[Buildroot] Buildroot fails to build when selecting build packages

[Nigel Sollars]

Hello,

Thanks for the feedback on Gcc, I removed it from my configuration and
rebuilt.

Again this is a copy of the config with only a make menuconfig , make
performed.  The original libglib2 issue reappeared.

ive supplied the config which is from version 2012.02 but ive also
confirmed this happens to me from git release also.

Regards
Nigel


On Sat, Apr 28, 2012 at 3:09 PM, Arnout Vandecappelle <arnout at mind.be>wrote:

> On Saturday 28 April 2012 18:01:42 Arnout Vandecappelle wrote:
> > > The new error is ( from the top error cause ):
> > >
> > > target/arm-unknown-linux-uclibcgnueabi/libstdc++-v3/include/cfenv:41:0,
> > >    from
> /usr/local/panda-stuff/buildroot-src/buildroot/output/toolchain/gcc-4.6.3/libstdc++-v3/include/precompiled/stdc++.h:54:
> > >
>  /usr/local/panda-stuff/buildroot-src/buildroot/output/build/gcc-4.6.3-target/arm-unknown-linux-uclibcgnueabi/libstdc++-v3/include/fenv.h:36:24:
> > > fatal error: fenv.h: No such file or directory
> > > compilation terminated.
> > [snip]
> >
> >  I can indeed reproduce this error.  However, after a second (clean) run
> > it did come through.  I suspect that this is a ccache problem.
>
>  Sorry, I spoke too soon...
>
>  I hadn't noticed that you're building gcc for the target.
>
>  It seems that there is something wrong with the configure of gcc.  It
> incorrectly thinks that fenv.h is available when compiling for the target.
>
> build/gcc-4.6.3-target/arm-unknown-linux-uclibcgnueabi/libstdc++-v3/include/arm-unknown-linux-uclibcgnueabi/bits/c++config.h:551:#define
> _GLIBCXX_HAVE_FENV_H 1
>
>  For the cross-compiler, it correctly identifies fenv.h being absent:
> toolchain/gcc-4.6.3-final/arm-unknown-linux-uclibcgnueabi/libstdc++-v3/include/arm-unknown-linux-uclibcgnueabi/bits/c++config.h:551:/*
> #undef _GLIBCXX_HAVE_FENV_H */
>
>  I guess this is the same problem as reported in
> https://bugs.busybox.net/show_bug.cgi?id=4484
>
>  The problem is that gcc installs fenv.h as part of libstdc++, even if no
> native fenv.h is available.  Therefore, the target libstdc++'s configure
> thinks that fenv.h is available.
>
>  The following patch (to buildroot) seems to solve it:
>
> ------
> diff --git a/toolchain/gcc/gcc-uclibc-4.x.mk b/toolchain/gcc/
> gcc-uclibc-4.x.mk
> index a2975dc..1600b68 100644
> --- a/toolchain/gcc/gcc-uclibc-4.x.mk
> +++ b/toolchain/gcc/gcc-uclibc-4.x.mk
> @@ -593,6 +593,7 @@ $(GCC_BUILD_DIR4)/.configured:
> $(GCC_BUILD_DIR4)/.prepared
>
>  $(GCC_BUILD_DIR4)/.compiled: $(GCC_BUILD_DIR4)/.configured
>        PATH=$(TARGET_PATH) \
> +       ac_cv_header_fenv_h=no \
>        $(MAKE) -C $(GCC_BUILD_DIR4) all
>        touch $@
>
> ------
>
>  But of course, it would be much better to find a patch that fixes
> the configure of libstdc++ and upstream it.
>
>  Regards,
>  Arnout
>
> --
> Arnout Vandecappelle                               arnout at mind be
> Senior Embedded Software Architect                 +32-16-286540
> Essensium/Mind                                     http://www.mind.be
> G.Geenslaan 9, 3001 Leuven, Belgium                BE 872 984 063 RPR
> Leuven
> LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
> GPG fingerprint:  7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F
>



-- 
“Science is a differential equation. Religion is a boundary condition.”

Alan Turing
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