From: Yann Collet <cyan@fb.com>
Date: Fri, 24 Dec 2021 01:43:12 +0000 (-0800)
Subject: library optimization flag can be selected on command line again
X-Git-Tag: v1.5.2^2~24
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75525fcb9f4c7ed1bb39d10aa43ce529c950d208;p=thirdparty%2Fzstd.git

library optimization flag can be selected on command line again

`CFLAGS=-O0 make`
will now use `-O0` instead of enforcing `-O3`
which used to be the behavior before introduction of `libzstd.mk`.

This should result in faster tests,
since a few tests depend on this capability for faster roundtrips.
---

diff --git a/lib/libzstd.mk b/lib/libzstd.mk
index af12daffe..c04957c6f 100644
--- a/lib/libzstd.mk
+++ b/lib/libzstd.mk
@@ -79,7 +79,7 @@ endif
   CFLAGS += -fno-stack-protector -fomit-frame-pointer -fno-ident \
             -DDYNAMIC_BMI2=0 -DNDEBUG
 else
-  CFLAGS += -O3
+  CFLAGS ?= -O3
 endif
 
 DEBUGLEVEL ?= 0