[1/2] Introduce and use foreach_gnat_encoding

diff --git a/gdb/testsuite/gdb.ada/O2_float_param.exp b/gdb/testsuite/gdb.ada/O2_float_param.exp
index d44f2e57217..86b67ff4626 100644
--- a/gdb/testsuite/gdb.ada/O2_float_param.exp
+++ b/gdb/testsuite/gdb.ada/O2_float_param.exp
@@ -26,10 +26,8 @@  if {[is_aarch64_target]} {
     }
 }
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug \
-		   optimize=-O2 \
-		   additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug optimize=-O2
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/access_to_unbounded_array.exp b/gdb/testsuite/gdb.ada/access_to_unbounded_array.exp
index 7f7bfb3ba4c..eeaceb018ed 100644
--- a/gdb/testsuite/gdb.ada/access_to_unbounded_array.exp
+++ b/gdb/testsuite/gdb.ada/access_to_unbounded_array.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/arr_acc_idx_w_gap.exp b/gdb/testsuite/gdb.ada/arr_acc_idx_w_gap.exp
index 569bb2ec556..4ecb4f8cd78 100644
--- a/gdb/testsuite/gdb.ada/arr_acc_idx_w_gap.exp
+++ b/gdb/testsuite/gdb.ada/arr_acc_idx_w_gap.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile enum_with_gap_main
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" \
 	     executable $flags] != ""} {
diff --git a/gdb/testsuite/gdb.ada/arr_enum_idx_w_gap.exp b/gdb/testsuite/gdb.ada/arr_enum_idx_w_gap.exp
index 5a88f5f3ca9..491402bd78a 100644
--- a/gdb/testsuite/gdb.ada/arr_enum_idx_w_gap.exp
+++ b/gdb/testsuite/gdb.ada/arr_enum_idx_w_gap.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo_q418_043
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/array_of_symbolic_length.exp b/gdb/testsuite/gdb.ada/array_of_symbolic_length.exp
index bcf73690801..134b448e64a 100644
--- a/gdb/testsuite/gdb.ada/array_of_symbolic_length.exp
+++ b/gdb/testsuite/gdb.ada/array_of_symbolic_length.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/array_of_variable_length.exp b/gdb/testsuite/gdb.ada/array_of_variable_length.exp
index 3397760e16c..3c68c805a12 100644
--- a/gdb/testsuite/gdb.ada/array_of_variable_length.exp
+++ b/gdb/testsuite/gdb.ada/array_of_variable_length.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/array_of_variant.exp b/gdb/testsuite/gdb.ada/array_of_variant.exp
index 1a155d416db..f93260af940 100644
--- a/gdb/testsuite/gdb.ada/array_of_variant.exp
+++ b/gdb/testsuite/gdb.ada/array_of_variant.exp
@@ -40,8 +40,8 @@  proc gdb_test_with_xfail { cmd re re_xfail msg } {
     }
 }
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/array_ptr_renaming.exp b/gdb/testsuite/gdb.ada/array_ptr_renaming.exp
index b013fc7e3b6..eadfcb64891 100644
--- a/gdb/testsuite/gdb.ada/array_ptr_renaming.exp
+++ b/gdb/testsuite/gdb.ada/array_ptr_renaming.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/arrayparam.exp b/gdb/testsuite/gdb.ada/arrayparam.exp
index 2921d64bef1..ef00037be90 100644
--- a/gdb/testsuite/gdb.ada/arrayparam.exp
+++ b/gdb/testsuite/gdb.ada/arrayparam.exp
@@ -22,8 +22,8 @@  standard_ada_testfile foo
 # Note we don't test the "none" (no -fgnat-encodings option) scenario
 # here, because "all" and "minimal" cover the cases, and this way we
 # don't have to update the test when gnat changes its default.
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/arrayptr.exp b/gdb/testsuite/gdb.ada/arrayptr.exp
index ca48993439b..335573b31a7 100644
--- a/gdb/testsuite/gdb.ada/arrayptr.exp
+++ b/gdb/testsuite/gdb.ada/arrayptr.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/big_packed_array.exp b/gdb/testsuite/gdb.ada/big_packed_array.exp
index 1ba2c4853c8..0078c77de6a 100644
--- a/gdb/testsuite/gdb.ada/big_packed_array.exp
+++ b/gdb/testsuite/gdb.ada/big_packed_array.exp
@@ -21,8 +21,8 @@  standard_ada_testfile foo_ra24_010
 
 set old_gcc [expr [test_compiler_info {gcc-[0-8]-*}]]
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/enum_idx_packed.exp b/gdb/testsuite/gdb.ada/enum_idx_packed.exp
index 1976092c13b..d56d73bf9bc 100644
--- a/gdb/testsuite/gdb.ada/enum_idx_packed.exp
+++ b/gdb/testsuite/gdb.ada/enum_idx_packed.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/fixed_cmp.exp b/gdb/testsuite/gdb.ada/fixed_cmp.exp
index de506fdfd99..dcd47455302 100644
--- a/gdb/testsuite/gdb.ada/fixed_cmp.exp
+++ b/gdb/testsuite/gdb.ada/fixed_cmp.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile fixed
 
