Re: compiling gcc 5.x from the scratch: issues

[Markus Trippelsdorf <markus@trippelsdorf.de>]

On 2015.09.10 at 19:53 +0100, Jonathan Wakely wrote:
> On 10 September 2015 at 17:23, Martin Sebor wrote:
> > FWIW, I think the more common source of problems for those new
> > to building GCC is not having all the right prerequisites. The
> > GCC configure script tries to detect whether the right versions
> > are available but does only a superficial job (checks their
> > version macros) which can lead to cryptic build failures down
> > the line when not all the right architectures are installed
> > (e.g., the i686 in addition to x86_64). It also proceeds when
> > MPC is not installed at all which then causes the build to fail.
> 
> Not having the right prerequisites certainly used to be a common
> problem (not quite as common as having them but installing them
> outside ld.so's search dirs and then not setting LD_LIBRARY_PATH).
> However, since I've been on a crusade to stop people doing that by
> pointing them at https://gcc.gnu.org/wiki/InstallingGCC and telling
> them to use contrib/download_prerequisites it is *much* less common
> than it used to be.
> 
> Markus, I think your patch wouldn't hurt, and might help people who
> fail to read the instructions carefully, so I suggest sending it to
> gcc-patches for review.

I did that already and Jeff has approved the patch. Will commit it
tomorrow.

-- 
Markus