From c93ed1c9eb01027aee04f567b7541738b2aa8bda Mon Sep 17 00:00:00 2001
From: Josh Blum
Date: Thu, 30 Aug 2012 16:57:35 -0700
Subject: volk: dont set CMAKE_REQUIRED_FLAGS when empty

---
 volk/lib/CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'volk')

diff --git a/volk/lib/CMakeLists.txt b/volk/lib/CMakeLists.txt
index 2ba1bf8fd..328a4e087 100644
--- a/volk/lib/CMakeLists.txt
+++ b/volk/lib/CMakeLists.txt
@@ -93,7 +93,9 @@ macro(check_arch arch_name)
             COMMAND ${PYTHON_EXECUTABLE} -c "import re; print(re.sub('\\W', '_', '${have_flag}'))"
             OUTPUT_VARIABLE have_flag OUTPUT_STRIP_TRAILING_WHITESPACE
         )
-        set(CMAKE_REQUIRED_FLAGS VOLK_FLAG_CHECK_FLAGS)
+        if(VOLK_FLAG_CHECK_FLAGS)
+            set(CMAKE_REQUIRED_FLAGS VOLK_FLAG_CHECK_FLAGS)
+        endif()
         CHECK_CXX_COMPILER_FLAG(${flag} ${have_flag})
         unset(CMAKE_REQUIRED_FLAGS)
         if (NOT ${have_flag})
-- 
cgit