From 54a78f41d24e597bfdfe074ade45bb2ce0c1d9f1 Mon Sep 17 00:00:00 2001
From: Michal Berger <michal.berger@intel.com>
Date: Fri, 7 Apr 2023 02:02:26 +0200
Subject: [PATCH] mk/spdk.common: Use -flto=auto for the LTO builds
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This tells lto-wrapper to either use make's jobserver or fallback to
auto guessing number of cpu threads used for the build. Mainly, this
should silence the following warning:

lto-wrapper: warning: using serial compilation of N LTRANS jobs
lto-wrapper: note: see the ‘-flto’ option documentation for more
information

Change-Id: Ib848319c858f4371b94f9264d22449535d25d6da
Signed-off-by: Michal Berger <michal.berger@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/17491
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
---
 mk/spdk.common.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mk/spdk.common.mk b/mk/spdk.common.mk
index fcc5f7d29..5c7d26fb6 100644
--- a/mk/spdk.common.mk
+++ b/mk/spdk.common.mk
@@ -97,8 +97,8 @@ COMMON_CFLAGS += -Werror
 endif
 
 ifeq ($(CONFIG_LTO),y)
-COMMON_CFLAGS += -flto
-LDFLAGS += -flto
+COMMON_CFLAGS += -flto=auto
+LDFLAGS += -flto=auto
 endif
 
 ifeq ($(CONFIG_PGO_CAPTURE),y)