-foreach_with_prefix gnat_encodings {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$gnat_encodings]
+foreach_gnat_encoding gnat_encodings flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${gnat_encodings}" executable $flags] != "" } {
       return -1
diff --git a/gdb/testsuite/gdb.ada/fixed_points.exp b/gdb/testsuite/gdb.ada/fixed_points.exp
index 4665595f6f8..ceed34acbc5 100644
--- a/gdb/testsuite/gdb.ada/fixed_points.exp
+++ b/gdb/testsuite/gdb.ada/fixed_points.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile fixed_points
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
     }
diff --git a/gdb/testsuite/gdb.ada/frame_arg_lang.exp b/gdb/testsuite/gdb.ada/frame_arg_lang.exp
index 918a922ca2f..b629c429ac8 100644
--- a/gdb/testsuite/gdb.ada/frame_arg_lang.exp
+++ b/gdb/testsuite/gdb.ada/frame_arg_lang.exp
@@ -27,11 +27,10 @@  gdb_compile "${csrcfile}" "${cobject}" object [list debug]
 # Note we don't test the "none" (no -fgnat-encodings option) scenario
 # here, because "all" and "minimal" cover the cases, and this way we
 # don't have to update the test when gnat changes its default.
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-largs \
-		   additional_flags=${cobject} \
-		   additional_flags=-margs \
-		   additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug additional_flags=-largs \
+	additional_flags=${cobject} \
+	additional_flags=-margs
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/funcall_ref.exp b/gdb/testsuite/gdb.ada/funcall_ref.exp
index 518ceb7118f..1c283923021 100644
--- a/gdb/testsuite/gdb.ada/funcall_ref.exp
+++ b/gdb/testsuite/gdb.ada/funcall_ref.exp
@@ -22,8 +22,8 @@  standard_ada_testfile foo
 # Note we don't test the "none" (no -fgnat-encodings option) scenario
 # here, because "all" and "minimal" cover the cases, and this way we
 # don't have to update the test when gnat changes its default.
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/mi_string_access.exp b/gdb/testsuite/gdb.ada/mi_string_access.exp
index 15b8cf153f4..8fd116b545c 100644
--- a/gdb/testsuite/gdb.ada/mi_string_access.exp
+++ b/gdb/testsuite/gdb.ada/mi_string_access.exp
@@ -22,8 +22,8 @@  standard_ada_testfile bar
 load_lib mi-support.exp
 set MIFLAGS "-i=mi"
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/mi_var_array.exp b/gdb/testsuite/gdb.ada/mi_var_array.exp
index 2b504815099..dd770a11718 100644
--- a/gdb/testsuite/gdb.ada/mi_var_array.exp
+++ b/gdb/testsuite/gdb.ada/mi_var_array.exp
@@ -22,11 +22,8 @@  standard_ada_testfile bar
 load_lib mi-support.exp
 set MIFLAGS "-i=mi"
 
-foreach_with_prefix scenario {none all minimal} {
-    set flags {debug}
-    if {$scenario != "none"} {
-	lappend flags additional_flags=-fgnat-encodings=$scenario
-    }
+foreach_gnat_encoding scenario flags {none all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != "" } {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/mi_var_union.exp b/gdb/testsuite/gdb.ada/mi_var_union.exp
index eb23c0a4a65..64bfe3355e7 100644
--- a/gdb/testsuite/gdb.ada/mi_var_union.exp
+++ b/gdb/testsuite/gdb.ada/mi_var_union.exp
@@ -24,11 +24,8 @@  set MIFLAGS "-i=mi"
 
 set float "\\-?((\[0-9\]+(\\.\[0-9\]+)?(e\[-+\]\[0-9\]+)?)|(nan\\($hex\\)))"
 
