Re: Link tests after GCC_NO_EXECUTABLES

[Jie Zhang <jzhang918 at gmail dot com>]

Bernd Schmidt wrote:
> 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.
But by design if gcc_no_link = no, link tests should be avoided.

Jie