[Buildroot] [PATCH 1/1] package/openblas: fix build

[Bernd Kuhls <bernd@kuhls.net>]

Buildroot commit b08ac7636dc7b2753592989dc5fe73959e0f6507 bumped the
package to version 0.3.31 and introduced a build error

linktest.c:(.text.startup+0x6f4):
 undefined reference to `openblas_set_threads_callback_function'

which according to https://github.com/OpenMathLib/OpenBLAS/issues/5607
was introduced by upstream commit
https://github.com/OpenMathLib/OpenBLAS/commit/879497990f42e6dcfa370bcbf478cc5674158336
that was first included in version 0.3.31.

This patch adds another upstream commit to fix the problem.

Fixes:
https://autobuild.buildroot.net/results/7d8/7d80a912ddda01acd109786641df02ad826399f6/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
---
 ...allback-replacement-hook-in-singleth.patch | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 package/openblas/0002-Include-thread-callback-replacement-hook-in-singleth.patch

diff --git a/package/openblas/0002-Include-thread-callback-replacement-hook-in-singleth.patch b/package/openblas/0002-Include-thread-callback-replacement-hook-in-singleth.patch
new file mode 100644
index 0000000000..7ea199fb2e
--- /dev/null
+++ b/package/openblas/0002-Include-thread-callback-replacement-hook-in-singleth.patch
@@ -0,0 +1,53 @@
+From 874243421298866d116e1e8bdbd7e0ed4e31e4f6 Mon Sep 17 00:00:00 2001
+From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
+Date: Sun, 18 Jan 2026 19:55:40 +0100
+Subject: [PATCH] Include thread callback replacement hook in singlethreaded
+ builds as well
+
+Upstream: https://github.com/OpenMathLib/OpenBLAS/commit/874243421298866d116e1e8bdbd7e0ed4e31e4f6
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ driver/others/CMakeLists.txt | 2 +-
+ driver/others/Makefile       | 4 ++--
+ 2 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/driver/others/CMakeLists.txt b/driver/others/CMakeLists.txt
+index a07a0baf99..72abdc4ee4 100644
+--- a/driver/others/CMakeLists.txt
++++ b/driver/others/CMakeLists.txt
+@@ -27,7 +27,6 @@ if (USE_THREAD)
+     ${BLAS_SERVER}
+     divtable.c # TODO: Makefile has -UDOUBLE
+     blas_l1_thread.c
+-    blas_server_callback.c
+   )
+ 
+   if (NOT NO_AFFINITY)
+@@ -42,6 +41,7 @@ set(COMMON_SOURCES
+   openblas_env.c
+   openblas_get_num_procs.c
+   openblas_get_num_threads.c
++  blas_server_callback.c
+ )
+ 
+ # these need to have NAME/CNAME set, so use GenerateNamedObjects, but don't use standard name mangling
+diff --git a/driver/others/Makefile b/driver/others/Makefile
+index 719d617c45..fbd016e6b0 100644
+--- a/driver/others/Makefile
++++ b/driver/others/Makefile
+@@ -1,12 +1,12 @@
+ TOPDIR	= ../..
+ include ../../Makefile.system
+ 
+-COMMONOBJS	 = memory.$(SUFFIX) xerbla.$(SUFFIX) c_abs.$(SUFFIX) z_abs.$(SUFFIX) openblas_set_num_threads.$(SUFFIX) openblas_get_num_threads.$(SUFFIX) openblas_get_num_procs.$(SUFFIX) openblas_get_config.$(SUFFIX) openblas_get_parallel.$(SUFFIX) openblas_error_handle.$(SUFFIX) openblas_env.$(SUFFIX)
++COMMONOBJS	 = memory.$(SUFFIX) xerbla.$(SUFFIX) c_abs.$(SUFFIX) z_abs.$(SUFFIX) openblas_set_num_threads.$(SUFFIX) openblas_get_num_threads.$(SUFFIX) openblas_get_num_procs.$(SUFFIX) openblas_get_config.$(SUFFIX) openblas_get_parallel.$(SUFFIX) openblas_error_handle.$(SUFFIX) openblas_env.$(SUFFIX) blas_server_callback.$(SUFFIX)
+ 
+ #COMMONOBJS	+= slamch.$(SUFFIX) slamc3.$(SUFFIX) dlamch.$(SUFFIX)  dlamc3.$(SUFFIX)
+ 
+ ifdef SMP
+-COMMONOBJS	+= blas_server.$(SUFFIX) divtable.$(SUFFIX) blasL1thread.$(SUFFIX) blas_server_callback.$(SUFFIX)
++COMMONOBJS	+= blas_server.$(SUFFIX) divtable.$(SUFFIX) blasL1thread.$(SUFFIX)
+ ifneq ($(NO_AFFINITY), 1)
+ COMMONOBJS	+= init.$(SUFFIX)
+ endif
-- 
2.47.3

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