Add and use check_lto_shared_available

2014-01-09  Vidya Praveen  <vidyapraveen@arm.com>

	* lib/ld-lib.exp (check_lto_shared_available): New check.
	* ld-plugin/lto.exp: Use check_lto_shared_available.

1 files changed, 39 insertions, 0 deletions

diff --git a/ld/testsuite/lib/ld-lib.exp b/ld/testsuite/lib/ld-lib.exp
index c04b56f..54b617f 100644
--- a/ld/testsuite/lib/ld-lib.exp
+++ b/ld/testsuite/lib/ld-lib.exp
@@ -1679,6 +1679,45 @@ proc check_lto_available { } {
     return $lto_available_saved
 }
 
+# Returns true if the target compiler supports LTO and -shared
+proc check_lto_shared_available { } {
+    global lto_shared_available_saved
+    global CC
+
+    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]"
+    }
+
+    if {![info exists lto_shared_available_saved]} {
+	# Check if gcc supports -flto -fuse-linker-plugin -shared
+	if { [which $CC] == 0 } {
+	    set lto_shared_available_saved 0
+	    return 0
+	}
+	set basename "lto_shared"
+	set src ${basename}[pid].c
+	set output ${basename}[pid].so
+	set f [open $src "w"]
+	puts $f ""
+	close $f
+	set status [remote_exec host $CC "$flags -shared -fPIC -B[pwd]/tmpdir/ld/ -flto -fuse-linker-plugin $src -o $output"]
+	if { [lindex $status 0] == 0 } {
+	    set lto_shared_available_saved 1
+	} else {
+	    set lto_shared_available_saved 0
+	}
+	file delete $src
+	file delete $output
+    }
+    return $lto_shared_available_saved
+}
+
 # Check if the assembler supports CFI statements.
 
 proc check_as_cfi { } {