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Re: [discuss] --with-sysroot required when building 32->64 bit crosstoolchain?(was: building a cross-compiler is hard)
Alan Modra wrote:
On Wed, Jan 07, 2004 at 08:06:15PM -0500, Raul Miller wrote:
On Wed, Jan 07, 2004 at 04:38:05PM -0800, Daniel Kegel wrote:
BTW, why do you build glibc twice?
I thought it was important at one point, but I forget why.
It's needed when bootstrapping glibc, ie. if you don't have a previous
libc and crt* files available. The trouble is that building a shared
glibc requires crt* to build, and the glibc build machinery isn't
clever enough to pick up newly built crt* files. Also, gcc's configure
makes use of AC_TRY_LINK, which again needs crt files. :-(
I haven't run into those problems, I think.
In http://kegel.com/crosstool, I do
* install glibc headers
* build bootstrap gcc
* build and install glibc
* build and install final gcc
and I happily get a shared glibc that passes the glibc regression tests.
I seem to recall that one reason people used to build glibc twice was to get the
paths right, but that's not really neccessary if you
override install_root when doing 'make install' in glibc.