From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 build/autoconf/lto.m4 | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 build/autoconf/lto.m4

(limited to 'build/autoconf/lto.m4')

diff --git a/build/autoconf/lto.m4 b/build/autoconf/lto.m4
new file mode 100644
index 000000000..572a04b48
--- /dev/null
+++ b/build/autoconf/lto.m4
@@ -0,0 +1,19 @@
+dnl This Source Code Form is subject to the terms of the Mozilla Public
+dnl License, v. 2.0. If a copy of the MPL was not distributed with this
+dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+dnl check if the build is using lto. This is really primitive and only detects llvm based
+dnl compilers right now.
+AC_DEFUN([MOZ_DOING_LTO],
+[
+  cat > conftest.c <<EOF
+                  int foo = 1;
+EOF
+  $1=no
+  if ${CC-cc} ${CFLAGS} -S conftest.c -o conftest.s >/dev/null 2>&1; then
+    if grep '^target triple =' conftest.s; then
+      $1=yes
+    fi
+  fi
+  rm -f conftest.[cs]
+])
-- 
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