CMake获取HOSTNAME环境变量

Question

我同时将HOSTNAME和USER定义为环境变量（Linux Ubuntu）

echo $USER
pvicente
echo $HOSTNAME
glace

我使用以下命令在CMakeLists.txt中获取变量

message("-- USER environment variable is set to: " $ENV{USER})
message("-- HOSTNAME environment variable is set to: " $ENV{HOSTNAME})

但检测到USER而不是HOSTNAME

输出是

-- USER environment variable is set to: pvicente
-- HOSTNAME environment variable is set to:

Answer 1

您可以检查CMake可以看到哪些环境变量

$ cmake -E environment

它在名为的环境变量中提供我的主机名NAME。因此，请尝试：

message("-- USER environment variable is set to: " $ENV{USER})
message("-- HOSTNAME environment variable is set to: " $ENV{NAME})

但是官方的跨平台CMake方式是：

cmake_host_system_information(RESULT _host_name QUERY HOSTNAME)
message("-- _host_name variable is set to: " ${_host_name})

参考