* [Buildroot] [PATCH 1/1] package/glibc: add upstream patch to fix build error with glibc 2.43
@ 2026-05-01 17:14 Bernd Kuhls
2026-05-31 6:20 ` Thomas Petazzoni via buildroot
0 siblings, 1 reply; 2+ messages in thread
From: Bernd Kuhls @ 2026-05-01 17:14 UTC (permalink / raw)
To: buildroot; +Cc: Romain Naour
Seen with this defconfig
BR2_x86_64=y
BR2_GCC_VERSION_15_X=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_PACKAGE_PICOTOOL=y
output/host/x86_64-buildroot-linux-gnu/sysroot/usr/include/bits/struct_mutex.h:35:9:
error: declaration does not declare anything [-fpermissive]
35 | short __unused;
No related autobuilder error was recorded.
The build error does not occur with glibc-2.42 on the 2026.02.x branch.
The build error was reported to picotool upstream:
https://github.com/raspberrypi/picotool/issues/300
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
---
...-__unused-fields-to-__glibc_reserved.patch | 85 +++++++++++++++++++
1 file changed, 85 insertions(+)
create mode 100644 package/glibc/0001-Rename-__unused-fields-to-__glibc_reserved.patch
diff --git a/package/glibc/0001-Rename-__unused-fields-to-__glibc_reserved.patch b/package/glibc/0001-Rename-__unused-fields-to-__glibc_reserved.patch
new file mode 100644
index 0000000000..5b7172df44
--- /dev/null
+++ b/package/glibc/0001-Rename-__unused-fields-to-__glibc_reserved.patch
@@ -0,0 +1,85 @@
+From 243bdfec8f7cd4a85a8ce6e4e9a5a5accd3ce1aa Mon Sep 17 00:00:00 2001
+From: Jakub Jelinek <jakub@redhat.com>
+Date: Tue, 17 Feb 2026 17:06:48 +0100
+Subject: [PATCH] Rename __unused fields to __glibc_reserved.
+
+__unused is often defined to __attribute__((unused)) in BSD
+sources and furthermore libstdc++ testsuite uses it as a macro
+to verify libstdc++ headers don't use __unused identifiers.
+In ~2012 glibc headers have been cleaned up, but some new
+uses of __unused have reappeared (s390 fenv.h already many
+years ago, the rest last November).
+
+Reviewed-by: Florian Weimer <fweimer@redhat.com>
+
+Upstream: https://sourceware.org/git/?p=glibc.git;a=commit;h=243bdfec8f7cd4a85a8ce6e4e9a5a5accd3ce1aa
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ sysdeps/powerpc/nptl/bits/struct_mutex.h | 2 +-
+ sysdeps/s390/fpu/bits/fenv.h | 8 ++++----
+ sysdeps/s390/nptl/bits/struct_mutex.h | 2 +-
+ sysdeps/x86/nptl/bits/struct_mutex.h | 2 +-
+ 4 files changed, 7 insertions(+), 7 deletions(-)
+
+diff --git a/sysdeps/powerpc/nptl/bits/struct_mutex.h b/sysdeps/powerpc/nptl/bits/struct_mutex.h
+index 1472af21f7..ebf2d50922 100644
+--- a/sysdeps/powerpc/nptl/bits/struct_mutex.h
++++ b/sysdeps/powerpc/nptl/bits/struct_mutex.h
+@@ -32,7 +32,7 @@ struct __pthread_mutex_s
+ int __kind;
+ #if __WORDSIZE == 64
+ short __spins;
+- short __unused;
++ short __glibc_reserved;
+ __pthread_list_t __list;
+ # define __PTHREAD_MUTEX_HAVE_PREV 1
+ #else
+diff --git a/sysdeps/s390/fpu/bits/fenv.h b/sysdeps/s390/fpu/bits/fenv.h
+index b9e844e393..33e88fbe9d 100644
+--- a/sysdeps/s390/fpu/bits/fenv.h
++++ b/sysdeps/s390/fpu/bits/fenv.h
+@@ -76,10 +76,10 @@ typedef unsigned int fexcept_t; /* size of fpc */
+ typedef struct
+ {
+ fexcept_t __fpc;
+- void *__unused;
+- /* The field __unused (formerly __ieee_instruction_pointer) is a relict from
+- commit "Remove PTRACE_PEEKUSER" (87b9b50f0d4b92248905e95a06a13c513dc45e59)
+- and isn't used anymore. */
++ void *__glibc_reserved;
++ /* The field __glibc_reserved (formerly __ieee_instruction_pointer) is a
++ relict from commit "Remove PTRACE_PEEKUSER"
++ (87b9b50f0d4b92248905e95a06a13c513dc45e59) and isn't used anymore. */
+ } fenv_t;
+
+ /* If the default argument is used we use this value. */
+diff --git a/sysdeps/s390/nptl/bits/struct_mutex.h b/sysdeps/s390/nptl/bits/struct_mutex.h
+index d069b485d1..571265267c 100644
+--- a/sysdeps/s390/nptl/bits/struct_mutex.h
++++ b/sysdeps/s390/nptl/bits/struct_mutex.h
+@@ -32,7 +32,7 @@ struct __pthread_mutex_s
+ int __kind;
+ #if __WORDSIZE == 64
+ short __spins;
+- short __unused;
++ short __glibc_reserved;
+ __pthread_list_t __list;
+ # define __PTHREAD_MUTEX_HAVE_PREV 1
+ #else
+diff --git a/sysdeps/x86/nptl/bits/struct_mutex.h b/sysdeps/x86/nptl/bits/struct_mutex.h
+index 9c19dff660..13c9894ad4 100644
+--- a/sysdeps/x86/nptl/bits/struct_mutex.h
++++ b/sysdeps/x86/nptl/bits/struct_mutex.h
+@@ -32,7 +32,7 @@ struct __pthread_mutex_s
+ int __kind;
+ #ifdef __x86_64__
+ short __spins;
+- short __unused;
++ short __glibc_reserved;
+ __pthread_list_t __list;
+ # define __PTHREAD_MUTEX_HAVE_PREV 1
+ #else
+--
+2.47.3
+
--
2.47.3
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2026-05-01 17:14 [Buildroot] [PATCH 1/1] package/glibc: add upstream patch to fix build error with glibc 2.43 Bernd Kuhls
2026-05-31 6:20 ` Thomas Petazzoni via buildroot
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