linux-kernel - [PATCH] make yacc usage POSIX-compliant

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Message-Id: <20200130162314.31449-1-e5ten.arch@gmail.com>
Date:   Thu, 30 Jan 2020 11:23:11 -0500
From:   Ethan Sommer <e5ten.arch@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Ethan Sommer <e5ten.arch@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] make yacc usage POSIX-compliant

use -b and -d to generate correctly named source and header files,
instead of bison-specific --defines and non-POSIX -o
check that YACC command is found in path or is an executable file,
instead of using bison-specific --version flag to display an error when
it is missing
explicitly define yyltype in scripts/genksyms/lex.l, instead of relying
on bison automatically defining it
replace bison-specific %destructor use in scripts/kconfig/parser.y
dtc's yacc usage is not covered here, as its use of bison-specific
features is much greater, and it is only built on certain architectures,
unlike kconfig and genksyms

Signed-off-by: Ethan Sommer <e5ten.arch@...il.com>
---
 scripts/Makefile.host     |  2 +-
 scripts/genksyms/Makefile |  6 ++++--
 scripts/genksyms/lex.l    |  2 ++
 scripts/kconfig/parser.y  | 14 +++++++-------
 4 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index 4c51c95d40f4..64e98e1d4825 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -11,7 +11,7 @@ $(obj)/%.lex.c: $(src)/%.l FORCE
 # YACC
 # ---------------------------------------------------------------------------
 quiet_cmd_bison = YACC    $(basename $@).[ch]
-      cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $<
+      cmd_bison = $(YACC) -b $(basename $(basename $@)) -d -t -l $<
 
 $(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
 	$(call if_changed,bison)
diff --git a/scripts/genksyms/Makefile b/scripts/genksyms/Makefile
index 78629f515e78..1e120328fa88 100644
--- a/scripts/genksyms/Makefile
+++ b/scripts/genksyms/Makefile
@@ -14,9 +14,11 @@ genksyms-objs	:= genksyms.o parse.tab.o lex.lex.o
 # so that 'bison: not found' will be displayed if it is missing.
 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 
+ifeq ($(shell command -v $(YACC) || [ -x $(YACC) ] && echo y),)
+  $(error command not found: $(YACC))
+endif
 quiet_cmd_bison_no_warn = $(quiet_cmd_bison)
-      cmd_bison_no_warn = $(YACC) --version >/dev/null; \
-			  $(cmd_bison) 2>/dev/null
+      cmd_bison_no_warn = $(cmd_bison) 2>/dev/null
 
 $(obj)/pars%.tab.c $(obj)/pars%.tab.h: $(src)/pars%.y FORCE
 	$(call if_changed,bison_no_warn)
diff --git a/scripts/genksyms/lex.l b/scripts/genksyms/lex.l
index e265c5d96861..0580c088527f 100644
--- a/scripts/genksyms/lex.l
+++ b/scripts/genksyms/lex.l
@@ -19,6 +19,8 @@
 #include "genksyms.h"
 #include "parse.tab.h"
 
+extern YYSTYPE yylval;
+
 /* We've got a two-level lexer here.  We let flex do basic tokenization
    and then we categorize those basic tokens in the second stage.  */
 #define YY_DECL		static int yylex1(void)
diff --git a/scripts/kconfig/parser.y b/scripts/kconfig/parser.y
index b3eff9613cf8..9eb9a94a68e0 100644
--- a/scripts/kconfig/parser.y
+++ b/scripts/kconfig/parser.y
@@ -20,6 +20,8 @@
 
 int cdebug = PRINTD;
 
+int yynerrs = 0;
+
 static void yyerror(const char *err);
 static void zconfprint(const char *err, ...);
 static void zconf_error(const char *err, ...);
@@ -101,13 +103,6 @@ static struct menu *current_menu, *current_entry;
 %type <string> word_opt assign_val
 %type <flavor> assign_op
 
-%destructor {
-	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
-		$$->file->name, $$->lineno);
-	if (current_menu == $$)
-		menu_end_menu();
-} if_entry menu_entry choice_entry
-
 %%
 input: mainmenu_stmt stmt_list | stmt_list;
 
@@ -529,6 +524,11 @@ static bool zconf_endtoken(const char *tokenname,
 	if (strcmp(tokenname, expected_tokenname)) {
 		zconf_error("unexpected '%s' within %s block",
 			    tokenname, expected_tokenname);
+		if (!strcmp(tokenname, "if") || !strcmp(tokenname, "menu") ||
+			!strcmp(tokenname, "choice"))
+			fprintf(stderr, "%s:%d: missing end statement for this entry\n",
+				current_menu->file->name, current_menu->lineno);
+		menu_end_menu();
 		yynerrs++;
 		return false;
 	}
-- 
2.25.0