Add macro '-x**' containing all occurrences of the flag '-x'.

The flags and arguments added to this macro are separated by spaces.

For example, if the macro argument is '-Dxxx', '-D yyy' and
'-D aaa=bbb', the body of the generated macro %{-D**} will
consist of: '-D xxx -D yyy -D aaa=bbb'.

Fix rpm-software-management#546

docs/manual/macros.md

@@ -38,7 +38,8 @@ macros are available:
  %* all arguments (unlike shell, not including any processed flags)
  %# the number of arguments
  %{-f} if present at invocation, the flag f itself
- %{-f*} if present at invocation, the argument to flag f
+ %{-f*} if present at invocation, the argument to the last occurence of flag f
+ %{-f**} if present at invocation, all occurrences of flag f (flag and argument, space separated) (rpm >= 4.18)
  %1, %2 the arguments themselves (after getopt(3) processing)
 ```
 

rpmio/macro.c

@@ -851,6 +851,21 @@ static int mbopt(int c, const char *oarg, int oint, void *data)
  pushMacro(mb->mc, name, NULL, oarg, mb->level, ME_AUTO | ME_LITERAL);
  free(name);
  }
+
+ rasprintf(&name, "-%c**", c);
+ rpmMacroEntry *mep = findEntry(mb->mc, name, 0, NULL);
+ if (mep && oarg)
+ rasprintf(&body, "%s -%c %s", (*mep)->body, c, oarg);
+ else if (mep)
+ rasprintf(&body, "%s -%c", (*mep)->body, c);
+ else if (oarg)
+ rasprintf(&body, "-%c %s", c, oarg);
+ else
+ rasprintf(&body, "-%c", c);
+ pushMacro(mb->mc, name, NULL, body, mb->level, ME_AUTO | ME_LITERAL);
+ free(name);
+ free(body);
+
  return 0;
 }