[Bug libc/29621] librtld.os: in function `__register_frame': libgcc/unwind-dw2-fde.c:136: undefined reference to `malloc'

["james.hilliard1 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29621

--- Comment #8 from James Hilliard <james.hilliard1 at gmail dot com> ---
(In reply to Adhemerval Zanella from comment #7)
> (In reply to James Hilliard from comment #6)
> > 
> > Full commands:
> > git clone https://github.com/buildroot/buildroot.git
> > cd buildroot
> > git checkout e4ecf82f99f53e55d51e6f74ae5021473aa2bb1d
> > wget
> > http://autobuild.buildroot.net/results/883/
> > 883b171a856a63540908976592683527fdb21cd2/config
> > mv config .config
> > make glibc
> 
> Ok, with this one I can see the buildroot failure. It seems that it is
> misconfiguring the stage1 gcc, where the libgcc.a generated is relying on
> the libc for unwinding (thus why ld.so link is failing).
> 
> I mimic what build-many-glibcs.py [1] does (which is canonical way to build
> complete toolchain for glibc) and build a stage1 on buildroot system with:
> 
> ---
> ./configure \
>   --prefix=/tmp/buildroot/output/host \
>   --build=x86_64-pc-linux-gnu \
>   --host=x86_64-pc-linux-gnu \
>   --target=mips64el-glibc-linux-gnu \

This looks wrong, we aren't building for mips64el(which our autobuilders also
indicate does not have this particular build failure).

>   --sysconfdir=/tmp/buildroot/output/host/etc \
>   --localstatedir=/tmp/buildroot/output/host/var \
>   --target=mipsel-buildroot-linux-gnu \

Setting target a second time?

>  
> --with-sysroot=/tmp/buildroot/output/host/mipsel-buildroot-linux-gnu/sysroot
> \
>   --with-gmp=/tmp/buildroot/output/host \
>   --with-mpc=/tmp/buildroot/output/host \
>   --with-mpfr=/tmp/buildroot/output/host \
>   --with-pkgversion="Buildroot 2022.08-383-ge4ecf82f99-dirty" \
>   --with-bugurl=http://bugs.buildroot.net/ \
>   --enable-initfini-array \
>   --disable-libssp \
>   --disable-shared \
>   --disable-threads \
>   --disable-libatomic \
>   --disable-decimal-float \
>   --disable-libffi \
>   --disable-libgomp \
>   --disable-libitm \
>   --disable-libmpx \
>   --disable-libquadmath \
>   --disable-libsanitizer \
>   --without-headers\
>   --with-newlib \
>   --enable-languages=c, \
>   --with-arch=mips32r3 --with-abi=32 --with-nan=legacy --with-fp-32=xx
> ---

I've attempted to make a build using this configuration but have not been able
to get a working build.

> 
> And with this stage1 gcc I could finish the glibc build. I am afraid you
> will need to sort this out on buildroot stage1 configuration flags used on
> gcc.

I've tested by patching our gcc stage1
configure(package/gcc/gcc-initial/gcc-initial.mk).

Replacing HOST_GCC_INITIAL_CONF_OPTS with this for testing:
HOST_GCC_INITIAL_CONF_OPTS = \
        --build=x86_64-pc-linux-gnu \
        --host=x86_64-pc-linux-gnu \
        --target=$(GNU_TARGET_NAME) \
        --with-sysroot=$(STAGING_DIR) \
        --with-gmp=$(HOST_DIR) \
        --with-mpc=$(HOST_DIR) \
        --with-mpfr=$(HOST_DIR) \
        --with-pkgversion="Buildroot $(BR2_VERSION_FULL)" \
        --with-bugurl=http://bugs.buildroot.net/ \
        --enable-initfini-array \
        --disable-libssp \
        --disable-shared \
        --disable-threads \
        --disable-libatomic \
        --disable-decimal-float \
        --disable-libffi \
        --disable-libgomp \
        --disable-libitm \
        --disable-libmpx \
        --disable-libquadmath \
        --disable-libsanitizer \
        --without-headers \
        --with-newlib \
        --enable-languages=c, \
        --with-arch=mips32r3 --with-abi=32 --with-nan=legacy --with-fp-32=xx

With this I get the same failure as before. Does this successfully build for
you?

After patching gcc-initial.mk to test I do:
make clean
make glibc

> 
> [1]
> https://sourceware.org/git/?p=glibc.git;a=blob;f=scripts/build-many-glibcs.
> py;h=5af6f369ae04027911b3407c64716dd1571eae6a;hb=HEAD

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