-foreach_with_prefix scenario {none all minimal} {
-    set flags {debug}
-    if {$scenario != "none"} {
-	lappend flags additional_flags=-fgnat-encodings=$scenario
-    }
+foreach_gnat_encoding scenario flags {none all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != "" } {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/mi_variant.exp b/gdb/testsuite/gdb.ada/mi_variant.exp
index 7f10b3c511f..f4be5a0b110 100644
--- a/gdb/testsuite/gdb.ada/mi_variant.exp
+++ b/gdb/testsuite/gdb.ada/mi_variant.exp
@@ -23,11 +23,8 @@  standard_ada_testfile pkg
 load_lib mi-support.exp
 set MIFLAGS "-i=mi"
 
-foreach_with_prefix scenario {none all minimal} {
-    set flags {debug}
-    if {$scenario != "none"} {
-	lappend flags additional_flags=-fgnat-encodings=$scenario
-    }
+foreach_gnat_encoding scenario flags {none all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/mod_from_name.exp b/gdb/testsuite/gdb.ada/mod_from_name.exp
index c6acc802bbf..33bd854d3ba 100644
--- a/gdb/testsuite/gdb.ada/mod_from_name.exp
+++ b/gdb/testsuite/gdb.ada/mod_from_name.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/multiarray.exp b/gdb/testsuite/gdb.ada/multiarray.exp
index 34756476ff7..3c625151ed2 100644
--- a/gdb/testsuite/gdb.ada/multiarray.exp
+++ b/gdb/testsuite/gdb.ada/multiarray.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile p
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable {debug}] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/out_of_line_in_inlined.exp b/gdb/testsuite/gdb.ada/out_of_line_in_inlined.exp
index eaa88a30774..2adef97e763 100644
--- a/gdb/testsuite/gdb.ada/out_of_line_in_inlined.exp
+++ b/gdb/testsuite/gdb.ada/out_of_line_in_inlined.exp
@@ -19,10 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo_o224_021
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug \
-		   optimize=-O2 \
-		   additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug optimize=-O2
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/packed_array.exp b/gdb/testsuite/gdb.ada/packed_array.exp
index a3d7136c163..85bc59db882 100644
--- a/gdb/testsuite/gdb.ada/packed_array.exp
+++ b/gdb/testsuite/gdb.ada/packed_array.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile pa
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/packed_record.exp b/gdb/testsuite/gdb.ada/packed_record.exp
index fa058f70524..bbba9b25c54 100644
--- a/gdb/testsuite/gdb.ada/packed_record.exp
+++ b/gdb/testsuite/gdb.ada/packed_record.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile pr
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/packed_tagged.exp b/gdb/testsuite/gdb.ada/packed_tagged.exp
index faccc1476d4..1c9e5a07703 100644
--- a/gdb/testsuite/gdb.ada/packed_tagged.exp
+++ b/gdb/testsuite/gdb.ada/packed_tagged.exp
@@ -22,11 +22,8 @@  standard_ada_testfile comp_bug
 # Note we don't test the "none" (no -fgnat-encodings option) scenario
 # here, because "all" and "minimal" cover the cases, and this way we
 # don't have to update the test when gnat changes its default.
-foreach_with_prefix scenario {all minimal} {
-    set flags {debug}
-    if {$scenario != "none"} {
-	lappend flags additional_flags=-fgnat-encodings=$scenario
-    }
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/pckd_arr_ren.exp b/gdb/testsuite/gdb.ada/pckd_arr_ren.exp
index 083ee132714..18bb84f848a 100644
--- a/gdb/testsuite/gdb.ada/pckd_arr_ren.exp
+++ b/gdb/testsuite/gdb.ada/pckd_arr_ren.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/ptype-o.exp b/gdb/testsuite/gdb.ada/ptype-o.exp
index f7782199d58..5038ee171d2 100644
--- a/gdb/testsuite/gdb.ada/ptype-o.exp
+++ b/gdb/testsuite/gdb.ada/ptype-o.exp
@@ -21,8 +21,8 @@  require allow_ada_tests
 
