[PATCH v3] 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           |  4 ++++
 gdb/configure           | 21 +++++++++++++++++++++
 gdb/configure.ac        | 10 ++++++++++
 4 files changed, 39 insertions(+)

diff --git a/gdb/amd-dbgapi-target.c b/gdb/amd-dbgapi-target.c
index 2fd175de6f7..a38a8bafb90 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 HAVE_DECL_AMD_DBGAPI_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 HAVE_DECL_AMD_DBGAPI_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..ce48cfd9e22 100644
--- a/gdb/config.in
+++ b/gdb/config.in
@@ -136,6 +136,10 @@
    you don't. */
 #undef HAVE_DECL_ADDR_NO_RANDOMIZE
 
+/* Define to 1 if you have the declaration of
+   `AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE', and to 0 if you don't. */
+#undef HAVE_DECL_AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE
+
 /* Define to 1 if you have the declaration of `asprintf', and to 0 if you
    don't. */
 #undef HAVE_DECL_ASPRINTF
diff --git a/gdb/configure b/gdb/configure
index 0ed49887480..0e3efec3f81 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -25105,6 +25105,27 @@ $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.
+    # This value is available with amd-dbgapi version 0.78.0.
+    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
+$as_echo_n "checking whether AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE is available... " >&6; }
+    ac_fn_c_check_decl "$LINENO" "AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE" "ac_cv_have_decl_AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE" "#include <amd-dbgapi/amd-dbgapi.h>
+"
+if test "x$ac_cv_have_decl_AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE $ac_have_decl
+_ACEOF
+
+    CPPFLAGS="$save_CPPFLAGS"
+
   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..ee10f555b3c 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -368,6 +368,16 @@ if test "$gdb_require_amd_dbgapi" = true \
 	AC_MSG_ERROR([amd-dbgapi not supported for host ${gdb_host}])
 	;;
     esac
+
+    # Detect if AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE can be used.
+    # This value is available with amd-dbgapi version 0.78.0.
+    save_CPPFLAGS="$CPPFLAGS"
+    CPPFLAGS="$CPPFLAGS $AMD_DBGAPI_CFLAGS"
+    AC_MSG_CHECKING([whether AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE is available])
+    AC_CHECK_DECLS(AMD_DBGAPI_STATUS_ERROR_MEMORY_UNAVAILABLE,
+		   [], [], [[#include <amd-dbgapi/amd-dbgapi.h>]])
+    CPPFLAGS="$save_CPPFLAGS"
+
   elif test "$gdb_require_amd_dbgapi" = true -o "$with_amd_dbgapi" = yes; then
     # amd-dbgapi was not found and...
     #
-- 
2.43.0