From 4e28dc6353f9705d71bb1aa1bc0ae84dd1d2610b Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Sun, 7 Jun 2020 00:05:02 +0200
Subject: [PATCH] Use only -O1 with AMD AOCC version of flang

to prevent miscompilation of LAPACK codes and tests on Ryzen
---
 Makefile.system | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/Makefile.system b/Makefile.system
index 547babaaa..252c816a9 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -783,6 +783,7 @@ endif
 
 ifeq ($(F_COMPILER), FLANG)
 CCOMMON_OPT += -DF_INTERFACE_FLANG
+FCOMMON_OPT += -frecursive
 ifdef BINARY64
 ifdef INTERFACE64
 ifneq ($(INTERFACE64), 0)
@@ -796,6 +797,11 @@ endif
 ifeq ($(USE_OPENMP), 1)
 FCOMMON_OPT += -fopenmp
 endif
+ifeq ($(OSNAME), Linux)
+ifeq ($(ARCH), x86_64)
+FLANG_VENDOR := $(shell expr `$(FC) --version|cut -f 1 -d "."|head -1`)
+endif
+endif
 endif
 
 ifeq ($(F_COMPILER), G77)
@@ -1270,8 +1276,11 @@ endif
 
 override CFLAGS     += $(COMMON_OPT) $(CCOMMON_OPT) -I$(TOPDIR)
 override PFLAGS     += $(COMMON_OPT) $(CCOMMON_OPT) -I$(TOPDIR) -DPROFILE $(COMMON_PROF)
-
+ifeq ($(FLANG_VENDOR),AOCC)
+override FFLAGS     += $(filter-out -O2 -O3,$(COMMON_OPT)) -O1 $(FCOMMON_OPT)
+else
 override FFLAGS     += $(COMMON_OPT) $(FCOMMON_OPT)
+endif
 override FPFLAGS    += $(FCOMMON_OPT) $(COMMON_PROF)
 #MAKEOVERRIDES =