[PATCH v3 07/14] Fix gdb.base/call-ar-st to work with Clang

[Bruno Larsen <blarsen@redhat.com>]

When running gdb.base/call-ar-st.exp against Clang, we see one FAIL,
like so:

 print_all_arrays (array_i=<main.integer_array>, array_c=<main.char_array> "ZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZa
 ZaZaZaZaZaZaZaZaZaZaZaZa", array_f=<main.float_array>, array_d=<main.double_array>) at ../../../src/gdb/testsuite/gdb.base/call-ar-st.c:274
 274       print_int_array(array_i);     /* -step1- */
 (gdb) FAIL: gdb.base/call-ar-st.exp: step inside print_all_arrays

With GCC we instead see:

 print_all_arrays (array_i=<integer_array>, array_c=<char_array> "ZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZa", array_f=<float_array>, array_d=<double_array>) at /home/pedro/gdb/build/gdb/testsuite/../../../src/gdb/testsuite/gdb.base/call-ar-st.c:274
 274       print_int_array(array_i);     /* -step1- */
 (gdb) PASS: gdb.base/call-ar-st.exp: step inside print_all_arrays

The difference is that with Clang we get:

 array_i=<main.integer_array>, ...

instead of

 array_i = <integer_array>, ...

These symbols are local static variables, and "main" is the name of
the function they are defined in.  GCC instead appends a sequence
number to the linkage name:

 $ nm -A call-ar-st.gcc | grep integer_
 call-ar-st/call-ar-st:00000000000061a0 b integer_array.3968

 $ nm -A call-ar-st.clang | grep integer_
 call-ar-st:00000000004061a0 b main.integer_array

This commit changes the testcase to accept both outputs, as they are
functionally identical.

Co-Authored-By: Pedro Alves <pedro@palves.net>
Change-Id: Iaf2ccdb9d5996e0268ed12f595a6e04b368bfcb4
---

No change in v3.

v2: Rewored the patch according to Pedro's suggestions.

---
 gdb/testsuite/gdb.base/call-ar-st.exp | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.base/call-ar-st.exp b/gdb/testsuite/gdb.base/call-ar-st.exp
index 239cfa4c518..0c7dcc7c36e 100644
--- a/gdb/testsuite/gdb.base/call-ar-st.exp
+++ b/gdb/testsuite/gdb.base/call-ar-st.exp
@@ -151,10 +151,21 @@ if {!$skip_float_test && \
     gdb_test "continue" ".*" ""
 }
 
+# Return a regexp that matches the linkage name of SYM, assuming SYM
+# is a local static variable inside the main function.
+proc main_static_local_re {sym} {
+    # Clang prepends the function name + '.'.
+    return "(main\\.)?${sym}"
+}
+
 #step
 set stop_line [gdb_get_line_number "-step1-"]
 gdb_test "step" \
-    "print_all_arrays \\(array_i=<integer_array.*>, array_c=<char_array.*> .ZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZa., array_f=<float_array.*>, array_d=<double_array.*>\\) at .*$srcfile:$stop_line\[ \t\r\n\]+$stop_line.*print_int_array\\(array_i\\);.*" \
+    "print_all_arrays \\(array_i=<[main_static_local_re integer_array]>,\
+			 array_c=<[main_static_local_re char_array]> .ZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZaZa.,\
+			 array_f=<[main_static_local_re float_array]>,\
+			 array_d=<[main_static_local_re double_array]>\\)\
+			 at .*$srcfile:$stop_line\[ \t\r\n\]+$stop_line.*print_int_array\\(array_i\\);.*" \
     "step inside print_all_arrays"
 
 #step -over
-- 
2.31.1