From: H.J. Lu <hjl.tools@gmail.com>
Date: Fri, 7 Dec 2012 17:56:09 +0000 (+0000)
Subject: Add check_lto_available
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3bd58fbe7576a68f9361978288457ab6e0912e3b;p=binutils-gdb.git

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 15fb59535a0..c957324d1b8 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+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
diff --git a/ld/testsuite/lib/ld-lib.exp b/ld/testsuite/lib/ld-lib.exp
index f08b9bf241c..5f49e74f9da 100644
--- 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 { } {