Is there a way to have the C Preprocessor resolve macros in an #error statement?

Question

Just as the title says. I want to use a preprocessor macro in the text of an #error statement:

#define SOME_MACRO 1

#if SOME_MACRO != 0
    #error \"SOME_MACRO          


        

Answer 1

For completeness the C++0x way I suggested (using the same trick as Kirill):

#define STRING2(x) #x
#define STRING(x) STRING2(x)

#define EXPECT(v,a) static_assert((v)==(a), "Expecting " #v "==" STRING(a) " [" #v ": "  STRING(v) "]")


#define VALUE 1

EXPECT(VALUE, 0);

Gives:

g++ -Wall -Wextra -std=c++0x test.cc                     
test.cc:9: error: static assertion failed: "Expecting VALUE==0 [VALUE: 1]"