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Install parameter macros in the symbol table

Due to the new implementation of the symbol table
it is always needed a call to install().

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -247,6 +247,7 @@

 getpars(Symbol *args[NR_MACROARG])

 {

 	int n = -1;

+	Symbol *sym;

 	if (!accept('('))

 		return n;

@@ -263,7 +264,9 @@

 			cpperror("macro arguments must be identifiers");

 			return NR_MACROARG;

 		}

-		args[n++] = yylval.sym;

+		sym = install(NS_IDEN, yylval.sym);

+		sym->flags |= ISUSED;

+		args[n++] = sym;

 		next();

 	} while (accept(','));

 	expect(')');

--- a/cc1/tests/test026.c

+++ b/cc1/tests/test026.c

@@ -3,18 +3,18 @@

 name: TEST026

 descritpion: Test of predefined cpp macros

 output:

-F1

-G2	F1	main

+F2

+G3	F2	main

 {

 \

-A3	I	y

-A5	P	p

-	A5	"746573743032362E63	'P	:P

-	A3	#I1E	:I

-	A3	#I1	:I

-	A3	#I1	:I

-	A3	#I1	:I

-	A3	A3	:I

+A4	I	y

+A6	P	p

+	A6	"746573743032362E63	'P	:P

+	A4	#I1E	:I

+	A4	#I1	:I

+	A4	#I1	:I

+	A4	#I1	:I

+	A4	#I1	:I

 }

 */