x86: Run GNU2 TLS tests with working GNU2 TLS support

Check if GNU2 TLS really works before running GNU2 TLS tests.

	* testsuite/ld-i386/tls.exp: Run GNU2 TLS tests only if there
	is working GNU2 TLS support.
	* testsuite/ld-x86-64/tls.exp: Likewise.
	* testsuite/lib/ld-lib.exp (check_gnu2_tls_available): New proc.

4 files changed, 81 insertions, 0 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index e15ee0a..238404d 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,10 @@
+2017-05-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* testsuite/ld-i386/tls.exp: Run GNU2 TLS tests only if there
+	is working GNU2 TLS support.
+	* testsuite/ld-x86-64/tls.exp: Likewise.
+	* testsuite/lib/ld-lib.exp (check_gnu2_tls_available): New proc.
+
 2017-04-28  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* testsuite/config/default.exp (GNU2_CFLAGS): New.  Set
diff --git a/ld/testsuite/ld-i386/tls.exp b/ld/testsuite/ld-i386/tls.exp
index 504b0f6..7a99e46 100644
--- a/ld/testsuite/ld-i386/tls.exp
+++ b/ld/testsuite/ld-i386/tls.exp
@@ -177,6 +177,11 @@ run_ld_link_exec_tests [list \
     ] \
 ]
 
+# Run-time tests which require working GNU2 TLS support.
+if { ![check_gnu2_tls_available] } {
+    return
+}
+
 run_cc_link_tests [list \
     [list \
 	"Build libtlsdesc1.so" \
diff --git a/ld/testsuite/ld-x86-64/tls.exp b/ld/testsuite/ld-x86-64/tls.exp
index 6b4852b..5282146 100644
--- a/ld/testsuite/ld-x86-64/tls.exp
+++ b/ld/testsuite/ld-x86-64/tls.exp
@@ -201,6 +201,11 @@ run_cc_link_tests [list \
     ] \
 ]
 
+# Run-time tests which require working GNU2 TLS support.
+if { ![check_gnu2_tls_available] } {
+    return
+}
+
 run_ld_link_exec_tests [list \
     [list \
 	"Run tlsdesc1" \
diff --git a/ld/testsuite/lib/ld-lib.exp b/ld/testsuite/lib/ld-lib.exp
index b60fcad..aecc700 100644
--- a/ld/testsuite/lib/ld-lib.exp
+++ b/ld/testsuite/lib/ld-lib.exp
@@ -2210,3 +2210,67 @@ proc check_libdl_available { } {
     }
     return $libdl_available_saved
 }
+
+# Returns true if GNU2 TLS works.
+
+proc check_gnu2_tls_available { } {
+    global gnu2_tls_available_saved
+    global CC
+    global GNU2_CFLAGS
+
+    if {![info exists gnu2_tls_available_saved]} {
+        if { [which $CC] == 0 || "$GNU2_CFLAGS" == "" } {
+	    set gnu2_tls_available_saved 0
+	    return 0
+	}
+	# Check if GNU2 TLS works.
+	set flags "$GNU2_CFLAGS"
+	if [board_info [target_info name] exists cflags] {
+	    append flags " [board_info [target_info name] cflags]"
+	}
+	if [board_info [target_info name] exists ldflags] {
+	    append flags " [board_info [target_info name] ldflags]"
+	}
+
+	set basename "tmpdir/gnu2_tls[pid]"
+	set src1 ${basename}1.c
+	set output1 ${basename}.so
+	set f [open $src1 "w"]
+	puts $f "extern __thread int zzz;"
+	puts $f "int foo (void)"
+	puts $f "{"
+	puts $f "  return zzz;"
+	puts $f "}"
+	close $f
+	if [is_remote host] {
+	    set src1 [remote_download host $src1]
+	}
+	set src2 ${basename}2.c
+	set output2 ${basename}.exe
+	set f [open $src2 "w"]
+	puts $f "__thread int zzz = 20;"
+	puts $f "extern int foo (void);"
+	puts $f "int main (void)"
+	puts $f "{"
+	puts $f "  if (foo () != 20) __builtin_abort ();"
+	puts $f "  return 0; "
+	puts $f "}"
+	close $f
+	if [is_remote host] {
+	    set src2 [remote_download host $src2]
+	}
+	set gnu2_tls_available_saved [run_host_cmd_yesno "$CC" "-fPIC -shared $flags $src1 -o $output1"]
+	if { $gnu2_tls_available_saved == 1 } {
+	    set gnu2_tls_available_saved [run_host_cmd_yesno "$CC" "$flags $src2 $output1 -o $output2"]
+	    if { $gnu2_tls_available_saved == 1 } {
+		set gnu2_tls_available_saved [run_host_cmd_yesno "$output2" ""]
+	    }
+	}
+	remote_file host delete $src1
+	remote_file host delete $output1
+	remote_file host delete $src2
+	remote_file host delete $output2
+	file delete $src1 $src2
+    }
+    return $gnu2_tls_available_saved
+}