nbench-byte: Fix sysinfo generation in parallel build

The project Makefile uses a script (sysinfo.sh) to non-atomically generate
two .c files (sysinfo.c, sysinfoc.c) which are then included in the build.
Since the script always overwrites both .c files, the Makefile should only
invoke it once, not twice in parallel. Otherwise the .c files may be
corrupted and cause random build failures in parallel builds.

Requires at least GNU make 4.3, for Grouped Targets support [1].

[1] https://lists.gnu.org/archive/html/info-gnu/2020-01/msg00004.html

Reviewed-by: Silvio Fricke <silvio.fricke@gin.de>
Signed-off-by: Daniel Klauer <daniel.klauer@gin.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

3 files changed, 99 insertions, 1 deletions

diff --git a/meta-oe/recipes-benchmark/nbench-byte/nbench-byte/Makefile-Fix-sysinfo-generation-in-parallel-build.patch b/meta-oe/recipes-benchmark/nbench-byte/nbench-byte/Makefile-Fix-sysinfo-generation-in-parallel-build.patch
new file mode 100644
index 0000000000..b5f60b1c87
--- /dev/null
+++ b/meta-oe/recipes-benchmark/nbench-byte/nbench-byte/Makefile-Fix-sysinfo-generation-in-parallel-build.patch
@@ -0,0 +1,69 @@
+From 26e13ce45ffeb2f233d1dd7e4321cb65ab10b0fb Mon Sep 17 00:00:00 2001
+From: Daniel Klauer <daniel.klauer@gin.de>
+Date: Fri, 6 Feb 2026 17:13:49 +0100
+Subject: [PATCH] Makefile: Fix sysinfo generation in parallel build
+
+sysinfo.sh non-atomically overwrites both sysinfo.c and sysinfoc.c,
+so it should only be invoked once, not twice in parallel.
+
+Requires at least GNU make 4.3, for Grouped Targets support [1].
+
+Should fix random build failures like this one:
+
+| NOTE: make -j 20 -e MAKEFLAGS=
+[...]
+| ./sysinfo.sh x86_64-gin-linux-gcc [...]
+| ./sysinfo.sh x86_64-gin-linux-gcc [...]
+[...]
+| x86_64-gin-linux-gcc [...] \
+|       -c nbench0.c
+| In file included from nbench0.c:219:
+| sysinfo.c: In function 'main':
+| sysinfo.c:11:1: error: 'fer' undeclared (first use in this function)
+|    11 | fer);
+|       | ^~~
+| sysinfo.c:11:1: note: each undeclared identifier is reported only once for each function it appears in
+| sysinfo.c:11:4: error: expected ';' before ')' token
+|    11 | fer);
+|       |    ^
+|       |    ;
+| sysinfo.c:11:4: error: expected statement before ')' token
+| In file included from nbench0.c:317:
+| sysinfoc.c:5:4: error: expected ';' before ')' token
+|     5 | fer);
+|       |    ^
+|       |    ;
+| sysinfoc.c:5:4: error: expected statement before ')' token
+| make: *** [Makefile:115: nbench0.o] Error 1
+| make: *** Waiting for unfinished jobs....
+| ERROR: oe_runmake failed
+| WARNING: exit code 1 from a shell command.
+NOTE: recipe nbench-byte-2.2.3-r0: task do_compile: Failed
+
+[1] https://lists.gnu.org/archive/html/info-gnu/2020-01/msg00004.html
+Upstream-Status: Inactive-Upstream [lastrelease 2003, no vcs]
+Signed-off-by: Daniel Klauer <daniel.klauer@gin.de>
+---
+ Makefile | 6 ++----
+ 1 file changed, 2 insertions(+), 4 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index edd9ea2..66b2ddc 100644
+--- a/Makefile
++++ b/Makefile
+@@ -95,10 +95,8 @@ DEFINES= -DLINUX $(NO_UNAME)
+ 
+ ##########################################################################
+ # For LINUX-like systems with gcc
+-sysinfoc.c: Makefile
+-       ./sysinfo.sh $(CC) $(MACHINE) $(DEFINES) $(CFLAGS)
+-
+-sysinfo.c: Makefile
++# sysinfo.sh generates both sysinfo.c and sysinfoc.c
++sysinfo.c sysinfoc.c &: Makefile
+        ./sysinfo.sh $(CC) $(MACHINE) $(DEFINES) $(CFLAGS)
+ 
+ ##########################################################################
+-- 
+2.43.0
+
diff --git a/meta-oe/recipes-benchmark/nbench-byte/nbench-byte/sysinfo.sh-Fix-typo-in-rm-command.patch b/meta-oe/recipes-benchmark/nbench-byte/nbench-byte/sysinfo.sh-Fix-typo-in-rm-command.patch
new file mode 100644
index 0000000000..c6a37c3e56
--- /dev/null
+++ b/meta-oe/recipes-benchmark/nbench-byte/nbench-byte/sysinfo.sh-Fix-typo-in-rm-command.patch
@@ -0,0 +1,27 @@
+From 0019af6eb5188f5111a0f2008c0002b545382b67 Mon Sep 17 00:00:00 2001
+From: Daniel Klauer <daniel.klauer@gin.de>
+Date: Fri, 6 Feb 2026 17:14:53 +0100
+Subject: [PATCH] sysinfo.sh: Fix typo in rm command
+
+Upstream-Status: Inactive-Upstream [lastrelease 2003, no vcs]
+Signed-off-by: Daniel Klauer <daniel.klauer@gin.de>
+---
+ sysinfo.sh | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/sysinfo.sh b/sysinfo.sh
+index 57754fe..1373699 100755
+--- a/sysinfo.sh
++++ b/sysinfo.sh
+@@ -61,7 +61,7 @@ if ($* hello.c -o hello) >/dev/null 2>&1; then
+   fi
+ fi
+ 
+-rm -f sysinfo.crm sysinfoc.c hello
++rm -f sysinfo.c sysinfoc.c hello
+ 
+ # this bombs out on Ultrix which expect "cut -d"
+ 
+-- 
+2.43.0
+
diff --git a/meta-oe/recipes-benchmark/nbench-byte/nbench-byte_2.2.3.bb b/meta-oe/recipes-benchmark/nbench-byte/nbench-byte_2.2.3.bb
index da03ebb291..538ff24c0a 100644
--- a/meta-oe/recipes-benchmark/nbench-byte/nbench-byte_2.2.3.bb
+++ b/meta-oe/recipes-benchmark/nbench-byte/nbench-byte_2.2.3.bb
@@ -10,7 +10,9 @@ SECTION = "console/utils"
 SRC_URI = "https://fossies.org/linux/misc/old/${BP}.tar.gz \
            file://nbench_32bits.patch \
            file://Makefile-add-more-dependencies-to-pointer.h.patch \
-           file://0001-Fix-build-error-with-gcc-15.patch"
+           file://0001-Fix-build-error-with-gcc-15.patch \
+           file://Makefile-Fix-sysinfo-generation-in-parallel-build.patch \
+           file://sysinfo.sh-Fix-typo-in-rm-command.patch"
 
 SRC_URI[sha256sum] = "723dd073f80e9969639eb577d2af4b540fc29716b6eafdac488d8f5aed9101ac"