Fix various tests to use -no-pie linker flag when needed

Various tests use test code written in i386 / x86_64 assembly that cannot
be used to create PIE executables. Therefore compilation of test programs
failed on systems where the compiler default is to create PIE executable.

The solution is to use -no-pie linker flag, however, such flag may not
(is not) supported by all compilers GDB needs to support (e.g. gcc 4.8).
To handle this, introduce a new flag to gdb_compile - nopie - which
inserts -no-pie linker flag where supported and is no-op where it is
not. By default, -no-pie flag is inserted since most modern compiler do
support it.

9 files changed, 38 insertions, 7 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index f3224d4..1ac687e 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,16 @@
+2018-12-21  Jan Vrany  <jan.vrany@fit.cvut.cz>
+
+	* lib/gdb.exp (gdb_compile): Add new nopie flag enforce
+	non-PIE executables.
+	* README: Mention the gdb,nopie_flag board setting.
+	* gdb.arch/amd64-disp-step.exp: Use nopie flag to enforce
+	non-PIE executable.
+	* gdb.arch/amd64-entry-value.exp: Likewise.
+	* gdb.arch/amd64-invalid-stack-middle.exp: Likewise.
+	* gdb.arch/i386-float.exp: Likewise.
+	* gdb.arch/i386-signal.exp: Likewise.
+	* gdb.mi/mi-reg-undefined.exp: Likewise.
+
 2018-12-21  Paul Marechal  <paul.marechal@ericsson.com>
 
 	PR gdb/23974
diff --git a/gdb/testsuite/README b/gdb/testsuite/README
index 723d8ba..b5e75b9 100644
--- a/gdb/testsuite/README
+++ b/gdb/testsuite/README
@@ -482,6 +482,11 @@ gdb,no_thread_names
 
   The target doesn't support thread names.
 
+gdb,nopie_flag
+
+  The flag required to force the compiler to produce non-position-independent
+  executables.
+
 Testsuite Organization
 **********************
 
diff --git a/gdb/testsuite/gdb.arch/amd64-disp-step.exp b/gdb/testsuite/gdb.arch/amd64-disp-step.exp
index 782b758..0b941e7 100644
--- a/gdb/testsuite/gdb.arch/amd64-disp-step.exp
+++ b/gdb/testsuite/gdb.arch/amd64-disp-step.exp
@@ -25,9 +25,10 @@ if { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
 
 set newline "\[\r\n\]*"
 
+set opts {debug nopie}
 standard_testfile .S
 
-if { [prepare_for_testing "failed to prepare" $testfile $srcfile] } {
+if { [prepare_for_testing "failed to prepare" $testfile $srcfile $opts] } {
     return -1
 }
 
diff --git a/gdb/testsuite/gdb.arch/amd64-entry-value.exp b/gdb/testsuite/gdb.arch/amd64-entry-value.exp
index 72700d5..a8d7d4e 100644
--- a/gdb/testsuite/gdb.arch/amd64-entry-value.exp
+++ b/gdb/testsuite/gdb.arch/amd64-entry-value.exp
@@ -14,7 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 standard_testfile .s
-set opts {}
+set opts {nopie}
 
 if [info exists COMPILE] {
     # make check RUNTESTFLAGS="gdb.arch/amd64-entry-value.exp COMPILE=1"
diff --git a/gdb/testsuite/gdb.arch/amd64-invalid-stack-middle.exp b/gdb/testsuite/gdb.arch/amd64-invalid-stack-middle.exp
index 2bb0344..db4d9d7 100644
--- a/gdb/testsuite/gdb.arch/amd64-invalid-stack-middle.exp
+++ b/gdb/testsuite/gdb.arch/amd64-invalid-stack-middle.exp
@@ -27,7 +27,6 @@
 # run twice, and we restart gdb before testing each different command to
 # ensure that nothing is being cached.
 
-set opts {}
 standard_testfile .S
 
 if { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
@@ -35,7 +34,7 @@ if { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
     return
 }
 
-if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} $opts] } {
+if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} {nopie}] } {
     return -1
 }
 
diff --git a/gdb/testsuite/gdb.arch/i386-float.exp b/gdb/testsuite/gdb.arch/i386-float.exp
index 87c90c3..f0d05f3 100644
--- a/gdb/testsuite/gdb.arch/i386-float.exp
+++ b/gdb/testsuite/gdb.arch/i386-float.exp
@@ -28,7 +28,7 @@ standard_testfile .S
 # some targets have leading underscores on assembly symbols.
 set additional_flags [gdb_target_symbol_prefix_flags_asm]
 
-if { [prepare_for_testing "failed to prepare" $testfile $srcfile [list debug $additional_flags]] } {
+if { [prepare_for_testing "failed to prepare" $testfile $srcfile [list debug nopie $additional_flags]] } {
     return -1
 }
 
diff --git a/gdb/testsuite/gdb.arch/i386-signal.exp b/gdb/testsuite/gdb.arch/i386-signal.exp
index 38046a1..d7acb04 100644
--- a/gdb/testsuite/gdb.arch/i386-signal.exp
+++ b/gdb/testsuite/gdb.arch/i386-signal.exp
@@ -23,7 +23,7 @@ if { ![istarget "i?86-*-*"] && ![istarget "x86_64-*-*"] } then {
 standard_testfile
 
 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
-	  executable { debug }] != "" } {
+	  executable { debug nopie }] != "" } {
     untested "failed to compile"
     return -1
 }
diff --git a/gdb/testsuite/gdb.mi/mi-reg-undefined.exp b/gdb/testsuite/gdb.mi/mi-reg-undefined.exp
index 83abab1..e7f0b54 100644
--- a/gdb/testsuite/gdb.mi/mi-reg-undefined.exp
+++ b/gdb/testsuite/gdb.mi/mi-reg-undefined.exp
@@ -33,7 +33,7 @@ if [mi_gdb_start] {
 
 standard_testfile .S
 
-if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
+if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug nopie}] != "" } {
      untested "failed to compile"
      return -1
 }
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 5a5713b..c5fda74 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -3482,6 +3482,7 @@ set gdb_saved_set_unbuffered_mode_obj ""
 #     dynamically load libraries at runtime.  For example, on Linux, this adds
 #     -ldl so that the test can use dlopen.
 #   - nowarnings:  Inhibit all compiler warnings.
+#   - nopie: Prevent creation of PIE executables.
 #
 # And here are some of the not too obscure options understood by DejaGnu that
 # influence the compilation:
@@ -3603,6 +3604,18 @@ proc gdb_compile {source dest type options} {
 	set options [lreplace $options $nowarnings $nowarnings $flag]
     }
 
+    # Replace the "nopie" option with the appropriate additional_flags
+    # to disable PIE executables.
+    set nopie [lsearch -exact $options nopie]
+    if {$nopie != -1} {
+	if [target_info exists gdb,nopie_flag] {
+	    set flag "ldflags=[target_info gdb,nopie_flag]"
+	} else {
+	    set flag "ldflags=-no-pie"
+	}
+	set options [lreplace $options $nopie $nopie $flag]
+    }
+
     if { $type == "executable" } {
 	if { ([istarget "*-*-mingw*"]
 	      || [istarget "*-*-*djgpp"]