From 404d7421d2344b3988b74a92675854bcb963a0b5185fd0a75beca52aa4b6a7e4 Mon Sep 17 00:00:00 2001
From: Dirk Mueller <dmueller@suse.com>
Date: Tue, 27 Sep 2022 11:25:54 +0000
Subject: [PATCH] Accepting request 1006015 from home:Andreas_Schwab:Factory

- makefile-bison-rule.patch: Makefile: fix infinite recursion by dropping
  non-existent `%.output`

OBS-URL: https://build.opensuse.org/request/show/1006015
OBS-URL: https://build.opensuse.org/package/show/Base:System/dtc?expand=0&rev=59
---
 dtc.changes               |  6 +++++
 dtc.spec                  |  2 ++
 makefile-bison-rule.patch | 50 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+)
 create mode 100644 makefile-bison-rule.patch

diff --git a/dtc.changes b/dtc.changes
index 8bce562..747d7e6 100644
--- a/dtc.changes
+++ b/dtc.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Sep 26 07:37:52 UTC 2022 - Andreas Schwab <schwab@suse.de>
+
+- makefile-bison-rule.patch: Makefile: fix infinite recursion by dropping
+  non-existent `%.output`
+
 -------------------------------------------------------------------
 Sat Oct 16 13:06:58 UTC 2021 - Dirk Müller <dmueller@suse.com>
 
diff --git a/dtc.spec b/dtc.spec
index 141e3f9..35b1a9d 100644
--- a/dtc.spec
+++ b/dtc.spec
@@ -27,6 +27,7 @@ Source0:        https://mirrors.edge.kernel.org/pub/software/utils/dtc/dtc-%{ver
 Source1:        https://mirrors.edge.kernel.org/pub/software/utils/dtc/dtc-%{version}.tar.sign
 Source20:       baselibs.conf
 Source21:       dtc.keyring
+Patch0:         makefile-bison-rule.patch
 BuildRequires:  bison
 BuildRequires:  flex
 BuildRequires:  libyaml-devel
@@ -59,6 +60,7 @@ This package provides development files for libfdt
 
 %prep
 %setup -q
+%patch0 -p1
 
 %build
 %make_build EXTRA_CFLAGS="%{optflags} -pie" LDFLAGS="%{optflags}"
diff --git a/makefile-bison-rule.patch b/makefile-bison-rule.patch
new file mode 100644
index 0000000..138eb32
--- /dev/null
+++ b/makefile-bison-rule.patch
@@ -0,0 +1,50 @@
+From 98a07006c48dc0bc3f42b3b3ce75b7f03e87e724 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <slyich@gmail.com>
+Date: Sun, 25 Sep 2022 11:42:03 +0100
+Subject: [PATCH] Makefile: fix infinite recursion by dropping non-existent
+ `%.output`
+
+Without the change GNU `make-4.4` falls into infinite recursion of trying
+to generate %.output files (bison is not passed flags to generate debug
+output).
+
+This happens on GNU `make-4.4` only after GNU make change to more eagerly
+rebuild all target outputs in multiple targets:
+    https://savannah.gnu.org/bugs/index.php?63098
+
+The recursion here is the following:
+
+- Makefile depends on *.d files
+- *.d files depend on *.c files
+- *.c files are generated by bison
+- bison is triggered whenever some of it's multiple targets are missing
+
+In our case `%.output` is always missing and bison is always reran.
+*.d files are always regenerated on `make` run. And make is always
+restarted as *.d files are always regenerated.
+
+The fix removes infeasible `%.output`.
+
+Signed-off-by: Sergei Trofimovich <slyich@gmail.com>
+Message-Id: <20220925104203.648449-2-slyich@gmail.com>
+Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
+---
+ Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/Makefile b/Makefile
+index e7a0dcb..d4e7551 100644
+--- a/Makefile
++++ b/Makefile
+@@ -384,7 +384,7 @@ clean: libfdt_clean pylibfdt_clean tests_clean
+ 	@$(VECHO) LEX $@
+ 	$(LEX) -o$@ $<
+ 
+-%.tab.c %.tab.h %.output: %.y
++%.tab.c %.tab.h: %.y
+ 	@$(VECHO) BISON $@
+ 	$(BISON) -b $(basename $(basename $@)) -d $<
+ 
+-- 
+2.37.3
+