Re: how to get a prebuilt glibc

["William A. Gatliff" <bgat at billgatliff dot com>]

Have you tried the instructions here?

http://billgatliff.com/twiki/bin/view/Crossgcc/ToolSetup

I think you can see now why you want to avoid a prebuilt glibc if at
all possible.  I haven't built a powerpc-linux toolchain in a while,
but I don't recall needing a prebuilt glibc anywhere.  I'd be happy to
give it a go if you find the instructions in the wiki to not work for
you.

You need preconfigured KERNEL headers for the OS that you'll run on
the target (Linux, in this case).  Otherwise, gcc and glibc won't know
how to hook into the OS.  But that's not the same thing as a
preconfigured glibc.


b.g.

On Wed, Jul 31, 2002 at 06:16:45PM -0700, Xiaogeng (Shawn) Jin wrote:
> >>As Kai recommended in many messages in this list, a prebuilt glibc is
> >>necessary to build a bootstrap gcc before building a complete cross
> >>compiler. My target is powerpc-linux. Actually prebuilt glibc can be
> >>obtained from various sources, such as SuSE, YellowDog. But the problem
> >>is that these binary RPMs cannot be relocated. And I only have
> >>i686/RedHat hosts.
> 
> Well, after searching messages in the list one by one, I got part of the
> answer from this thread by Kai: 
> http://sources.redhat.com/ml/crossgcc/2002-04/msg00042.html.
> I decided to follow these steps to build the bootstrap gcc. 
> Unfortunately I still got some errors that I don't know how to solve.
> 
> --------------------clip---------------------------------
>   With gcc-2.95.3 one could simply copy the native Linux-headers from
> the '/usr/include' and copy the CPU-dependent headers from the
> 'sysdeps/*/powerpc/bits' and the 'sysdeps/*/powerpc/sys' in the glibc-
> sources into the '$prefix/$target/include/bits' and
> '$prefix/$target/include/sys' for the target and then get a working
> 'libgcc.a' at the first try and 'make all-gcc' to succeed...
> --------------------clip---------------------------------
> 
> First, I copied those native headers just from '/usr/include' not from 
> any subdirectories. Cause I thought some of them may conflict with those 
> from 'sysdefps/*/powerpc/...'. Am I right here?
> 
> Second, the cpu-dependent headers are copied as Kai said. But I'm not 
> quite sure about the meanings of '*'. Does it mean all of directories 
> that are under 'sysdeps/' and have subdirectory 'powerpc/'? In other 
> words, all headers from 'sysdeps/powperpc', 'sysdeps/unix/powerpc', 
> 'sysdeps/unix/sysv/linux/powerpc' are needed? I only copied headers from 
> 'sysdeps/unix/sysv/linux/powerpc'.
> 
> Third, I went to $build/gcc to 'make libgcc.a' and got complaint of no 
> libiberty.a found. Well, I jumped to $build/libiberty to 'make 
> libiberty.a' and succeeded. Frankly I don't know what function libiberty 
> is. Then went back to continue make process. Finally it complained this 
> error:
> -------------------------strip------------------------------------------
> In file included from /opt/xdev/ppc/8xx2/powerpc-linux/include/stdlib.h:25,
>                   from ../../gcc-2.95.3/gcc/libgcc2.c:41:
> /opt/xdev/ppc/8xx2/powerpc-linux/include/features.h:283: sys/cdefs.h: No 
> such file or directory
> /opt/xdev/ppc/8xx2/powerpc-linux/include/features.h:312: gnu/stubs.h: No 
> such file or directory
> In file included from ../../gcc-2.95.3/gcc/libgcc2.c:41:
> /opt/xdev/ppc/8xx2/powerpc-linux/include/stdlib.h:390: sys/types.h: No 
> such file or directory
> In file included from ../../gcc-2.95.3/gcc/libgcc2.c:42:
> /opt/xdev/ppc/8xx2/powerpc-linux/include/unistd.h:175: bits/posix_opt.h: 
> No such file or directory
> /opt/xdev/ppc/8xx2/powerpc-linux/include/unistd.h:190: bits/types.h: No 
> such file or directory
> In file included from ../../gcc-2.95.3/gcc/libgcc2.c:42:
> /opt/xdev/ppc/8xx2/powerpc-linux/include/unistd.h:500: bits/confname.h: 
> No such file or directory
> make: *** [libgcc2.a] Error 1
> -------------------------strip------------------------------------------
> 
> As Kai said, 'libgcc.a' should be compiled using the target headers. But 
> I cound't find these files in 'sysdeps/*': gnu/stubs.h, bits/confname.h, 
> sys/types.h. For bits/posix_opt.h in 'sysdeps/unix/sysv/linux/bits' and 
> 'sysdeps/generic/bits', bits/types.h in 'sysdeps/unix/sysv/linux/' and 
> in 'sysdeps/generic/bits', which one is the right choice?
> 
> ---------------------------clip------------------------------------
>   Ok, producing GCC uses only the build/host headers, but producing 
> 'libgcc.a', 'libiberty.a', 'libstdc++.a' etc. uses the target headers. 
> One cannot use mostly wrong headers for these...
> ---------------------------clip------------------------------------
> 
> Thank you.
> 
> - Shawn
> 
> 
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-- 
Bill Gatliff
bgat@billgatliff.com

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