Set NOPIE_CFLAGS and NOPIE_LDFLAGS

GCC 6 can be configured to generate PIE by default.  But some linker
size tests expect non-PIE.  This patch defines NOPIE_CFLAGS to
"-fno-PIE" and NOPIE_LDFLAGS to "-no-pie" if target compiler supports
them.  Add $NOPIE_CFLAGS and $NOPIE_LDFLAGS to linker size tests if
needed.

	* config/default.exp (NOPIE_CFLAGS): New.
	(NOPIE_LDFLAGS): Likewise.
	* ld-size/size.exp (run_cc_link_tests): Add $NOPIE_CFLAGS and
	$NOPIE_LDFLAGS if needed.
	(run_ld_link_exec_tests): Add $NOPIE_CFLAGS if needed.

1 files changed, 39 insertions, 0 deletions

diff --git a/ld/testsuite/config/default.exp b/ld/testsuite/config/default.exp
index 5acc963..5b3e29f 100644
--- a/ld/testsuite/config/default.exp
+++ b/ld/testsuite/config/default.exp
@@ -313,3 +313,42 @@ if { ![info exists PLT_CFLAGS] } then {
 	set PLT_CFLAGS ""
     }
 }
+
+# Set NOPIE_CFLAGS to "-fno-PIE" and NOPIE_LDFLAGS to "-no-pie" if
+# target compiler supports them.
+
+if { ![info exists NOPIE_CFLAGS] || ![info exists NOPIE_LDFLAGS] } then {
+    if { [which $CC] != 0 } {
+	# Check if gcc supports -fno-PIE -no-pie.
+	set flags ""
+	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/nopie[pid]"
+	set src ${basename}.c
+	set output ${basename}
+	set f [open $src "w"]
+	puts $f "int main (void) { return 0; }"
+	close $f
+	remote_download host $src
+	set nopie_available [run_host_cmd_yesno "$CC" "$flags -fno-PIE -no-pie $src -o $output"]
+	remote_file host delete $src
+	remote_file host delete $output
+	file delete $src
+
+	if { $nopie_available == 1 } then {
+	    set NOPIE_CFLAGS "-fno-PIE"
+	    set NOPIE_LDFLAGS "-no-pie"
+	} else {
+	    set NOPIE_CFLAGS ""
+	    set NOPIE_LDFLAGS ""
+	}
+    } else {
+	set NOPIE_CFLAGS ""
+	set NOPIE_LDFLAGS ""
+    }
+}