Handle missing newline at EOF for linkerscript INCLUDEd files (#1691)

src/link/script.y

@@ -251,10 +251,16 @@ yy::parser::symbol_type yylex() {
 	if (c == EOF) {
 		// Basically yywrap().
 		if (lexerStack.size() != 1) {
-			lexerStack.pop_back();
+			if (!atEof) {
-			return yylex();
+				// Inject a newline at EOF to simplify parsing.
+				atEof = true;
+				return yy::parser::make_newline();
+			} else {
+				lexerStack.pop_back();
+				return yylex();
+			}
 		} else if (!atEof) {
-			// Inject a newline at EOF, to avoid errors for files that don't end with one.
+			// Inject a newline at EOF to simplify parsing.
 			atEof = true;
 			return yy::parser::make_newline();
 		} else {

test/link/script-include/a.asm

@@ -0,0 +1,2 @@
+section "a", rom0
+db $11

test/link/script-include/a.inc

@@ -0,0 +1,3 @@
+rom0
+	org 0
+	"a" ; no newline

test/link/script-include/b.asm

@@ -0,0 +1,2 @@
+section "b", rom0
+db $22

test/link/script-include/b.inc

@@ -0,0 +1,3 @@
+rom0
+	org 1
+	"b" ; yes newline

test/link/script-include/ref.out.bin

@@ -0,0 +1 @@
+"

test/link/script-include/script.link

@@ -0,0 +1,2 @@
+include "script-include/a.inc"
+include "script-include/b.inc"

test/link/test.sh

@@ -262,6 +262,16 @@ tryDiff "$test"/out.err "$outtemp"
 tryCmpRomSize "$gbtemp" 65536
 evaluateTest
 
+test="script-include"
+startTest
+"$RGBASM" -o "$otemp" "$test"/a.asm
+"$RGBASM" -o "$gbtemp2" "$test"/b.asm
+continueTest
+rgblinkQuiet -o "$gbtemp" -l "$test"/script.link "$otemp" "$gbtemp2" 2>"$outtemp"
+tryDiff "$test"/out.err "$outtemp"
+tryCmpRom "$test"/ref.out.bin
+evaluateTest
+
 test="sdcc/good"
 startTest
 "$RGBASM" -o "$otemp" "$test"/a.asm