[PATCH 2/2] Introduce gnat-llvm board file

[Tom Tromey]

This adds a new gnat-llvm board file, so that gdb's Ada tests can be
run against gnat-llvm.  It changes foreach_gnat_encoding to handle the
gnat-llvm case, and finally it updates a few tests to adapt as well.
---
 gdb/testsuite/boards/gnat-llvm.exp       | 29 +++++++++++++++++++++++++++++
 gdb/testsuite/gdb.ada/bias.exp           |  8 ++++++--
 gdb/testsuite/gdb.ada/finish-large.exp   |  2 +-
 gdb/testsuite/gdb.ada/scalar_storage.exp |  3 +++
 gdb/testsuite/gdb.ada/win_fu_syms.exp    |  3 +++
 gdb/testsuite/lib/ada.exp                | 18 +++++++++++++++++-
 6 files changed, 59 insertions(+), 4 deletions(-)

diff --git a/gdb/testsuite/boards/gnat-llvm.exp b/gdb/testsuite/boards/gnat-llvm.exp
new file mode 100644
index 00000000000..f2cfe124359
--- /dev/null
+++ b/gdb/testsuite/boards/gnat-llvm.exp
@@ -0,0 +1,29 @@
+# Copyright 2024 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This file is a dejagnu "board file" and is used to run the testsuite
+# with gnat-llvm.
+
+load_board_description "local-board"
+
+# This is based on baseboards/unix.exp.
+# At the moment we only support systems that unix.exp supports.
+load_generic_config "unix"
+process_multilib_options ""
+
+set GNATMAKE_FOR_TARGET llvm-gnatmake
+
+load_lib ada.exp
+set is_gnat_llvm 1
diff --git a/gdb/testsuite/gdb.ada/bias.exp b/gdb/testsuite/gdb.ada/bias.exp
index 1b8b917444a..4da4070454a 100644
--- a/gdb/testsuite/gdb.ada/bias.exp
+++ b/gdb/testsuite/gdb.ada/bias.exp
@@ -19,8 +19,12 @@ require allow_ada_tests
 
 standard_ada_testfile bias
 
-if {[gdb_compile_ada "${srcfile}" "${binfile}" executable \
-	 {debug additional_flags=-fgnat-encodings=minimal}] != "" } {
+set flags {debug}
+if {!$::is_gnat_llvm} {
+    lappend flags additional_flags=-fgnat-encodings=minimal
+}
+
+if {[gdb_compile_ada "${srcfile}" "${binfile}" executable $flags] != ""} {
   return -1
 }
 
diff --git a/gdb/testsuite/gdb.ada/finish-large.exp b/gdb/testsuite/gdb.ada/finish-large.exp
index b9823d313c4..a40d12808f2 100644
--- a/gdb/testsuite/gdb.ada/finish-large.exp
+++ b/gdb/testsuite/gdb.ada/finish-large.exp
@@ -21,7 +21,7 @@ standard_ada_testfile p
 
 set flags {debug}
 
-if {[have_fvar_tracking]} {
+if {[have_fvar_tracking] && !$is_gnat_llvm} {
   lappend flags "additional_flags=-fvar-tracking"
 }
 
diff --git a/gdb/testsuite/gdb.ada/scalar_storage.exp b/gdb/testsuite/gdb.ada/scalar_storage.exp
index e01e75fe5d2..435c0a768a1 100644
--- a/gdb/testsuite/gdb.ada/scalar_storage.exp
+++ b/gdb/testsuite/gdb.ada/scalar_storage.exp
@@ -20,6 +20,9 @@ load_lib "ada.exp"
 
 require allow_ada_tests
 
+# LLVM does not support scalar storage order.
+require !ada_llvm
+
 standard_ada_testfile storage
 
 if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug ]] != "" } {
diff --git a/gdb/testsuite/gdb.ada/win_fu_syms.exp b/gdb/testsuite/gdb.ada/win_fu_syms.exp
index 527a4496649..c2ec349f19a 100644
--- a/gdb/testsuite/gdb.ada/win_fu_syms.exp
+++ b/gdb/testsuite/gdb.ada/win_fu_syms.exp
@@ -17,6 +17,9 @@ load_lib "ada.exp"
 
 require allow_ada_tests
 
+# Currently gnat-llvm does not supply a shared libgnat.
+require !ada_llvm
+
 standard_ada_testfile foo
 
 if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug additional_flags=-bargs additional_flags=-shared additional_flags=-margs]] != "" } {
diff --git a/gdb/testsuite/lib/ada.exp b/gdb/testsuite/lib/ada.exp
index 0544544acbe..544660def86 100644
--- a/gdb/testsuite/lib/ada.exp
+++ b/gdb/testsuite/lib/ada.exp
@@ -13,6 +13,15 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+# When non-zero, assume gnat-llvm.  See foreach_gnat_encoding.
+set is_gnat_llvm 0
+
+# Return the value of is_gnat_llvm.  Useful with 'require'.
+
+proc ada_llvm {} {
+    return $::is_gnat_llvm
+}
+
 # A wrapper for foreach_with_prefix that applies suitable
 # -fgnat-encodings arguments to a command line.  SCENARIO_ARG is the
 # name of a loop variable that will hold the scenario currently being
@@ -21,11 +30,18 @@
 # to run, and BODY is what actually does the work.
 
 proc foreach_gnat_encoding {scenario_arg flags_arg list body} {
+    # gnat-llvm does not understand -fgnat-encodings at all.  However,
+    # some tests examine the precise setting of the scenario -- so
+    # pretend we support minimal.
+    if {$::is_gnat_llvm} {
+	set list {minimal}
+    }
+
     upvar 1 $scenario_arg scenario
     upvar 1 $flags_arg flags
     foreach_with_prefix scenario $list {
 	set flags {}
-	if {$scenario != "none"} {
+	if {$scenario != "none" && !$::is_gnat_llvm} {
 	    lappend flags additional_flags=-fgnat-encodings=$scenario
 	}
 	uplevel 1 $body

-- 
2.44.0