Boost.Build does not build on GCC 4.4

[ned14]

The release notes for https://www.boost.org/users/history/version_1_72_0.html claim that Boost has been tested on GCC 4.4. This cannot be true, as Boost.Build does not build on GCC 4.4.

Please fix either the release notes (we actually only test earliest GCC 4.6) or Boost.Build.

[grafikrobot]

B2 needs a C++11 capable compiler to build the engine. But it is entirely usable with non-11 compilers outside of that. I.e. you can build Boost, or other projects, that are pre-11 after building b2 with an 11 compiler. As such only gcc 4.7 onward is supported for building b2 ATM. This requirement is mentioned in the B2 release notes: https://github.com/boostorg/build/releases/tag/4.0.0