From: Sergei Trofimovich <slyfox@gentoo.org>
Date: Thu, 5 Mar 2020 23:52:26 +0000 (+0000)
Subject: toolchain.eclass: mangle -O3 down to -O2, not -O0
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=3bbf3bd432ec1436bef6e2d7ffc83d1c031553ab;p=gentoo.git

toolchain.eclass: mangle -O3 down to -O2, not -O0

In bug #701786 'strip-flags' removed all unsafe options
first including -O3 and only then mangled -O? to -O2.

This effectively made gcc to compalie wth -O0, generated
huge slow profile and confused LTO.

Let's default to safer -O3->-O2 transition.

Reported-by: jeff.lemos.a@gmail.com
Closes: https://bugs.gentoo.org/701786
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
---

diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index 62520ae92dff..d69ce9503eaa 100644
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -1494,8 +1494,8 @@ downgrade_arch_flags() {
 }
 
 gcc_do_filter_flags() {
+	replace-flags -O? -O2 # 701786 (-O3)
 	strip-flags
-	replace-flags -O? -O2
 
 	# dont want to funk ourselves
 	filter-flags '-mabi*' -m31 -m32 -m64