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

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

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

--- Comment #7 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(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 \
  --sysconfdir=/tmp/buildroot/output/host/etc \
  --localstatedir=/tmp/buildroot/output/host/var \
  --target=mipsel-buildroot-linux-gnu \
  --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
---

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.

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

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