Re: 23/33: gnu: commencement: gcc-boot0: Build fix for the Hurd.

[Efraim Flashner]

On Tue, Mar 10, 2020 at 10:13:37AM +0100, Ludovic Courtès wrote:
> address@hidden skribis:
> 
> > commit 7a57ca758c590742b63100944f07fddb7290f797
> > Author: Jan Nieuwenhuizen <address@hidden>
> > AuthorDate: Sun Mar 1 13:45:42 2020 +0100
> >
> >     gnu: commencement: gcc-boot0: Build fix for the Hurd.
> >     
> >     Fixes:
> >         g++   -g -O2 -DIN_GCC  -DCROSS_DIRECTORY_STRUCTURE   
> > -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall 
> > -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute 
> > -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros 
> > -Wno-overlength-strings   -DHAVE_CONFIG_H -DGENERATOR_FILE -fno-PIE 
> > -static-libstdc++ -static-libgcc 
> > -Wl,-rpath=/gnu/store/vp2id82a597p119b3wyhhkhd467wvn78-glibc-bootstrap-0/lib
> >  -Wl,-dynamic-linker -Wl,/gnu/store/vp2id82a597p119b3w [...]
> >             build/genmddeps.o build/read-md.o build/errors.o 
> > ../build-i586-unknown-gnu/libiberty/libiberty.a
> >         
> > /gnu/store/jk3kx5jwjs9m60svzk6sz79bf0w33l91-binutils-cross-boot0-2.34/bin/ld:
> >  build/read-md.o: in function `md_reader::~md_reader()':
> >         
> > /tmp/guix-build-gcc-cross-boot0-7.5.0.drv-0/build/gcc/../../gcc-7.5.0/gcc/read-md.c:1049:
> >  undefined reference to `operator delete(void*, unsigned int)'
> >     
> >     This raises the question: Should libstdc++-boot0 (v4.9) be sufficient 
> > to build
> >     gcc-boot0 (v7.5.0)?
> 
> Hmm?  :-)
> 
> >     * gnu/packages/commencement.scm (gcc-boot0): Add static library path.
> 
> >                 `(,(string-append "LDFLAGS="
> > +                                 (if ,(hurd-system?)
> > +                                     (string-append
> > +                                      "-L" (assoc-ref %build-inputs "gcc") 
> > "/lib ")
> > +                                     "")
> 
> Could you add a comment saying that this is to allow the ‘delete’
> operator to be found?  Weird.
> 
> That’s it, thanks for the great work!
> 
> Ludo’.
> 

With the bootstrapping efforts going around there's a couple of patches
floating around to change the gcc version for libstdc++-boot0. I've
tested the following patch, which also prepares the way for any other
future supported platforms.

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0001-gnu-libstdc-boot0-Use-per-architecture-gcc-versions.patch
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