From 6e99de6d3c91037b207443e89b148c75e8340197 Mon Sep 17 00:00:00 2001
From: Andrew Kryczka <andrewkr@fb.com>
Date: Mon, 10 Aug 2020 11:23:48 -0700
Subject: [PATCH] Allow optimization level to be set in Makefile (#7202)

Summary:
`-O3` is already adopted widely, so we should make it easier to configure
for development/open source. This PR adds an `OPTIMIZE_LEVEL` variable
that users can set to override the `-O` flag chosen in the Makefile.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7202

Test Plan: built a few different ways and verified correct value is passed for `-O` flag

Reviewed By: pdillinger

Differential Revision: D22845291

Pulled By: ajkr

fbshipit-source-id: 84471362e7d627dd606b25bf5f6a3d796817fa1c
---
 Makefile | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 6177c136c..05f73a54d 100644
--- a/Makefile
+++ b/Makefile
@@ -131,11 +131,14 @@ endif
 # Figure out optimize level.
 ifneq ($(DEBUG_LEVEL), 2)
 ifeq ($(LITE), 0)
-	OPT += -O2
+	OPTIMIZE_LEVEL ?= -O2
 else
-	OPT += -Os
+	OPTIMIZE_LEVEL ?= -Os
 endif
 endif
+# `OPTIMIZE_LEVEL` is empty when the user does not set it and `DEBUG_LEVEL=2`.
+# In that case, the compiler default (`-O0` for gcc and clang) will be used.
+OPT += $(OPTIMIZE_LEVEL)
 
 # compile with -O2 if debug level is not 2
 ifneq ($(DEBUG_LEVEL), 2)