-E                           = CMake command mode.

因此，我们可以直接通过带有环境变量的cmake命令模式来执行它，而不是直接调用 configure :

So instead of calling configure directly we can execute it through cmake command mode with the environment variables:

ExternalProject_Add(project_lib
   SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib
   CONFIGURE_COMMAND ${CMAKE_COMMAND} -E env CPPFLAGS=-fPIC ${CMAKE_CURRENT_SOURCE_DIR}/lib/configure --prefix=${LIB_OUTPUT}
   BINARY_DIR ${CMAKE_CURRENT_SOURCE_DIR}/build
)

[cmake-developers]使用ExternalProject_Add <设置环境/a>

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