[binutils-gdb] [gdb/testsuite] Update psym-external-decl.exp for gcc-10/clang

[gdb-buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 8caf140db24116e8874099291a7a48644c368ab6 ***

commit 8caf140db24116e8874099291a7a48644c368ab6
Author:     Tom de Vries <tdevries@suse.de>
AuthorDate: Sat May 2 09:50:50 2020 +0200
Commit:     Tom de Vries <tdevries@suse.de>
CommitDate: Sat May 2 09:50:50 2020 +0200

    [gdb/testsuite] Update psym-external-decl.exp for gcc-10/clang
    
    When running test-case gdb.base/psym-external-decl.exp with gcc-10, we have:
    ...
    (gdb) print aaa^M
    'aaa' has unknown type; cast it to its declared type^M
    (gdb) FAIL: gdb.base/psym-external-decl.exp: print aaa
    ...
    
    With an an earlier version, gcc still emits the debug info for the
    declaration of aaa:
    ...
     <0><d2>: Abbrev Number: 1 (DW_TAG_compile_unit)
        <d8>   DW_AT_name        : psym-external-decl.c
     <1><f4>: Abbrev Number: 2 (DW_TAG_variable)
        <f5>   DW_AT_name        : aaa
        <ff>   DW_AT_external    : 1
        <ff>   DW_AT_declaration : 1
    ...
    but with gcc-10 that's no longer the case.
    
    Fix the test-case by adding a use of aaa in psym-external-decl.c.
    
    That still doesn't work for clang, so skip test in that case.
    
    Tested with x86_64-linux, with gcc 7.5.0, gcc 10.0.0 and clang 5.0.2.
    
    Also tested by reverting corresponding fix and ensuring test-case still
    fails.
    
    gdb/testsuite/ChangeLog:
    
    2020-05-02  Tom de Vries  <tdevries@suse.de>
    
            * gdb.base/psym-external-decl.c (main): Add use of variable aaa.

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 737caffa0e..e741fd6a7d 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2020-05-02  Tom de Vries  <tdevries@suse.de>
+
+	* gdb.base/psym-external-decl.c (main): Add use of variable aaa.
+
 2020-05-01  Tom de Vries  <tdevries@suse.de>
 
 	* gdb.ada/operator_bp.exp: Allow more than required amount of
diff --git a/gdb/testsuite/gdb.base/psym-external-decl.c b/gdb/testsuite/gdb.base/psym-external-decl.c
index 7a4b107774..e2374327bd 100644
--- a/gdb/testsuite/gdb.base/psym-external-decl.c
+++ b/gdb/testsuite/gdb.base/psym-external-decl.c
@@ -20,6 +20,6 @@ extern int aaa;
 int
 main (void)
 {
-  return 0;
+  return aaa;
 }
 
diff --git a/gdb/testsuite/gdb.base/psym-external-decl.exp b/gdb/testsuite/gdb.base/psym-external-decl.exp
index bbcc274575..d0388d5655 100644
--- a/gdb/testsuite/gdb.base/psym-external-decl.exp
+++ b/gdb/testsuite/gdb.base/psym-external-decl.exp
@@ -15,6 +15,11 @@
 
 standard_testfile .c psym-external-decl-2.c
 
+get_compiler_info
+if { [test_compiler_info "clang-*"] } {
+    return -1
+}
+
 set srcfiles [list $srcfile $srcfile2]
 
 if { [build_executable_from_specs \