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@@ -0,0 +1,194 @@
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+From 1ccc3f6a2e28fa1f3357826374cba165b3ba3ff7 Mon Sep 17 00:00:00 2001
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+From: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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+Date: Wed, 11 Feb 2026 04:54:28 +0000
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+Subject: [PATCH] GDB: aarch64-linux: Fix build failure on musl systems
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+
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+(cherry picked from commit 02090062127d59978ccc312dabf63c6ea838cd85)
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+
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+When building against musl (e.g. on Alpine Linux), the following error
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+happens:
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+
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+ CXX linux-aarch64-low.o
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+ In file included from /home/bauermann/src/binutils-gdb/gdbserver/linux-aarch64-low.cc:42:
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+ /home/bauermann/src/binutils-gdb/gdbserver/../gdb/arch/aarch64-gcs-linux.h:35:8: error: redefinition of 'struct user_gcs'
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+ 35 | struct user_gcs
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+ | ^~~~~~~~
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+ In file included from /home/bauermann/src/binutils-gdb/gdbserver/linux-aarch64-low.cc:35:
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+ /usr/include/asm/ptrace.h:329:8: note: previous definition of 'struct user_gcs'
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+ 329 | struct user_gcs {
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+ | ^~~~~~~~
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+ make[2]: *** [Makefile:565: linux-aarch64-low.o] Error 1
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+
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+aarch64-linux-tdep.c fails to build in the same way. This happens because
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+aarch64-gcs-linux.h uses GCS_MAGIC to see whether the system headers
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+have GCS-related definitions. The problem is that GCS_MAGIC is defined in
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+<asm/sigcontext.h> while struct gcs_user is defined in <asm/ptrace.h>.
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+It's fine on glibc systems because in the set of system headers that
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+linux-aarch64-low.cc and aarch64-linux-tdep.c include, <asm/sigcontext.h>
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+ends up being included implicitly as well. This doesn't happen when using
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+musl's headers though.
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+
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+There isn't a macro in <asm/ptrace.h> whose presence is correlated with
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+the presence of the struct user_gcs definition, so a configure check is
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+needed to detect it and conditionally define the struct.
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+
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+Also, this change requires aarch64-linux-tdep.c to stop using
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+struct user_gcs because target-dependent code can't include <asm/ptrace.h>
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+and thus even if HAVE_STRUCT_USER_GCS is set, the file won't have the
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+struct definition available. To fix this problem, also backport the
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+definition of AARCH64_LINUX_SIZEOF_GCS_REGSET and use it there.
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+
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+Note that there's another build issue with musl, described in
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+PR gdb/33747 affecting compilation of gdb/ser-unix.c. In order to be
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+able to test this patch, I applied the patch in comment 11 there.
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+
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+Tested with a native build on an Alpine Linux aarch64 system, and also
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+verified that all gdb.arch/aarch64-gcs*.exp tests pass on it.
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+
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+Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33926
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+Co-authored-by: Chris Packham <judge.packham@gmail.com>
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+Approved-By: Andrew Burgess <aburgess@redhat.com>
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+Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
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+---
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+ gdb/aarch64-linux-tdep.c | 5 +++--
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+ gdb/arch/aarch64-gcs-linux.h | 8 +++++---
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+ gdbsupport/config.in | 3 +++
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+ gdbsupport/configure | 36 ++++++++++++++++++++++++++++++++++++
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+ gdbsupport/configure.ac | 19 +++++++++++++++++++
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+ 5 files changed, 66 insertions(+), 5 deletions(-)
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+
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+diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
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+index 76bde85188b..6c402e7ecdd 100644
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+--- a/gdb/aarch64-linux-tdep.c
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++++ b/gdb/aarch64-linux-tdep.c
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+@@ -1684,8 +1684,9 @@ aarch64_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
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+ gcs_regmap, regcache_supply_regset, regcache_collect_regset
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+ };
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+
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+- cb (".reg-aarch-gcs", sizeof (user_gcs), sizeof (user_gcs),
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+- &aarch64_linux_gcs_regset, "GCS registers", cb_data);
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++ cb (".reg-aarch-gcs", AARCH64_LINUX_SIZEOF_GCS_REGSET,
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++ AARCH64_LINUX_SIZEOF_GCS_REGSET, &aarch64_linux_gcs_regset,
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++ "GCS registers", cb_data);
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+ }
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+ }
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+
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+diff --git a/gdb/arch/aarch64-gcs-linux.h b/gdb/arch/aarch64-gcs-linux.h
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+index 018ca37a522..632823a8120 100644
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+--- a/gdb/arch/aarch64-gcs-linux.h
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++++ b/gdb/arch/aarch64-gcs-linux.h
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+@@ -27,8 +27,7 @@
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+ #define HWCAP_GCS (1ULL << 32)
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+ #endif
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+
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+-/* Make sure we only define these if the kernel header doesn't. */
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+-#ifndef GCS_MAGIC
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++#ifndef HAVE_STRUCT_USER_GCS
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+
