Failing to resolve GVAR macro

[kymckay]

#define ADDON TEST
#define DOUBLES(var1, var2) var1##_##var2
#define GVAR(var1) DOUBLES(ADDON, var1)

GVAR(var)

This should resolve to TEST_var and is currently resolving to TEST_ var which is then considered as 2 tokens and causes a syntax error. Presumably a bug in the way I handle preprocessing concatenation.

[kymckay]

The incompatible behaviour occurring is that the space character in the macro argument is preserved instead of ignored. I need to check whether spaces should always be trimmed from arguments, or if it only applies to concatenation.