 standard_ada_testfile prog
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/rec_ptype.exp b/gdb/testsuite/gdb.ada/rec_ptype.exp
index f75d09b16ef..fc7bb8b5fac 100644
--- a/gdb/testsuite/gdb.ada/rec_ptype.exp
+++ b/gdb/testsuite/gdb.ada/rec_ptype.exp
@@ -22,8 +22,8 @@  standard_ada_testfile main
 # Note we don't test the "none" (no -fgnat-encodings option) scenario
 # here, because "all" and "minimal" cover the cases, and this way we
 # don't have to update the test when gnat changes its default.
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/same_component_name.exp b/gdb/testsuite/gdb.ada/same_component_name.exp
index 7167a4124d1..84a48b4fd0e 100644
--- a/gdb/testsuite/gdb.ada/same_component_name.exp
+++ b/gdb/testsuite/gdb.ada/same_component_name.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != "" } {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/set_pckd_arr_elt.exp b/gdb/testsuite/gdb.ada/set_pckd_arr_elt.exp
index d77f8fe6896..2979cb99e83 100644
--- a/gdb/testsuite/gdb.ada/set_pckd_arr_elt.exp
+++ b/gdb/testsuite/gdb.ada/set_pckd_arr_elt.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/unc_arr_ptr_in_var_rec.exp b/gdb/testsuite/gdb.ada/unc_arr_ptr_in_var_rec.exp
index 6b2a6fdfa9a..2bcc027cec4 100644
--- a/gdb/testsuite/gdb.ada/unc_arr_ptr_in_var_rec.exp
+++ b/gdb/testsuite/gdb.ada/unc_arr_ptr_in_var_rec.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/unchecked_union.exp b/gdb/testsuite/gdb.ada/unchecked_union.exp
index bff71bdaa2f..5d3256bd52e 100644
--- a/gdb/testsuite/gdb.ada/unchecked_union.exp
+++ b/gdb/testsuite/gdb.ada/unchecked_union.exp
@@ -51,11 +51,8 @@  set pair_string {    case ? is
 }
 set pair_full "type = record\n${inner_string}${pair_string}end record"
 
-foreach_with_prefix scenario {none all minimal} {
-    set flags {debug}
-    if {$scenario != "none"} {
-	lappend flags additional_flags=-fgnat-encodings=$scenario
-    }
+foreach_gnat_encoding scenario flags {none all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/var_rec_arr.exp b/gdb/testsuite/gdb.ada/var_rec_arr.exp
index a8591089ba8..20598ea708c 100644
--- a/gdb/testsuite/gdb.ada/var_rec_arr.exp
+++ b/gdb/testsuite/gdb.ada/var_rec_arr.exp
@@ -22,8 +22,8 @@  standard_ada_testfile foo_na09_042
 # Note we don't test the "none" (no -fgnat-encodings option) scenario
 # here, because "all" and "minimal" cover the cases, and this way we
 # don't have to update the test when gnat changes its default.
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/variant.exp b/gdb/testsuite/gdb.ada/variant.exp
index 9fbc449758a..227331c3ac0 100644
--- a/gdb/testsuite/gdb.ada/variant.exp
+++ b/gdb/testsuite/gdb.ada/variant.exp
@@ -20,11 +20,8 @@  require allow_ada_tests
 
 standard_ada_testfile pkg
 
-foreach_with_prefix scenario {none all minimal} {
-    set flags {debug}
-    if {$scenario != "none"} {
-	lappend flags additional_flags=-fgnat-encodings=$scenario
-    }
+foreach_gnat_encoding scenario flags {none all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/gdb.ada/variant_record_packed_array.exp b/gdb/testsuite/gdb.ada/variant_record_packed_array.exp
index f6b4e4171a8..8f4192cfd49 100644
--- a/gdb/testsuite/gdb.ada/variant_record_packed_array.exp
+++ b/gdb/testsuite/gdb.ada/variant_record_packed_array.exp
@@ -19,8 +19,8 @@  require allow_ada_tests
 
 standard_ada_testfile foo
 
-foreach_with_prefix scenario {all minimal} {
-    set flags [list debug additional_flags=-fgnat-encodings=$scenario]
+foreach_gnat_encoding scenario flags {all minimal} {
+    lappend flags debug
 
     if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
 	return -1
diff --git a/gdb/testsuite/lib/ada.exp b/gdb/testsuite/lib/ada.exp
index 1bc0dc1d438..0544544acbe 100644
--- a/gdb/testsuite/lib/ada.exp
+++ b/gdb/testsuite/lib/ada.exp
@@ -13,6 +13,25 @@ 
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+# 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
+# evaluated.  FLAGS_ARG will be set to the appropriate compiler flags
+# (if any) for this scenario.  LIST is the list of desired scenarios
+# to run, and BODY is what actually does the work.
+
+proc foreach_gnat_encoding {scenario_arg flags_arg list body} {
+    upvar 1 $scenario_arg scenario
+    upvar 1 $flags_arg flags
+    foreach_with_prefix scenario $list {
+	set flags {}
+	if {$scenario != "none"} {
+	    lappend flags additional_flags=-fgnat-encodings=$scenario
+	}
+	uplevel 1 $body
+    }
+}
+
 # Call target_compile with SOURCE DEST TYPE and OPTIONS as argument,
 # after having temporarily changed the current working directory to
 # BUILDDIR.