New header file with version macros

Author: Damian Rouson

src/libcaf-gfortran-descriptor.h

@@ -28,15 +28,9 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  */
 #ifndef LIBCAF_GFORTRAN_DESCRIPTOR_H
 #define LIBCAF_GFORTRAN_DESCRIPTOR_H
 
-#include <stdint.h>	/* For int32_t.  */
-
-#if __GNUC__ >= 8
-#define GCC_GE_8 1
-#endif
+#include "libcaf-version-def.h"
 
-#if __GNUC__ >= 7
-#define GCC_GE_7 1
-#endif
+#include <stdint.h>	/* For int32_t.  */
 
 /* GNU Fortran's array descriptor.  Keep in sync with libgfortran.h.  To be
    replaced by TS29113's ISO_Fortran_binding.h with CFI_cdesc_t.  */

src/libcaf-version-def.h

@@ -0,0 +1,7 @@
+#if __GNUC__ >= 8
+#define GCC_GE_8 1
+#endif
+
+#if __GNUC__ >= 7
+#define GCC_GE_7 1
+#endif

src/libcaf.h

@@ -32,6 +32,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  */
 #include <stddef.h>	/* For size_t.  */
 #include <stdbool.h>
 
+#include  "libcaf-version-def.h"
 #include "libcaf-gfortran-descriptor.h"
 
 #include <mpi.h>
@@ -45,14 +46,6 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  */
 #define unlikely(x)     __builtin_expect(!!(x), 0)
 #endif
 
-#if __GNUC__ >= 8
-#define GCC_GE_8 1
-#endif
-
-#if __GNUC__ >= 7
-#define GCC_GE_7 1
-#endif
-
 #ifdef PREFIX_NAME
 #define PREFIX3(X,Y) X ## Y
 #define PREFIX2(X,Y) PREFIX3(X,Y)