Add check_lto_available

	* lib/ld-lib.exp (check_lto_available): New.  Check if compiler
	supports LTO.

diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index 15fb595..c957324 100644 (file)
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,5 +1,10 @@
 2012-12-07  H.J. Lu  <hongjiu.lu@intel.com>
 
+       * lib/ld-lib.exp (check_lto_available): New.  Check if compiler
+       supports LTO.
+
+2012-12-07  H.J. Lu  <hongjiu.lu@intel.com>
+
        * lib/ld-lib.exp (run_cc_link_tests): Properly check linker
        warnings.
 

diff --git a/ld/testsuite/lib/ld-lib.exp b/ld/testsuite/lib/ld-lib.exp
index f08b9bf..5f49e74 100644 (file)
--- a/ld/testsuite/lib/ld-lib.exp
+++ b/ld/testsuite/lib/ld-lib.exp
@@ -1614,6 +1614,34 @@ proc check_plugin_api_available { } {
     return $plugin_api_available_saved
 }
 
+# Returns true if the target compiler supports LTO
+proc check_lto_available { } {
+    global lto_available_saved
+    global CC
+    if {![info exists lto_available_saved]} {
+       # Check if gcc supports -flto -fuse-linker-plugin
+       if { [which $CC] == 0 } {
+           set lto_available_saved 0
+           return 0
+       }
+       set basename "lto"
+       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 "-shared -B[pwd]/tmpdir/ld/ -flto -fuse-linker-plugin $src -o $output"]
+       if { [lindex $status 0] == 0 } {
+           set lto_available_saved 1
+       } else {
+           set lto_available_saved 0
+       }
+       file delete $src
+       file delete $output
+    }
+    return $lto_available_saved
+}
+
 # Check if the assembler supports CFI statements.
 
 proc check_as_cfi { } {