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+ /* GCS state (NT_ARM_GCS). */
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+
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+@@ -39,6 +38,9 @@ struct user_gcs
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+ uint64_t gcspr_el0;
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+ };
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+
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+-#endif /* GCS_MAGIC */
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++#endif /* HAVE_STRUCT_USER_GCS */
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++
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++/* The GCS regset consists of 3 64-bit registers. */
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++#define AARCH64_LINUX_SIZEOF_GCS_REGSET (3 * 8)
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+
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+ #endif /* GDB_ARCH_AARCH64_GCS_LINUX_H */
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+diff --git a/gdbsupport/config.in b/gdbsupport/config.in
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+index 0beacf22c05..2957ee0f030 100644
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+--- a/gdbsupport/config.in
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++++ b/gdbsupport/config.in
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+@@ -271,6 +271,9 @@
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+ /* Define to 1 if `st_blocks' is a member of `struct stat'. */
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+ #undef HAVE_STRUCT_STAT_ST_BLOCKS
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+
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++/* Define to 1 if your system has struct user_gcs. */
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++#undef HAVE_STRUCT_USER_GCS
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++
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+ /* Define to 1 if you have the <sys/param.h> header file. */
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+ #undef HAVE_SYS_PARAM_H
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+
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+diff --git a/gdbsupport/configure b/gdbsupport/configure
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+index 133ddfa7f6c..66135791aa5 100755
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+--- a/gdbsupport/configure
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++++ b/gdbsupport/configure
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+@@ -14307,6 +14307,42 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
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+
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+
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+
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++# Check for `struct user_gcs`
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++{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for struct user_gcs" >&5
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++$as_echo_n "checking for struct user_gcs... " >&6; }
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++if ${gdb_cv_struct_user_gcs+:} false; then :
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++ $as_echo_n "(cached) " >&6
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++else
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++ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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++/* end confdefs.h. */
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++#include <sys/ptrace.h>
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++ #include <asm/ptrace.h>
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++int
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++main ()
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++{
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++struct user_gcs u;
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++
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++ ;
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++ return 0;
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++}
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++_ACEOF
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++if ac_fn_c_try_compile "$LINENO"; then :
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++ gdb_cv_struct_user_gcs=yes
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++else
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++ gdb_cv_struct_user_gcs=no
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++
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++fi
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++rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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++
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++fi
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++{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gdb_cv_struct_user_gcs" >&5
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++$as_echo "$gdb_cv_struct_user_gcs" >&6; }
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++if test "$gdb_cv_struct_user_gcs" = yes; then
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++
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++$as_echo "#define HAVE_STRUCT_USER_GCS 1" >>confdefs.h
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++
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++fi
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++
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+ # Set the 'development' global.
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+ . $srcdir/../bfd/development.sh
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+
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+diff --git a/gdbsupport/configure.ac b/gdbsupport/configure.ac
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+index b7ccfabd6c6..d3b4c05daeb 100644
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+--- a/gdbsupport/configure.ac
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++++ b/gdbsupport/configure.ac
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+@@ -68,6 +68,25 @@ GDB_AC_PTRACE
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+ AM_GDB_COMPILER_TYPE
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+ AM_GDB_WARNINGS
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+
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++# Check for `struct user_gcs`
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++AC_CACHE_CHECK(
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++ [for struct user_gcs],
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++ [gdb_cv_struct_user_gcs],
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++ [AC_COMPILE_IFELSE(
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++ [AC_LANG_PROGRAM(
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++ [#include <sys/ptrace.h>
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++ #include <asm/ptrace.h>],
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++ [struct user_gcs u;]
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++ )],
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++ [gdb_cv_struct_user_gcs=yes],
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++ [gdb_cv_struct_user_gcs=no]
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++ )]
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++)
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++if test "$gdb_cv_struct_user_gcs" = yes; then
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++ AC_DEFINE(HAVE_STRUCT_USER_GCS, 1,
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++ [Define to 1 if your system has struct user_gcs.])
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++fi
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++
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+ # Set the 'development' global.
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+ . $srcdir/../bfd/development.sh
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+
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+--
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+2.47.3
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+
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Waldemar Brodkorb