[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 #9 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to James Hilliard from comment #8)
> (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).

Our script builds only one toolchain with multilib enabled (which I think it is
not the case for buildroot).  In any case, for stage1 either
mips64el-glibc-linux-gnu or mipsel-glibc-linux-gnu works (since for mips64el
gcc still can generates -mabi=32 code).

> 
> >   --sysconfdir=/tmp/buildroot/output/host/etc \
> >   --localstatedir=/tmp/buildroot/output/host/var \
> >   --target=mipsel-buildroot-linux-gnu \
> 
> Setting target a second time?

I copy/paste from the stage1 config we use in your script and forget to remove
the mips64el one, using only mipsel-buildroot-linux-gnu should be suffice.

> 
> >  
> > --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?
> 

I did not actually patches the buildroot build system, but rather rebuild the
stage1 gcc at output/build/host-gcc-initial-11.3.0/build with the
configuration, issued make install and rebuild the glibc
(output/build/glibc-2.36-44-g2628500f5dff1dd99c49a09b418b3b1ea3a6b5d3/build).

It does show to work:

$ file elf/ld.so
elf/ld.so: ELF 32-bit LSB shared object, MIPS, MIPS32 rel2 version 1 (SYSV),
dynamically linked, with debug_info, not stripped
$ ./elf/ld.so --version
ld.so (Buildroot) stable release version 2.36.
Copyright (C) 2022 Free Software Foundation, Inc.
[...]
$ ./elf/ld.so ./libc.so
GNU C Library (Buildroot) stable release version 2.36.
[...]

At least qemu mips usermode can actually run the resulting loader.

> 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

I tried to hack the builroot system without much success, I also tried to mimic
what build-many-glibcs.py does, but I keep seeing the build failure.

However, if I rebuild the gcc with my hacked config:

./configure --prefix=/tmp/buildroot/output/host
--sysconfdir=/tmp/buildroot/output/host/etc
--localstatedir=/tmp/buildroot/output/host/var --disable-gtk-doc
--disable-gtk-doc-html --disable-doc --disable-docs --disable-documentation
--disable-debug --with-xmlto=no --with-fop=no --disable-nls
--disable-dependency-tracking --target=mipsel-buildroot-linux-gnu
--with-sysroot=/tmp/buildroot/output/host/mipsel-buildroot-linux-gnu/sysroot
--with-gnu-ld --disable-libssp --disable-multilib --disable-decimal-float
--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/
--without-zstd --disable-libquadmath --disable-libquadmath-support
--without-isl --without-cloog --with-arch=mips32r3 --with-abi=32
--with-nan=legacy --with-fp-32=xx --enable-languages=c --enable-initfini-array
--disable-libssp --disable-shared --without-headers --disable-threads
--disable-libatomic --disable-decimal-float --disable-libffi --disable-libgomp
--disable-libitm --disable-libmpx --disable-libquadmath --disable-libsanitizer
--with-newlib

on the buildroot directory, reinstall it, and the glibc does finish. That's why
I think there is something bogues on buildroot that I can't figure out.

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