On 13 April 2017 at 16:24, Toebs Douglass wrote: > Hi, all. > > I have two questions. > > As you probably remember, I'm working to build all released versions of > GCC, starting with 4.1.2, on four different platforms (arm, aarch64, > mipsel, x86_64). > > I am now working to find out which version of libmpfr, libgmp and libmpc > are needed for each version of GCC. > > Prior to replies from my earlier questions to this list, I had assumed > the latest versions available at the time of a GCC release would be > used, but this is not the case; GCC only changes version where there's a > good reason to do so. > > This means however I can no longer use release dates to know which > versions of the dependency libraries are used by any given version of GCC. > > Starting with GC 4.6.0, there is a contrib script, > "download_prerequisites", which indictes the recommended version of > these libraries. So for GCC 4.6.0 and later, I have the information I need. > > For earlier versions though, things seem not so easy or clear. > > What I see in general with GCC is that there is fact a *minimum* version > of these libraries, and a *recommended* version, which is normally only > a slightly higher version, but still, is different. > > I want to use the recommended version. > > I can by looking in the configure script go back to and including 4.5.0 > and make a pretty solid guess at the recommended versions (you can see > the script treating minimum and recommended versions differently) - but > before that, the build system changes and again, it's not so clear. > > Perhaps prior to that point there is only a minimum version, and no > recommended version? > > So the first question is : does anyone have anything useful they could > tell me about finding out this information? which is to say, > recommended dependency versions for GCC 4.4.7 and earlier, back to and > including 4.1.2. The prerequisites for a release are documented in gcc/doc/install.texi in the sources of that release. > Currently I'm looking at the build files, and I can make a guess, but I > can't really tell if I'm finding the *minimum* version rather than > *recommended* version. So I can get *a* version - but it may not be the > version I'm looking for. > > My second question has to do with Graphite loop optimizations. > > These were folded into the main branch with version 4.8.0, I think it was. > > Prior to this, back to version 4.5.0 (I think) they depended on libmpc, > and from 4.4.7 and further back (to when they were introduced - I don't > yet know when this was), they depended on libppl and cloog-ppl (and > libmpc was then not a dependency). > > My second question is whether or not people have any idea if graphite > was typically compiled in (it's optional) prior to 4.8.0? I get the > impression it could have been a bit buggy/experimental prior to that > point, and so was perhaps not normally used. It is still not widely used today. Graphite optimisations are very unlikely to make any difference for your code. I wouldn't bother with Graphite if I were you.
