crosstool and uClibc

[Dan Kegel]

Yann E. MORIN wrote:
> Hello!
> 
> I'm working on making an armv5b-xscale-linux-gnu uClibc-based toolchain with
> gcc-3.4.3. I based my work on the uClibc patch in contrib. The crtosstool
> version is something after 0.35, that is named 0.36, but isn't odfficialy
> released http://sources.redhat.com/ml/crossgcc/2005-05/msg00185.html

Grumble.  I'd forgotten about that one.  Guess I'm getting
soft in my head in my old age.  The next version of
crosstool better be 0.37, then.

> checking for library containing strerror... configure: error: Link tests are
> not allowed after GCC_NO_EXECUTABLES.
> make: *** [configure-target-libiberty] Error 1

This looks like
http://gcc.gnu.org/PR16838
but no solution is given there.

Jim Wilson explains the general problem a bit here:
http://gcc.gnu.org/ml/gcc/2003-10/msg01103.html
http://weongyo.org/compiler/jsboard/read.php?table=archive_gcc&no=99718

Basically, it's silly for libiberty to try to link a
program at this point, since you don't have a working
system library yet.

Whenever you run into a problem with an autoconf test,
have a look at the configure script and see if there's
an environment variable you can set to give it the
answer to the test so it doesn't have to run it.

In this case, I looked a bit, and the magic value might be
  ac_cv_search_strerror="none required"
  export ac_cv_search_strerror
Good luck.  Let us know what happens.
- Dan

p.s.
FWIW, here's where GCC_NO_EXECUTABLES was introduced:
http://sources.redhat.com/ml/binutils/2003-08/msg00419.html
It sets gcc_no_link to yes, and refuses to link programs,
if it thinks the linker's broken.

Gentoo ran into something similar in libstdc++:
http://bugs.gentoo.org/show_bug.cgi?id=55108
http://www.ldsys.net/~cgs/linux-mips/portage-20040916/sys-devel/gcc/files/3.4.1/gcc-3.4.1-glibc-is-native.patch
and worked around it by hacking libiberty's configure script to simply not
call GCC_NO_EXECUTABLES, since they knew it was wrong.


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