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Asked: 2026-06-15T10:40:55+00:00

I am using the following code in a make file to access a variable

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I am using the following code in a make file to access a variable VENDOR_NAME from a CPP file.

EXTRA_DEFINE += -DVENDOR_NAME=$(VENDOR_NAME)
VENDOR_NAME contains a string.

In my cpp file when I try to use this variable I am getting errors as given below.

cout << VENDOR_NAME;

Feature1.cpp.bak.cpp:8: ‘Default_Vendor’ undeclared (first use this function)
Feature1.cpp.bak.cpp:8: (Each undeclared identifier is reported only once for

I guess this is because my string does not contain double quotes and compiler is considering content of VENDOR_NAME as a variable.

How to get this variable as a string in my CPP file so that I can use it like I have #defineed it?

Thanks…

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1 Answer

  1. Editorial Team

    Your makefile is going to create a command line for the compiler. The problem that arises is that if you just surround the value in quotes:

    EXTRA_DEFINE += -DVENDOR_NAME="$(VENDOR_NAME)"

    …the shell will see the quotes as simply delineating a command line argument, so it’ll probably strip them off (though it can depend on the shell you’re using). To prevent that, you’ll want to create the argument with escaped quotes:

    EXTRA_DEFINE += -DVENDOR_NAME="\"$(VENDOR_NAME)\""

    I think most of the typical shells, at least for Windows and Linux, will accept a back-slash as an escape to preserve the quotes, but I’m sure there’s at least one around for which you’ll have to do the quoting differently.

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