build: force a c++ standard to be specified

Newer compilers may switch to newer standards by default. For example, gcc6 uses std=gnu++14 by default.
2017-12-01 14:10:17 +00:00
parent 0bcd85bee8
commit 943f19fec7
2 changed files with 8 additions and 2 deletions
@@ -56,7 +56,7 @@ case $host in
  ;;
 esac
 dnl Require C++11 compiler (no GNU extensions)
-AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory])
+AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory], [nodefault])
 dnl Check if -latomic is required for <std::atomic>
 CHECK_ATOMIC