Clang preprocessor concatenates an extra space vs. gcc - standard C99

Question

I maintain a C library project both on gcc and clang.

I am looking for advice on how to make the following macros more portable, terse, readable or standard abiding.

When I compile

#define STRINGIFY(arg) STRINGIFY_(arg)
#define STRINGIFY_(arg) #arg

#define VERSION 1.01
#define PROJECT myProject
#define SUB_PROJECT mySub
#define DASH -

#include STRINGIFY(PROJECT DASH SUB_PROJECT DASH VERSION.c)

I get

clang 6.0.0 standard C99

myProject - mySub - 1.01.c

gcc 7.4.0 standard C99

myProject-mySub-1.01.c

I came up with the following solution

#define STRINGIFY(arg) STRINGIFY_(arg)
#define STRINGIFY_(arg) #arg
#define ID(arg) arg

#define VERSION 1.01
#define PROJECT myProject
#define LIB myLib
#define DASH -
#define DOTC .c

#define FILEVERSION(a, b, c, d, e) STRINGIFY(ID(a)ID(b)ID(c)ID(d)ID(e)ID(DOTC))

#include FILEVERSION(PROJECT, DASH, LIB, DASH, VERSION)