CODEWITHSUNDEEP
c++qtmacrosqmake
Arty McLabin
Arty McLabin

Reputation: 83

How to add a string-valued macro via qmake DEFINES?

I'm trying to add a macro similar to #define CPP_COMPILER_SETTING "g++ -std=c++1z"

in the .pro file:

DEFINES += "CPP_COMPILER_SETTING=\\\"g++ \\-std\\=c++1z\\\""

In the generated Makefile I get:

DEFINES = -DCPP_COMPILER_SETTING=\"g++ \-std\=c++1z\"

I'm getting this error upon compilation:

g++: error: \-std\=c++1z": No such file or directory

How should I escape the string so that it makes it from the .pro file to the compiler's input?

Upvotes: 3

Views: 1563

Answers (1)

Kuba hasn't forgotten Monica
Kuba hasn't forgotten Monica

Reputation: 98425

You need to have the following in the Makefile:

-DCPP_COMPILER_SETTING=\"g++\ -std=c++1z\"
                       ^^   ^           ^^

To take it to a .pro file, you need to escape backlashes and double quotes only. Thus, in the .pro file, you'll have:

DEFINES += "CPP_COMPILER_SETTING=\\\"g++\\ -std=c++1z\\\""

Test case:

#include <iostream>
int main()
{
    std::cout << CPP_COMPILER_SETTING << std::endl;
}

When you google qmake escaping defines with spaces, the first result is the correct solution.

Upvotes: 4

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