附加到 CMAKE_C_FLAGS

2021-12-26 00:00:00 c cmake c++ compiler-flags linker-flags

我将 CMake 用于一个有两个版本的项目，其中一个需要 -lglapi，另一个不需要.

I'm using CMake for a project that comes in two versions, one of which requires -lglapi and the other does not.

到目前为止，我们使用的行看起来像这样:

So far the lines we used look like that: 

SET(CMAKE_C_FLAGS "-O3 -xSSE3 -restrict -lpthread -lX11 -ldrm")
SET(CMAKE_CXX_FLAGS "-O3 -xSSE3 -restrict -lpthread -lX11 -ldrm")

我在 CMakeList.txt 的这些行之后添加了一个 if 语句:

I added an if statement in my CMakeList.txt exactly after those lines: 

if(SINGLE_MODE)
    SET(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} " -lglapi")
    SET(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} " -lglapi")
endif(SINGLE_MODE)

SINGLE_MODE 变量的定义稍微高一些.当我使用 message 命令显示标志变量的内容时，它看起来没问题:

The SINGLE_MODE variable is defined a little up. When I use the message command to display the content of the flag variables it looks alright:

-O3 -xSSE3 -restrict -lpthread -lX11 -ldrm -lglapi

但是当我开始编译时，我遇到了编译错误.使用详细模式我意识到在编译器调用中它看起来像这样:

But when I start compiling I am running into a compile error. Using the verbose mode I realized that in the compiler call it looks like that: 

-O3 -xSSE3 -restrict -lpthread -lX11 -ldrm; -lglapi

即在将 -lglapi 添加到列表之前，以某种方式添加了分号.

I.e. somehow a semicolon got added before adding the -lglapi to the list.

这里有没有人遇到过类似的问题并且知道解决这个问题的方法?我已经用谷歌搜索了一段时间并研究了 CMake 手册，但看不到我在这里做错了什么.

Did anyone here encounter a similar issue and knows a way to fix this issue? I've googled quite a while and studied the CMake manual but couldn't see what I did wrong here.

谢谢，托比亚斯

推荐答案

尝试这样做:

if(SINGLE_MODE)
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -lglapi")
    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -lglapi")
endif(SINGLE_MODE)

然后，您确定将 -lglapi 附加到现有的 ${CMAKE_CXX_FLAGS} 字符串.否则，看起来像是正在创建 CMake 列表.

Then, you are sure you append -lglapi to the existing ${CMAKE_CXX_FLAGS} string. Else, looks like something like a CMake list is being created.

相关文章