From 8d00a11d518c329ff699505e9b98444abc485bbb Mon Sep 17 00:00:00 2001
From: Arnaud Giersch <arnaud.giersch@univ-fcomte.fr>
Date: Wed, 14 Mar 2018 22:50:59 +0100
Subject: [PATCH 1/1] Make icc honor parentheses (fix lmm_usage).

Without that, the expression in lagrange.cpp:405
    sigma_i = (sigma_i - cnst.lambda) + lambda;

seems to be evaluated in a different order, leading to an assertion failure.
---
 tools/cmake/GCCFlags.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/cmake/GCCFlags.cmake b/tools/cmake/GCCFlags.cmake
index b147dbfe9a..d9ae691b0f 100644
--- a/tools/cmake/GCCFlags.cmake
+++ b/tools/cmake/GCCFlags.cmake
@@ -84,6 +84,10 @@ if(enable_compile_optimizations AND CMAKE_COMPILER_IS_GNUCC
   # This is redundant (already in -03):
   set(optCFLAGS "${optCFLAGS} -finline-functions ")
 endif()
+if (CMAKE_C_COMPILER_ID MATCHES "Intel")
+  # honor parentheses when determining the order of expression evaluation.
+  set(optCFLAGS "${optCFLAGS} -fprotect-parens ")
+endif()
 
 # Do not leak the current directory into the binaries
 if(CMAKE_COMPILER_IS_GNUCC)
-- 
2.20.1