Visual Studio throws "undeclared identifier" from predefined string macro

user_19333949 0
Viewed 49

I have the following preprocessed macro defined under C/C++ -> Command Line -> Additional Options:

/D NV_WORKING_DIRECTORY="C:/foo"

An image from the project settings:

enter image description here

I have the following code:

std::string path = NV_WORKING_DIRECTORY;

When I compile I get this error:

'C': undeclared identifier.

Weirdly, with certain strings the code works. For example if I do /D NV_WORKING_DIRECTORY="foo" everything is good. But "garbage" for some reason gives the same error.

Hardcoding#define NV_WORKING_DIRECTORY "C:/foo/" makes the code above work, but because I need a global macro that is not an option.

Is there something I am doing wrong here? This is a brand new project, and I have not messed around with anything yet.

preprocessor macros visual-studio c++
1 Answers

When you use /D in the C/C++ -> Command Line -> Additional Options, the value is expected to be wrapped in a string.
E.g. the following means the value of XXX will be YYY:

/D XXX="YYY"

Therefore if you need the value of the preprocessor definition to contain the quotes, you need to add and escape them:

/D NV_WORKING_DIRECTORY="\"C:/foo/\""

Alternatively you can add the NV_WORKING_DIRECTORY defintion under C/C++ -> Preprocessor Definitions. There you can simply put the string value that you need:

NV_WORKING_DIRECTORY="C:/foo/"
user_185199210
Related