diff --git a/aclocal.m4 b/aclocal.m4
index 6a3100883865..a9f78c0c0618 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -14,7 +14,6 @@ builtin(include, build/autoconf/altoptions.m4)dnl
 builtin(include, build/autoconf/mozprog.m4)dnl
 builtin(include, build/autoconf/mozheader.m4)dnl
 builtin(include, build/autoconf/acwinpaths.m4)dnl
-builtin(include, build/autoconf/lto.m4)dnl
 
 MOZ_PROG_CHECKMSYS()
 
diff --git a/build/autoconf/lto.m4 b/build/autoconf/lto.m4
deleted file mode 100644
index d7a9802166a5..000000000000
--- a/build/autoconf/lto.m4
+++ /dev/null
@@ -1,15 +0,0 @@
-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
-      $1=yes
-    fi
-  fi
-  rm -f conftest.[cs]
-])
diff --git a/configure.in b/configure.in
index bff690ce86b7..53addfa082cb 100644
--- a/configure.in
+++ b/configure.in
@@ -1982,8 +1982,6 @@ fi
 AC_DEFINE_UNQUOTED(MOZILLA_VERSION,"$MOZILLA_VERSION")
 AC_DEFINE_UNQUOTED(MOZILLA_VERSION_U,$MOZILLA_VERSION)
 
-MOZ_DOING_LTO(lto_is_enabled)
-
 dnl ========================================================
 dnl System overrides of the defaults for target
 dnl ========================================================
@@ -2085,11 +2083,9 @@ case "$target" in
     # builds.
     MOZ_DEBUG_LDFLAGS="$MOZ_DEBUG_LDFLAGS -framework ExceptionHandling"
 
-    if test "x$lto_is_enabled" = "xyes"; then
-        echo "Skipping -dead_strip because lto is enabled."
     dnl DTrace and -dead_strip don't interact well. See bug 403132.
     dnl ===================================================================
-    elif test "x$enable_dtrace" = "xyes"; then
+    if test "x$enable_dtrace" = "xyes"; then
         echo "Skipping -dead_strip because DTrace is enabled. See bug 403132."
     else
         dnl check for the presence of the -dead_strip linker flag
diff --git a/js/src/build/autoconf/lto.m4 b/js/src/build/autoconf/lto.m4
deleted file mode 100644
index d7a9802166a5..000000000000
--- a/js/src/build/autoconf/lto.m4
+++ /dev/null
@@ -1,15 +0,0 @@
-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
-      $1=yes
-    fi
-  fi
-  rm -f conftest.[cs]
-])
diff --git a/js/src/configure.in b/js/src/configure.in
index b629bd454254..4df7a01365a3 100644
--- a/js/src/configure.in
+++ b/js/src/configure.in
@@ -1886,8 +1886,6 @@ if test "$_python_res" != 0; then
 fi
 AC_MSG_RESULT([yes])
 
-MOZ_DOING_LTO(lto_is_enabled)
-
 dnl ========================================================
 dnl System overrides of the defaults for target
 dnl ========================================================
@@ -1992,11 +1990,9 @@ case "$target" in
     # builds.
     MOZ_DEBUG_LDFLAGS="$MOZ_DEBUG_LDFLAGS -framework ExceptionHandling"
 
-    if test "x$lto_is_enabled" = "xyes"; then
-        echo "Skipping -dead_strip because lto is enabled."
     dnl DTrace and -dead_strip don't interact well. See bug 403132.
     dnl ===================================================================
-    elif test "x$enable_dtrace" = "xyes"; then
+    if test "x$enable_dtrace" = "xyes"; then
         echo "Skipping -dead_strip because DTrace is enabled. See bug 403132."
     else
         dnl check for the presence of the -dead_strip linker flag