CMAKE_SYSTEM_NAME是空白吗？ [英] CMAKE_SYSTEM_NAME blank?

问题描述

我试图编译Linux（使用Generator Eclipse CDT4 - Ninja ），但是当我检查 $ {CMAKE_SYSTEM_NAME}

I am trying to compile for Linux (with Generator Eclipse CDT4 - Ninja) but when I am checking for ${CMAKE_SYSTEM_NAME} in CMakeLists.txt, all I get is blank.

在哪些情况下使用此变量有效？

In which scenarios is using this variable valid?

使用Debian测试中的cmake 3.02。

Using cmake 3.02 from Debian Testing.

推荐答案

=http://www.cmake.org/cmake/help/v3.0/variable/CMAKE_SYSTEM_NAME.html> CMAKE_SYSTEM_NAME project 命令：

You need to place CMAKE_SYSTEM_NAME after project command:

message("CMAKE_SYSTEM_NAME: ${CMAKE_SYSTEM_NAME}")
project(Foo)
message("CMAKE_SYSTEM_NAME: ${CMAKE_SYSTEM_NAME}")

结果：

CMAKE_SYSTEM_NAME: 
-- The C compiler identification is GNU 4.9.1
...
-- Detecting CXX compiler ABI info - done
CMAKE_SYSTEM_NAME: Linux

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