From f4e7786786fff4267fe574b0fa0605477bd7eb85 Mon Sep 17 00:00:00 2001
From: Justin S <3630356+codeandkey@users.noreply.github.com>
Date: Wed, 5 Jun 2019 16:51:38 -0500
Subject: clang: fix error messages in c11_flag, cxx17_flag (#11632)

---
 lib/spack/spack/compilers/clang.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/spack/spack/compilers/clang.py b/lib/spack/spack/compilers/clang.py
index 658884b5de..352e842412 100644
--- a/lib/spack/spack/compilers/clang.py
+++ b/lib/spack/spack/compilers/clang.py
@@ -151,7 +151,7 @@ class Clang(Compiler):
                 raise UnsupportedCompilerFlag(self,
                                               "the C++17 standard",
                                               "cxx17_flag",
-                                              "< 5.0")
+                                              "< 3.5")
             elif self.version < ver('5.0'):
                 return "-std=c++1z"
             else:
@@ -167,7 +167,7 @@ class Clang(Compiler):
             raise UnsupportedCompilerFlag(self,
                                           "the C11 standard",
                                           "c11_flag",
-                                          "< 3.3")
+                                          "< 6.1.0")
         else:
             return "-std=c11"
 
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