From: Matthias Maier <tamiko@43-1.org>
Date: Mon, 26 Dec 2016 11:42:03 +0000 (-0600)
Subject: CMake: Disable -Wundefined-var-template for clang
X-Git-Tag: v8.5.0-rc1~307^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=98b050eeebc7a34ba41eb77a13977120308eed14;p=dealii.git

CMake: Disable -Wundefined-var-template for clang

This warning leads to a lot of false positives. Simply disable the
diagnostic.

Fixes #3705
---

diff --git a/cmake/setup_compiler_flags_gnu.cmake b/cmake/setup_compiler_flags_gnu.cmake
index eec2173315..461c8107ee 100644
--- a/cmake/setup_compiler_flags_gnu.cmake
+++ b/cmake/setup_compiler_flags_gnu.cmake
@@ -110,6 +110,12 @@ IF(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   ENABLE_IF_SUPPORTED(DEAL_II_CXX_FLAGS "-Wno-variadic-macros")
   ENABLE_IF_SUPPORTED(DEAL_II_CXX_FLAGS "-Wno-c++11-extensions")
 
+  #
+  # Disable a diagnostic that warns about potentially uninstantiated static
+  # members. This leads to a ton of false positives.
+  #
+  ENABLE_IF_SUPPORTED(DEAL_II_CXX_FLAGS "-Wno-undefined-var-template")
+
   #
   # Clang versions prior to 3.6 emit a lot of false positives wrt
   # "-Wunused-function". Also suppress warnings for Xcode older than 6.3