misc: only build with lto if explicitly enabled

Change the LTO default to off from probe because it wastes build time on
developer machines.  Anyone who really wants it for release builds or
whatever can still turn it on.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

diff --git a/configure.ac b/configure.ac
index 2448416caaa50d37801ee78a9bc5838c09253dc0..38e5426a3a92a82906c28c41ae8b43dd1cdf86d7 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -91,8 +91,8 @@ AC_ARG_ENABLE(threadsan,
 AC_SUBST(enable_threadsan)
 
 AC_ARG_ENABLE(lto,
-[ --enable-lto=[yes/no]      Enable link time optimization (LTO) [default=probe]],,
-       enable_lto=probe)
+[ --enable-lto=[yes/no]      Enable link time optimization (LTO) [default=no]],,
+       enable_lto=no)
 AC_SUBST(enable_lto)
 
 # Enable xfs_scrub build