From 80c4e7281eee1ed22a1482cf947a2074c99e6ed0 Mon Sep 17 00:00:00 2001
From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Date: Fri, 10 Jun 2016 17:09:32 +0200
Subject: [PATCH] net/mlx: regenerate autoconf file automatically

Mellanox PMDs must be rebuilt if a Verbs update would cause the autoconf
file to differ.

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 drivers/net/mlx4/Makefile | 13 +++++++++++--
 drivers/net/mlx5/Makefile | 13 +++++++++++--
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/net/mlx4/Makefile b/drivers/net/mlx4/Makefile
index 4d163433b5..efed953e73 100644
--- a/drivers/net/mlx4/Makefile
+++ b/drivers/net/mlx4/Makefile
@@ -100,7 +100,9 @@ ifndef V
 AUTOCONF_OUTPUT := >/dev/null
 endif
 
-mlx4_autoconf.h: $(RTE_SDK)/scripts/auto-config-h.sh
+mlx4_autoconf.h.new: FORCE
+
+mlx4_autoconf.h.new: $(RTE_SDK)/scripts/auto-config-h.sh
 	$Q $(RM) -f -- '$@'
 	$Q sh -- '$<' '$@' \
 		RSS_SUPPORT \
@@ -120,9 +122,16 @@ mlx4_autoconf.h: $(RTE_SDK)/scripts/auto-config-h.sh
 		enum IBV_EXP_QP_BURST_CREATE_DISABLE_ETH_LOOPBACK \
 		$(AUTOCONF_OUTPUT)
 
+# Create mlx4_autoconf.h or update it in case it differs from the new one.
+
+mlx4_autoconf.h: mlx4_autoconf.h.new
+	$Q [ -f '$@' ] && \
+		cmp '$<' '$@' $(AUTOCONF_OUTPUT) || \
+		mv '$<' '$@'
+
 mlx4.o: mlx4_autoconf.h
 
 clean_mlx4: FORCE
-	$Q rm -f -- mlx4_autoconf.h
+	$Q rm -f -- mlx4_autoconf.h mlx4_autoconf.h.new
 
 clean: clean_mlx4
diff --git a/drivers/net/mlx5/Makefile b/drivers/net/mlx5/Makefile
index a08515b97f..82558aab11 100644
--- a/drivers/net/mlx5/Makefile
+++ b/drivers/net/mlx5/Makefile
@@ -108,7 +108,9 @@ ifndef V
 AUTOCONF_OUTPUT := >/dev/null
 endif
 
-mlx5_autoconf.h: $(RTE_SDK)/scripts/auto-config-h.sh
+mlx5_autoconf.h.new: FORCE
+
+mlx5_autoconf.h.new: $(RTE_SDK)/scripts/auto-config-h.sh
 	$Q $(RM) -f -- '$@'
 	$Q sh -- '$<' '$@' \
 		HAVE_EXP_QUERY_DEVICE \
@@ -149,9 +151,16 @@ mlx5_autoconf.h: $(RTE_SDK)/scripts/auto-config-h.sh
 		enum IBV_EXP_RECEIVE_WQ_CVLAN_INSERTION \
 		$(AUTOCONF_OUTPUT)
 
+# Create mlx5_autoconf.h or update it in case it differs from the new one.
+
+mlx5_autoconf.h: mlx5_autoconf.h.new
+	$Q [ -f '$@' ] && \
+		cmp '$<' '$@' $(AUTOCONF_OUTPUT) || \
+		mv '$<' '$@'
+
 $(SRCS-$(CONFIG_RTE_LIBRTE_MLX5_PMD):.c=.o): mlx5_autoconf.h
 
 clean_mlx5: FORCE
-	$Q rm -f -- mlx5_autoconf.h
+	$Q rm -f -- mlx5_autoconf.h mlx5_autoconf.h.new
 
 clean: clean_mlx5
-- 
2.20.1