From 0fe69a94d4c4793d7247442e0611e5d3b8f542f5 Mon Sep 17 00:00:00 2001
From: Markus Metzger <markus.t.metzger@intel.com>
Date: Fri, 4 Dec 2020 10:29:06 +0100
Subject: [PATCH] testsuite, gdb.btrace: fix 32-bit PIE false positives

For 32-bit position independent executables, GCC generates an extra call to

    __x86.get_pc_thunk.<reg>

which appears in the function call history.  It is correct to appear there
but this confuses the tests, which check for an expected sequence of
functions.

Build with nopie to avoid this complication.

gdb/testsuite/ChangeLog:
2020-12-04  Markus Metzger  <markus.t.metzger@intel.com>

	* gdb.btrace/exception.exp: Build with nopie.
	* gdb.btrace/function_call_history.exp: Likewise.
	* gdb.btrace/unknown_functions.exp: Likewise.
---
 gdb/testsuite/ChangeLog                            | 6 ++++++
 gdb/testsuite/gdb.btrace/exception.exp             | 5 ++++-
 gdb/testsuite/gdb.btrace/function_call_history.exp | 4 +++-
 gdb/testsuite/gdb.btrace/unknown_functions.exp     | 9 ++++++---
 4 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 4a6d48e2af7..2c0633d1fc2 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2020-12-21  Markus Metzger  <markus.t.metzger@intel.com>
+
+	* gdb.btrace/exception.exp: Build with nopie.
+	* gdb.btrace/function_call_history.exp: Likewise.
+	* gdb.btrace/unknown_functions.exp: Likewise.
+
 2020-12-21  Markus Metzger  <markus.t.metzger@intel.com>
 
 	* gdb.btrace/multi-inferior.exp: Skip if use_gdb_stub.
diff --git a/gdb/testsuite/gdb.btrace/exception.exp b/gdb/testsuite/gdb.btrace/exception.exp
index 0d242227938..dc1a68cdb68 100755
--- a/gdb/testsuite/gdb.btrace/exception.exp
+++ b/gdb/testsuite/gdb.btrace/exception.exp
@@ -22,8 +22,11 @@ if { [skip_btrace_tests] } {
     return -1
 }
 
+# We expect a specific function call history.  This gets messed up with
+# PIE on 32-bit.
 standard_testfile exception.cc
-if [prepare_for_testing "failed to prepare" $testfile $srcfile {c++ debug}] {
+if [prepare_for_testing "failed to prepare" $testfile $srcfile \
+	{nopie c++ debug}] {
     return -1
 }
 
diff --git a/gdb/testsuite/gdb.btrace/function_call_history.exp b/gdb/testsuite/gdb.btrace/function_call_history.exp
index 51536ff6035..871d37ba031 100644
--- a/gdb/testsuite/gdb.btrace/function_call_history.exp
+++ b/gdb/testsuite/gdb.btrace/function_call_history.exp
@@ -22,8 +22,10 @@ if { [skip_btrace_tests] } {
     return -1
 }
 
+# We expect a specific function call history.  This gets messed up with
+# PIE on 32-bit.
 standard_testfile
-if [prepare_for_testing "failed to prepare" $testfile {} {debug}] {
+if [prepare_for_testing "failed to prepare" $testfile {} {nopie debug}] {
     return -1
 }
 
diff --git a/gdb/testsuite/gdb.btrace/unknown_functions.exp b/gdb/testsuite/gdb.btrace/unknown_functions.exp
index 4db9c70f496..beb1acaedee 100644
--- a/gdb/testsuite/gdb.btrace/unknown_functions.exp
+++ b/gdb/testsuite/gdb.btrace/unknown_functions.exp
@@ -24,9 +24,12 @@ if { [skip_btrace_tests] } {
 
 standard_testfile
 
-# discard local symbols
-set ldflags "additional_flags=-Wl,-x"
-if [prepare_for_testing "failed to prepare" $testfile $srcfile $ldflags] {
+# We expect a specific function call history.  This gets messed up with
+# PIE on 32-bit.
+#
+# Also discard local symbols.
+if [prepare_for_testing "failed to prepare" $testfile $srcfile \
+	{additional_flags=-Wl,-x nopie}] {
     return -1
 }
 
-- 
2.30.2