linux-kernel - [PATCH v2] kbuild: support byacc as alternative YACC to bison

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Message-Id: <20191029150119.19823-1-e5ten.arch@gmail.com>
Date:   Tue, 29 Oct 2019 11:01:16 -0400
From:   Ethan Sommer <e5ten.arch@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Ethan Sommer <e5ten.arch@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH v2] kbuild: support byacc as alternative YACC to bison

Switches to a more portable set of flags for generating the same file
names instead of the bison-specific --defines, uses the more portable -V
instead of --version, and explicitly defines YYSTYPE in lex.l, which
bison implicitly defines if not present but byacc does not.

Add %locations to dtc-parser.y to explicitly enable location tracking
for byacc, and define YYERROR_CALL explicitly to prevent the locations
directive from causing it to be defined to a 2-parameter call to
yyerror, which dtc-parser.y defines to accept one parameter.

Requires byacc to be built with --enable-btyacc.

Signed-off-by: Ethan Sommer <e5ten.arch@...il.com>
---
 scripts/Makefile.host     | 2 +-
 scripts/dtc/dtc-parser.y  | 4 ++++
 scripts/genksyms/Makefile | 2 +-
 scripts/genksyms/lex.l    | 2 ++
 4 files changed, 8 insertions(+), 2 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/dtc/dtc-parser.y b/scripts/dtc/dtc-parser.y
index 2ed4dc1f07fd..40dcf4f149da 100644
--- a/scripts/dtc/dtc-parser.y
+++ b/scripts/dtc/dtc-parser.y
@@ -2,6 +2,8 @@
 /*
  * (C) Copyright David Gibson <dwg@....ibm.com>, IBM Corporation.  2005.
  */
+%locations
+
 %{
 #include <stdio.h>
 #include <inttypes.h>
@@ -17,6 +19,8 @@ extern void yyerror(char const *s);
 		treesource_error = true; \
 	} while (0)
 
+#define YYERROR_CALL(msg) yyerror(msg)
+
 extern struct dt_info *parser_output;
 extern bool treesource_error;
 %}
diff --git a/scripts/genksyms/Makefile b/scripts/genksyms/Makefile
index 78629f515e78..397c2dc8182b 100644
--- a/scripts/genksyms/Makefile
+++ b/scripts/genksyms/Makefile
@@ -15,7 +15,7 @@ genksyms-objs	:= genksyms.o parse.tab.o lex.lex.o
 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 
 quiet_cmd_bison_no_warn = $(quiet_cmd_bison)
-      cmd_bison_no_warn = $(YACC) --version >/dev/null; \
+      cmd_bison_no_warn = $(YACC) -V >/dev/null; \
 			  $(cmd_bison) 2>/dev/null
 
 $(obj)/pars%.tab.c $(obj)/pars%.tab.h: $(src)/pars%.y FORCE
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)
-- 
2.23.0