[gdb/testsuite] Handle older gcc in gdb.ada/import.exp

When running test-case gdb.ada/import.exp with gcc 7, most test fail:
...
FAIL: gdb.ada/import.exp: print imported_var_ada
FAIL: gdb.ada/import.exp: print local_imported_var
FAIL: gdb.ada/import.exp: print pkg.imported_var_ada
FAIL: gdb.ada/import.exp: print pkg.exported_var_ada
FAIL: gdb.ada/import.exp: print exported_var_ada
FAIL: gdb.ada/import.exp: gdb_breakpoint: set breakpoint at pkg.imported_func_ada
FAIL: gdb.ada/import.exp: gdb_breakpoint: set breakpoint at imported_func_ada
FAIL: gdb.ada/import.exp: gdb_breakpoint: set breakpoint at local_imported_func
...

When running with gcc 8 or 9, only 2 tests fail:
...
FAIL: gdb.ada/import.exp: gdb_breakpoint: set breakpoint at pkg.imported_func_ada
FAIL: gdb.ada/import.exp: gdb_breakpoint: set breakpoint at imported_func_ada
...

The test-case passes fully with gcc 10, 11, 12 and 13.

Debug info for pragma import seems to not have been supported before gcc 8, so
require that version.

The two FAILs with gcc 8 and 9 seem to be due to problems in debug info.  Add
an xfail for these.

Tested on x86_64-linux.

Approved-By: Tom Tromey <tom@tromey.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.ada/import.exp b/gdb/testsuite/gdb.ada/import.exp
index 90cffa4..7355248 100644
--- a/gdb/testsuite/gdb.ada/import.exp
+++ b/gdb/testsuite/gdb.ada/import.exp
@@ -17,6 +17,12 @@ load_lib "ada.exp"
 
 require allow_ada_tests
 
+# GCC with commit ff9baa5f1c5 ("DWARF: make it possible to emit debug info for
+# declarations only") is required.  The commit makes sure that file-scope
+# function and variable declarations are emitted in dwarf.  This allows the
+# description of imported entries, making them available to the debugger.
+require {expr [gcc_major_version] >= 8}
+
 standard_ada_testfile prog
 
 set cfile "inc"
@@ -48,8 +54,36 @@ gdb_test "print pkg.imported_var_ada" " = 42"
 gdb_test "print pkg.exported_var_ada" " = 99"
 gdb_test "print exported_var_ada" " = 99"
 
+# This passes with gcc 10 but fails with gcc 9.  With gcc 9, we have:
+#   <1><1659>: Abbrev Number: 4 (DW_TAG_subprogram)
+#      <165a>   DW_AT_external    : 1
+#      <165a>   DW_AT_name        : pkg__imported_func_ada
+#      <165e>   DW_AT_decl_file   : 2
+#      <165f>   DW_AT_decl_line   : 22
+#      <1660>   DW_AT_decl_column : 13
+#      <1661>   DW_AT_linkage_name: imported_func
+#      <1665>   DW_AT_type        : <0x1669>
+# and with gcc 10 instead:
+#   <1><1670>: Abbrev Number: 4 (DW_TAG_subprogram)
+#      <1671>   DW_AT_external    : 1
+#      <1671>   DW_AT_name        : pkg__imported_func_ada
+#      <1675>   DW_AT_decl_file   : 2
+#      <1676>   DW_AT_decl_line   : 22
+#      <1677>   DW_AT_decl_column : 13
+#      <1678>   DW_AT_linkage_name: imported_func
+#      <167c>   DW_AT_type        : <0x1680>
+#      <1680>   DW_AT_declaration : 1
+# The fact that things start to work when adding the DW_AT_declaration is
+# consistent with what is described in commit ff9baa5f1c5, so xfail this
+# (without pinpointing it to a specific gcc PR or commit).
+if { [gcc_major_version] < 10 } {
+    setup_xfail *-*-*
+}
 gdb_breakpoint "pkg.imported_func_ada" message
 gdb_breakpoint "imported_func" message
+if { [gcc_major_version] < 10 } {
+    setup_xfail *-*-*
+}
 gdb_breakpoint "imported_func_ada" message
 
 gdb_breakpoint "local_imported_func" message