cmake: Use unset() instead of setting an empty string

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>

diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 687da7f9f4acbcab55951022e7c6cd12946cb1cd..f3e64d48e3ceaa38e4f677070bb079e1597dedd7 100644 (file)
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -42,7 +42,7 @@ if(CMAKE_COMPILER_IS_GNUCC AND NOT MINGW AND NOT OS2)
 "void __attribute__((visibility(\"default\"))) test() {}
 int main(void){ return 0; }
 " WITH_VISIBILITY_HIDDEN)
-        set(CMAKE_REQUIRED_FLAGS "")
+        unset(CMAKE_REQUIRED_FLAGS)
     endif (NOT GNUCC_VERSION EQUAL 34)
 endif(CMAKE_COMPILER_IS_GNUCC AND NOT MINGW AND NOT OS2)