Ubuntu 22.04 编译报错 multiple definition of 'yylloc';

WhycanService LV 8

打入以下补丁解决

From 11647f99b4de6bc460e106e876f72fc7af3e54a6 Mon Sep 17 00:00:00 2001
From: Dirk Mueller <dmueller@suse.com>
Date: Tue, 14 Jan 2020 18:53:41 +0100
Subject: [PATCH] scripts/dtc: Remove redundant YYLOC global declaration

commit e33a814e772cdc36436c8c188d8c42d019fda639 upstream.

gcc 10 will default to -fno-common, which causes this error at link
time:

  (.text+0x0): multiple definition of `yylloc'; dtc-lexer.lex.o (symbol from plugin):(.text+0x0): first defined here

This is because both dtc-lexer as well as dtc-parser define the same
global symbol yyloc. Before with -fcommon those were merged into one
defintion. The proper solution would be to to mark this as "extern",
however that leads to:

  dtc-lexer.l:26:16: error: redundant redeclaration of 'yylloc' [-Werror=redundant-decls]
   26 | extern YYLTYPE yylloc;
      |                ^~~~~~
In file included from dtc-lexer.l:24:
dtc-parser.tab.h:127:16: note: previous declaration of 'yylloc' was here
  127 | extern YYLTYPE yylloc;
      |                ^~~~~~
cc1: all warnings being treated as errors

which means the declaration is completely redundant and can just be
dropped.

Signed-off-by: Dirk Mueller <dmueller@suse.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[robh: cherry-pick from upstream]
Cc: stable@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
[nc: Also apply to dtc-lexer.lex.c_shipped due to a lack of
     e039139be8c2, where dtc-lexer.l started being used]
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: I7f299451e99aab09375883546e47505ec0937c26
---
 scripts/dtc/dtc-lexer.l             | 1 -
 scripts/dtc/dtc-lexer.lex.c_shipped | 1 -
 2 files changed, 2 deletions(-)

diff --git a/scripts/dtc/dtc-lexer.l b/scripts/dtc/dtc-lexer.l
index c600603044f3..cf7707be43aa 100644
--- a/scripts/dtc/dtc-lexer.l
+++ b/scripts/dtc/dtc-lexer.l
@@ -38,7 +38,6 @@ LINECOMMENT	"//".*\n
 #include "srcpos.h"
 #include "dtc-parser.tab.h"
 
-YYLTYPE yylloc;
 extern bool treesource_error;
 
 /* CAUTION: this will stop working if we ever use yyless() or yyunput() */
diff --git a/scripts/dtc/dtc-lexer.lex.c_shipped b/scripts/dtc/dtc-lexer.lex.c_shipped
index 2c862bc86ad0..e3663ce1af5d 100644
--- a/scripts/dtc/dtc-lexer.lex.c_shipped
+++ b/scripts/dtc/dtc-lexer.lex.c_shipped
@@ -631,7 +631,6 @@ char *yytext;
 #include "srcpos.h"
 #include "dtc-parser.tab.h"
 
-YYLTYPE yylloc;
 extern bool treesource_error;
 
 /* CAUTION: this will stop working if we ever use yyless() or yyunput() */

fafa1123 LV 2

/root/tina-v853-open/kernel/linux-4.9/scripts/dtc
找到文件 dtc-lexer.lex.c_shipped
搜索YYLTYPE yylloc
修订为 extern YYLTYPE yylloc

问题就解决了