How to tell scons to use the C++11 standard

Question

I don't manage to find how to tell scons to accept c++11 standard:

the SConstruct file:

env=Environment(CPPPATH='/usr/include/boost/',
                CPPDEFINES=[],
                LIBS=[],
                SCONS_CXX_STANDARD="c++11"
                )

env.Program('Hello', Glob('src/*.cpp'))

the cpp file:

#include <iostream>
class A{};
int main()
{
  std::cout << "hello world!" << std::endl;
  auto test = new A; // testing auto C++11 keyword
  if( test == nullptr ){std::cout << "hey hey" << std::endl;} // testing nullptr keyword
  else{std::cout << " the pointer is not null" << std::endl;}
  return 0;
};

error message when calling scons:

scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
g++ -o src/hello_world.o -c -I/usr/include/boost src/hello_world.cpp
src/hello_world.cpp: In function 'int main()':
src/hello_world.cpp:13:8: error: 'test' does not name a type
src/hello_world.cpp:15:7: error: 'test' was not declared in this scope
src/hello_world.cpp:15:15: error: 'nullptr' was not declared in this scope
scons: *** [src/hello_world.o] Error 1
scons: building terminated because of errors.

obviously it doesn't understand auto and nullptr

score 13 · Accepted Answer · edited May 23 '17 at 12:16

13

Im not sure if SCONS_CXX_STANDARD is supported yet in SCons.

Instead, if you're using GCC 4.7 or later, try passing -std=c++11 to the compiler as follows:

env=Environment(CPPPATH='/usr/include/boost/',
                CPPDEFINES=[],
                LIBS=[],
                CXXFLAGS="-std=c++0x"
                )

As explained in this question, you may need -gnu++11

edited May 23 '17 at 12:16

Community

1
1

answered Nov 01 '12 at 14:43

Brady

10,039
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yep thanx. It works fine, but I corrected your answer: the real g++ flag is -std=c++0x, not -std=c++11 – Stephane Rolland Nov 01 '12 at 14:48
Yes, scons is not compiler and dont support instruction like CXX_STANDART. It's just compiler flag. – Torsten Nov 01 '12 at 18:21
4

@StephaneRolland : That's only true through GCC 4.6.x – starting with GCC 4.7, it is indeed supposed to be `-std=c++11`. – ildjarn Nov 01 '12 at 19:42
2

This answer is incorrect now, current versions of SCons support `SCONS_CXX_STANDARD`. – mdd Mar 04 '19 at 16:52

How to tell scons to use the C++11 standard

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