GNU C++ how to check when -std=c++0x is in effect?
- by TerryP
My system compiler (gcc42) works fine with the TR1 features that I want, but trying to support newer compiler versions other than the systems, trying to accessing TR1 headers an #error demanding the -std=c++0x option because of how it interfaces with library or some hub bub like that.
/usr/local/lib/gcc45/include/c++/bits/c++0x_warning.h:31:2: error: #error This file requires compiler and library support for the upcoming ISO C++ standard, C++0x. This support is currently experimental, and must be enabled with the -std=c++0x or -std=gnu++0x compiler options.
Having to supply an extra switch is no problem, to support GCC 4.4 and 4.5 under this system (FreeBSD), but obviously it changes the picture!
Using my system compiler (g++ 4.2 default dialect):
#include <tr1/foo>
using std::tr1::foo;
Using newer (4.5) versions of the compiler with -std=c++0x:
#include <foo>
using std::foo;
Is there anyway using the pre processor, that I can tell if g++ is running with C++0x features enabled?
Something like this is what I'm looking for:
#ifdef __CXX0X_MODE__
#endif
but I have not found anything in the manual or off the web.
At this rate, I'm starting to think that life would just be easier, to use Boost as a dependency, and not worry about a new language standard arriving before TR4... hehe.
