[PATCH gatesgarth 1/2] arm-bsp: fix yylloc kernel build error

[Jon Mason <jdmason@kudzu.us>]

Backport patch from upstream to address the following error:
scripts/dtc/dtc-parser.tab.o:(.bss+0x20): multiple definition of `yylloc'; scripts/dtc/dtc-lexer.lex.o:(.bss+0x0): first defined here

Signed-off-by: Jon Mason <jon.mason@arm.com>
---
 ...ve-redundant-YYLOC-global-declaratio.patch | 54 +++++++++++++++++++
 .../recipes-kernel/linux/linux-yocto_5.3.bb   |  4 +-
 2 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 meta-arm-bsp/recipes-kernel/linux/files/0001-scripts-dtc-Remove-redundant-YYLOC-global-declaratio.patch

diff --git a/meta-arm-bsp/recipes-kernel/linux/files/0001-scripts-dtc-Remove-redundant-YYLOC-global-declaratio.patch b/meta-arm-bsp/recipes-kernel/linux/files/0001-scripts-dtc-Remove-redundant-YYLOC-global-declaratio.patch
new file mode 100644
index 000000000000..efd9803ac792
--- /dev/null
+++ b/meta-arm-bsp/recipes-kernel/linux/files/0001-scripts-dtc-Remove-redundant-YYLOC-global-declaratio.patch
@@ -0,0 +1,54 @@
+Upstream-Status: Backport
+Signed-off-by: Jon Mason <jon.mason@arm.com>
+
+From e33a814e772cdc36436c8c188d8c42d019fda639 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
+
+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>
+---
+ scripts/dtc/dtc-lexer.l | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/scripts/dtc/dtc-lexer.l b/scripts/dtc/dtc-lexer.l
+index 5c6c3fd557d7..b3b7270300de 100644
+--- a/scripts/dtc/dtc-lexer.l
++++ b/scripts/dtc/dtc-lexer.l
+@@ -23,7 +23,6 @@ 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() */
+-- 
+2.30.2
+
diff --git a/meta-arm-bsp/recipes-kernel/linux/linux-yocto_5.3.bb b/meta-arm-bsp/recipes-kernel/linux/linux-yocto_5.3.bb
index 9d5e9ce82acd..d81d3f4e6e46 100644
--- a/meta-arm-bsp/recipes-kernel/linux/linux-yocto_5.3.bb
+++ b/meta-arm-bsp/recipes-kernel/linux/linux-yocto_5.3.bb
@@ -6,7 +6,9 @@ SRCREV_machine = "d4f3318ed8fab6316cb7a269b8f42306632a3876"
 SRCREV_meta = "8d0ed83a864cc91eef4d2abbc90f13d4ecd1c213"
 
 SRC_URI = "git://git.yoctoproject.org/linux-yocto.git;name=machine;branch=${KBRANCH}; \
-           git://git.yoctoproject.org/yocto-kernel-cache;type=kmeta;name=meta;branch=yocto-5.4;destsuffix=${KMETA}"
+           git://git.yoctoproject.org/yocto-kernel-cache;type=kmeta;name=meta;branch=yocto-5.4;destsuffix=${KMETA} \
+           file://0001-scripts-dtc-Remove-redundant-YYLOC-global-declaratio.patch \
+          "
 
 LINUX_VERSION = "5.3.18"
 LIC_FILES_CHKSUM = "file://COPYING;md5=bbea815ee2795b2f4230826c0c6b8814"
-- 
2.30.2