On Wed, 3 May 2017, Joel Sherrill wrote:

> My conclusion is that INSTALL/prerequisites.html is wrong on two
> of the support libraries. Someone more knowledgeable will have
> to narrow down the real minimum. I am just reporting what builds.

The listed minima are for the scenario that you have a very old OS, or 
built the libraries some years ago, and want to know whether you need to 
update your OS or build new libraries.  If you are building the libraries 
at the same time as GCC, there is no reason to use old versions, and you 
should use current ones (and the download_prerequisites script should be 
updated whenever new versions are released upstream, at least when GCC's 
not in a release freeze).  The manual explicitly states "The in-tree build 
is only supported with the GMP version that download_prerequisites 
installs.", and likewise for MPFR and MPC.

-- 
Joseph S. Myers
jos...@codesourcery.com

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