c++11 std on g++4.7: gnu++11 vs c++11

esgol · 07-13-2012, 10:52 AM

In compiling concurent code from C++ 11 with g++ 4.7 [FINALLYY!!!

<3 <3 <3 ] Debian Sweezzy gives me option for the std compiler beetween gnu+11 or c++11

Is there a difference or are they the same?

Any example code from my C++ concurency book compiles teh same without hits, including example that had problems previously with 4.4, and even 4.6.4

ALSO

in previous versions (g++4.4) i had to include in the command after std
-lpthread

Quote:

For forum's SE optimization
To compile a C++ 11 code in linux with g++ 4.4.5 type
g++ -std=gnu++0x -lpthread code.cpp -o runfile

what was that lpthread? i can stil put it with no effect. compile the same

serafean · 07-13-2012, 02:36 PM

Hi, from man gcc :

Quote:

c++11
The 2011 ISO C++ standard plus amendments. Support for C++11 is still experimental, and may change in incompatible ways in future releases.

gnu++11
GNU dialect of -std=c++11. Support for C++11 is still experimental, and may change in incompatible ways in future releases.

gnu++11 might allow some gnuisms. c++11 won't.

-lpthread must be used if you use the pthread (POSIX threads) specification for threading. Knowing that C++11 supports synchronization primitives, and that you're looking at using it, for portability I'd use std::thread. I'll admit not knowing the status of these new features in their GNU implementation, so proceed with care.

Serafean

esgol · 07-14-2012, 02:56 AM

what are or could be gnuisms?

Nylex · 07-14-2012, 04:36 AM

See chapters 5 and 6 in the documentation (this link is for 4.7.1).