Fix calling debuginfo-less functions in Ada

A co-worker at AdaCore noticed that calling a function without
debuginfo yields:

(gdb) print plus_one(23)
'pck.plus_one' has unknown return type; cast the call to its declared return type

However, this also happens if you follow the directions and add the
cast.

This patch fixes the problem and adds a regression test.

6 files changed, 113 insertions, 2 deletions

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 50d5c6f9697..df5fd80414d 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -11228,7 +11228,7 @@ ada_funcall_operation::evaluate (struct type *expect_type,
 	    error_call_unknown_return_type (NULL);
 	  return value::allocate (type->target_type ());
 	}
-      return call_function_by_hand (callee, NULL, argvec);
+      return call_function_by_hand (callee, expect_type, argvec);
     case TYPE_CODE_INTERNAL_FUNCTION:
       if (noside == EVAL_AVOID_SIDE_EFFECTS)
 	/* We don't know anything about what the internal
diff --git a/gdb/testsuite/gdb.ada/call-no-debug.exp b/gdb/testsuite/gdb.ada/call-no-debug.exp
new file mode 100644
index 00000000000..422b83761d9
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/call-no-debug.exp
@@ -0,0 +1,45 @@
+# Copyright 2023 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/>.
+
+# Test calling a function without debug info.
+
+load_lib "ada.exp"
+
+require allow_ada_tests
+
+standard_ada_testfile prog
+
+# Compile pck without debuginfo but prog with it.
+if {[gdb_compile_ada $srcdir/$subdir/$testdir/pck.adb \
+	 [standard_output_file pck.o] object {}] != ""} {
+    return
+}
+
+if {[gdb_compile_ada "${srcfile}" "${binfile}" executable \
+	 {debug no-force}] != ""} {
+    return -1
+}
+
+clean_restart ${testfile}
+
+set bp_location [gdb_get_line_number "STOP" ${testdir}/prog.adb]
+runto "prog.adb:$bp_location"
+
+# Verify that the function was built without debuginfo.
+gdb_test "print plus_one(23)" \
+    "plus_one.* has unknown return type; cast the call to its declared return type" \
+    "call function without debuginfo"
+gdb_test "print integer (plus_one(23))" " = 24" \
+    "use cast to call function without debuginfo"
diff --git a/gdb/testsuite/gdb.ada/call-no-debug/pck.adb b/gdb/testsuite/gdb.ada/call-no-debug/pck.adb
new file mode 100644
index 00000000000..fb74d6c464e
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/call-no-debug/pck.adb
@@ -0,0 +1,21 @@
+--  Copyright 2023 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/>.
+
+package body Pck is
+   function Plus_One (A : Integer) return Integer is
+   begin
+      return A + 1;
+   end Plus_One;
+end Pck;
diff --git a/gdb/testsuite/gdb.ada/call-no-debug/pck.ads b/gdb/testsuite/gdb.ada/call-no-debug/pck.ads
new file mode 100644
index 00000000000..7b353de765c
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/call-no-debug/pck.ads
@@ -0,0 +1,18 @@
+--  Copyright 2023 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/>.
+
+package Pck is
+   function Plus_One (A : Integer) return Integer;
+end Pck;
diff --git a/gdb/testsuite/gdb.ada/call-no-debug/prog.adb b/gdb/testsuite/gdb.ada/call-no-debug/prog.adb
new file mode 100644
index 00000000000..27b7a7f02bf
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/call-no-debug/prog.adb
@@ -0,0 +1,22 @@
+--  Copyright 2023 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/>.
+
+with Pck; use Pck;
+
+procedure Prog is
+   X : Integer := Plus_One (23);
+begin
+   null;  -- STOP
+end Prog;
diff --git a/gdb/testsuite/lib/ada.exp b/gdb/testsuite/lib/ada.exp
index 4395f31ad94..b728e3a2aba 100644
--- a/gdb/testsuite/lib/ada.exp
+++ b/gdb/testsuite/lib/ada.exp
@@ -51,6 +51,9 @@ proc target_compile_ada_from_dir {builddir source dest type options} {
 }
 
 # Compile some Ada code.  Return "" if the compile was successful.
+# OPTIONS are as for target_compile, but with this addition:
+# "no-force" - do not pass -f to gnatmake.  By default -f is
+# used, forcing a full recompilation.
 
 proc gdb_compile_ada_1 {source dest type options} {
 
@@ -66,7 +69,9 @@ proc gdb_compile_ada_1 {source dest type options} {
     # and it avoids using a stray objfile file from a long-past
     # run, for instance.
     append options " ada"
-    append options " additional_flags=-f"
+    if {[lsearch -exact $options no-force] == -1} {
+	append options " additional_flags=-f"
+    }
     append options " additional_flags=-I$srcdir"
 
     set result [target_compile_ada_from_dir \