[PATCH] gdb, amdgpu: add config guards for AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE

[Tankut Baris Aktemur <tankutbaris.aktemur@amd.com>]

Commit e52a8aca2baf6481c4e8fea45530283759096be5 "gdb, amdgpu: handle
UNAVAILABLE error when accessing memory" used an enum value from
amd-dbgapi named AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE that may
not be available in all installed packages.  This causes a build
failure as reported by Tom Tromey at

  https://sourceware.org/pipermail/gdb-patches/2026-October/231115.html

Detect at configuration time if the enum value exists and guard the
newly added code accordingly.
---
 gdb/amd-dbgapi-target.c |  4 ++++
 gdb/config.in           |  3 +++
 gdb/configure           | 36 ++++++++++++++++++++++++++++++++++++
 gdb/configure.ac        | 21 +++++++++++++++++++++
 4 files changed, 64 insertions(+)

diff --git a/gdb/amd-dbgapi-target.c b/gdb/amd-dbgapi-target.c
index 2fd175de6f7..1446187c75f 100644
--- a/gdb/amd-dbgapi-target.c
+++ b/gdb/amd-dbgapi-target.c
@@ -786,11 +786,13 @@ amd_dbgapi_target::xfer_partial (enum target_object object, const char *annex,
 				      AMD_DBGAPI_ADDRESS_SPACE_GLOBAL,
 				      offset, &len, writebuf);
 
+#if AMD_DBGAPI_HAS_STATUS_ERROR_MEMORY_UNAVAILABLE
   if (status == AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE)
     {
       *xfered_len = requested_len;
       return TARGET_XFER_UNAVAILABLE;
     }
+#endif
 
   if (status != AMD_DBGAPI_STATUS_SUCCESS)
     return TARGET_XFER_E_IO;
@@ -2576,8 +2578,10 @@ amd_dbgapi_xfer_global_memory_callback
 
   if (status == TARGET_XFER_EOF)
     return AMD_DBGAPI_STATUS_ERROR_PROCESS_EXITED;
+#if AMD_DBGAPI_HAS_STATUS_ERROR_MEMORY_UNAVAILABLE
   else if (status == TARGET_XFER_UNAVAILABLE)
     return AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE;
+#endif
   else if (status != TARGET_XFER_OK)
     return AMD_DBGAPI_STATUS_ERROR_MEMORY_ACCESS;
 
diff --git a/gdb/config.in b/gdb/config.in
index 7ea0e9cfce8..93060f573c5 100644
--- a/gdb/config.in
+++ b/gdb/config.in
@@ -6,6 +6,9 @@
 /* Additional directories to look for separate debug info. */
 #undef ADDITIONAL_DEBUG_DIRS
 
+/* Define if AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE is available. */
+#undef AMD_DBGAPI_HAS_STATUS_ERROR_MEMORY_UNAVAILABLE
+
 /* Directories from which to load auto-loaded scripts. */
 #undef AUTO_LOAD_DIR
 
diff --git a/gdb/configure b/gdb/configure
index 0ed49887480..eaa8588fe69 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -25105,6 +25105,42 @@ $as_echo "#define HAVE_AMD_DBGAPI 1" >>confdefs.h
 	as_fn_error $? "amd-dbgapi not supported for host ${gdb_host}" "$LINENO" 5
 	;;
     esac
+
+    # Detect if AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE can be used.
+    save_CPPFLAGS="$CPPFLAGS"
+    CPPFLAGS="$CPPFLAGS $AMD_DBGAPI_CFLAGS"
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE is available" >&5
+$as_echo_n "checking whether AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE is available... " >&6; }
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <amd-dbgapi/amd-dbgapi.h>
+int
+main ()
+{
+amd_dbgapi_status_t s = AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE;
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  amd_dbgapi_has_status_error_memory_unavailable=yes
+       { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+  amd_dbgapi_has_status_error_memory_unavailable=no
+       { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+    CPPFLAGS="$save_CPPFLAGS"
+
+    if test "x${amd_dbgapi_has_status_error_memory_unavailable}" = "xyes"; then
+
+$as_echo "#define AMD_DBGAPI_HAS_STATUS_ERROR_MEMORY_UNAVAILABLE 1" >>confdefs.h
+
+    fi
+
   elif test "$gdb_require_amd_dbgapi" = true -o "$with_amd_dbgapi" = yes; then
     # amd-dbgapi was not found and...
     #
diff --git a/gdb/configure.ac b/gdb/configure.ac
index e0117ede292..274d248a64d 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -368,6 +368,27 @@ if test "$gdb_require_amd_dbgapi" = true \
 	AC_MSG_ERROR([amd-dbgapi not supported for host ${gdb_host}])
 	;;
     esac
+
+    # Detect if AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE can be used.
+    save_CPPFLAGS="$CPPFLAGS"
+    CPPFLAGS="$CPPFLAGS $AMD_DBGAPI_CFLAGS"
+    AC_MSG_CHECKING([whether AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE is available])
+    AC_COMPILE_IFELSE(
+      [AC_LANG_PROGRAM(
+       [[#include <amd-dbgapi/amd-dbgapi.h>]],
+       [[amd_dbgapi_status_t s = AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE;]]
+       )],
+       [amd_dbgapi_has_status_error_memory_unavailable=yes
+       AC_MSG_RESULT([yes])],
+       [amd_dbgapi_has_status_error_memory_unavailable=no
+       AC_MSG_RESULT([no])])
+    CPPFLAGS="$save_CPPFLAGS"
+
+    if test "x${amd_dbgapi_has_status_error_memory_unavailable}" = "xyes"; then
+      AC_DEFINE(AMD_DBGAPI_HAS_STATUS_ERROR_MEMORY_UNAVAILABLE, 1,
+		[Define if AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE is available.])
+    fi
+
   elif test "$gdb_require_amd_dbgapi" = true -o "$with_amd_dbgapi" = yes; then
     # amd-dbgapi was not found and...
     #
-- 
2.53.0