From 954728e9df0ea4e1e79f9342d89e0fafc28f2cad Mon Sep 17 00:00:00 2001
From: Ben Walker <benjamin.walker@intel.com>
Date: Tue, 12 Feb 2019 12:45:01 -0700
Subject: [PATCH] build: Support PGO on clang.

Change-Id: I837c6c35c7ab34f5610d782647e333db2aff1f63
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/c/444279
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
---
 configure | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/configure b/configure
index dee62f580..bc506acd1 100755
--- a/configure
+++ b/configure
@@ -490,6 +490,13 @@ fi
 if [[ "${CONFIG[PGO_CAPTURE]}" = "y" && "${CONFIG[PGO_USE]}" = "y" ]]; then
 	echo "ERROR: --enable-pgo-capture and --enable-pgo-use are mutually exclusive."
 	exit 1
+elif [[ "${CONFIG[PGO_USE]}" = "y" ]]; then
+	CC_TYPE=$($rootdir/scripts/detect_cc.sh --cc=$CC --cxx=$CXX --lto=$CONFIG[LTO] --ld=$LD | grep "CC_TYPE" | cut -d "=" -f 2)
+	if [[ "$CC_TYPE" = "clang" ]]; then
+		# For clang we need to run an extra step on gathered profiling data.
+		echo "Generating suitable profile data"
+		llvm-profdata merge -output=build/pgo/default.profdata build/pgo
+	fi
 fi