Merge remote-tracking branch 'origin/maint'

* origin/maint: (24 commits)
  tests: calc: modernize the use of locations
  tests: remove useless location initializations
  lalr1.cc: always initialize yylval.
  tests: check that C and C++ objects can be linked together.
  yacc.c: also disable -Wuninitialized.
  glr.cc, yacc.c: initialize yylloc properly
  yacc.c, glr.c: a better YY_LOCATION_PRINT
  yacc.c: simplify initialization
  doc: formatting changes
  c++: fix position operator signatures
  tests: remove useless location initialization.
  tests: fix locations in C
  tests: handle %parse-param in the generated yyerror
  tests: simplifications
  grammars: fix display of nul character in error message
  tests: sort
  tests: cosmetic changes
  comment changes
  autoconf: update
  gnulib: update
  ...

Conflicts:
	data/lalr1.cc
	gnulib
	src/scan-gram.l
	submodules/autoconf
	tests/calc.at

src/scan-gram.l

@@ -354,7 +354,8 @@ eqopt    ([[:space:]]*=)?
   }
 
   . {
-    complain (loc, complaint, _("invalid character: %s"), quote (yytext));
+    complain (loc, complaint, _("invalid character: %s"),
+              quote_mem (yytext, yyleng));
   }
 
   <<EOF>> {
@@ -450,7 +451,7 @@ eqopt    ([[:space:]]*=)?
   }
   . {
     complain (loc, complaint, _("invalid character in bracketed name: %s"),
-                 quote (yytext));
+              quote_mem (yytext, yyleng));
   }
   <<EOF>> {
     BEGIN bracketed_id_context_state;