Re: Link tests after GCC_NO_EXECUTABLES

[Bernd Schmidt <bernds_cb1 at t-online dot de>]

Jie Zhang wrote:
> libstdc++ tries to avoid link tests when configured with newlib. But I
> saw this when working on bfin port gcc:
>
> checking whether -lc should be explicitly linked in... no
> checking dynamic linker characteristics... no
> checking how to hardcode library paths into programs... immediate
> checking for shl_load... configure: error: Link tests are not allowed 
> after GCC_NO_EXECUTABLES.
> make[1]: *** [configure-target-libstdc++-v3] Error 1
> make[1]: Leaving directory 
> `/home/jie/blackfin-sources/build43/gcc_build-4.3'
> make: *** [all] Error 2
>
> I got this when building bfin-elf-gcc with patched gcc and newlib in the
> same tree. I found LT_SYS_DLOPEN_SELF does link tests for shl_load after
> GCC_NO_EXECUTABLES. The call path is
>
> "libstdc++-v3/configure.ac" AM_PROG_LIBTOOL -> "libtool.m4" LT_INIT ->
> _LT_SETUP -> _LT_LANG_C_CONFIG -> LT_SYS_DLOPEN_SELF

I saw something similar, but managed to make it go away.  I don't 
remember how exactly (this kind of issue seems to happen to me all the 
time, for different reasons each time), but I think the actual problem 
was that you need to ensure that gcc_no_link doesn't get set.  That's a 
test somewhat earlier in configure.


Bernd
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