-fsingle-vector-defs to disable _x,_y,_z generation

doc/gmqcc.1

@@ -251,3 +251,8 @@ Produce a linenumber file along with the output .dat file.
 Use C's operator precedence for ternary expressions. Unless your code
 depends on fteqcc-compatible behaviour, you'll want to use thi
 soption.
+.TP
+.B -fsingle-vector-defs
+Normally vectors generate 4 defs, once for the vector, and once for
+its components with _x, _y, _z suffixes. This option
+prevents components from being listed.

ir.c

@@ -3152,7 +3152,7 @@ static void gen_vector_defs(prog_section_def def, const char *name)
     char  *component;
     size_t len, i;
 
-    if (!name)
+    if (!name || OPTS_FLAG(SINGLE_VECTOR_DEFS))
         return;
 
     len = strlen(name);
@@ -3178,7 +3178,7 @@ static void gen_vector_fields(prog_section_field fld, const char *name)
     char  *component;
     size_t len, i;
 
-    if (!name)
+    if (!name || OPTS_FLAG(SINGLE_VECTOR_DEFS))
         return;
 
     len = strlen(name);

opts.def

@@ -39,6 +39,7 @@
     GMQCC_DEFINE_FLAG(ASSIGN_FUNCTION_TYPES)
     GMQCC_DEFINE_FLAG(LNO)
     GMQCC_DEFINE_FLAG(CORRECT_TERNARY)
+    GMQCC_DEFINE_FLAG(SINGLE_VECTOR_DEFS)
 #endif
 
 /* warning flags */