当我调用 CMake 时如何定义变量，以便 qtcreator 知道它已定义？

发布于 2024-12-04 07:40:44 字数 610 浏览 2 评论 0原文

我有一段代码根据 #define 有条件地激活，如下所示：

#ifdef VARIABLE
  code.function();
#endif

cmake 脚本有一个“选项”命令，它设置如下所示的变量：

option(VARIABLE "Want to use VARIABLE?" ON)

if(VARIABLE)
   message(STATUS "VARIABLE")
   set(VARIABLE_FLAG "-DVARIABLE")
endif()

set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${VARIABLE_FLAG} -Wall")

我使用 cmake 来构建项目，并使用 qtcreator 作为 IDE。我的问题是 qtcreator 认为 VARIABLE 没有定义，所以我的代码没有突出显示，但是当我在控制台上构建它时，VARIABLE 被定义了。那么，我应该向 qtcreator 传递哪些参数来运行 cmake，以便它知道 VARIABLE 已定义并突出显示我的代码？有办法做到这一点吗？

Ps：我只是使用 qtcreator 来编辑文件，构建部分是通过控制台命令完成的。

原文

I have a section of code that is conditionally activated depending on a #define, like this:

#ifdef VARIABLE
  code.function();
#endif

The cmake script has an 'options' command that sets the VARIABLE like this:

option(VARIABLE "Want to use VARIABLE?" ON)

if(VARIABLE)
   message(STATUS "VARIABLE")
   set(VARIABLE_FLAG "-DVARIABLE")
endif()

set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${VARIABLE_FLAG} -Wall")

I'm using cmake to build the project and qtcreator as IDE. My problem is that qtcreator thinks that VARIABLE is not defined so my code has is not highlighted, but when I build it on a console, VARIABLE is defined. So, what parameters should I pass to qtcreator to run cmake, so that it knows VARIABLE is defined and highlights my code? Is there a way to do this?

Ps: I just use qtcreator to edit files, the build part is done via console commands.

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宫墨修音 2024-12-11 07:40:44

另一种选择是使用配置的头文件，并仅在需要定义的地方包含它：

# in CMakeLists.txt
configure_file(
  ${CMAKE_CURRENT_SOURCE_DIR}/my_defs.h.in
  ${CMAKE_CURRENT_BINARY_DIR}/my_defs.h
  )

include_directories(${CMAKE_CURRENT_BINARY_DIR})

我

// in my_defs.h.in
#cmakedefine VARIABLE
  // configure_file converts #cmakedefine of a named CMake variable
  // into a C++ #define of a C++ pre-processor symbol

最后，

// in various C++ source or header files, but only as needed:
#include "my_defs.h"
#ifdef VARIABLE
  doSome_VARIABLE_SpecificStuff();
#endif

不定期使用 QtCreator，所以我不知道这种技术在语法突出显示方面是否有效，但我我认为会这样，因为他们必须读取头文件才能正确完成它......

Another alternative would be to use a configured header file, and include it only where you need the definition:

# in CMakeLists.txt
configure_file(
  ${CMAKE_CURRENT_SOURCE_DIR}/my_defs.h.in
  ${CMAKE_CURRENT_BINARY_DIR}/my_defs.h
  )

include_directories(${CMAKE_CURRENT_BINARY_DIR})

and

// in my_defs.h.in
#cmakedefine VARIABLE
  // configure_file converts #cmakedefine of a named CMake variable
  // into a C++ #define of a C++ pre-processor symbol

and finally

// in various C++ source or header files, but only as needed:
#include "my_defs.h"
#ifdef VARIABLE
  doSome_VARIABLE_SpecificStuff();
#endif

I do not use QtCreator regularly, so I don't know if this technique works in terms of their syntax highlighting, but I'd assume it would, since they must read header files in order to do a proper job of it...

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