[Bug bootstrap/87858] Building old multilib bootstrap GCC: stage1 32-bit libstdc++ fails to build after building 64-bit libstdc++

["edgargar at unam dot mx" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87858

Ed Gar <edgargar at unam dot mx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |edgargar at unam dot mx

--- Comment #9 from Ed Gar <edgargar at unam dot mx> ---
I confirm that the issue persists even when using either patch suggested by
Matthew Krupcale. I am tried to compile gcc 8.2.0 using gcc 11.3.1 on Fedora 34
following the command:

cd gcc-8.2.0
contrib/download_prerequisites
patch -b < makefile.patch
cd ../build-gcc-82
../gcc-8.2.0/configure --prefix=/usr/local/gcc82 --program-suffix=82
--enable-languages=c,c++,fortran --disable-multilib --disable-libstdcxx-pch
--with-system-zlib
make

where makefile.patch is either of the proposed patches. After a while the
building process produces the following error:

make[5]: Entering directory '/root/build-gcc-8.2/x86_64-pc-linux-gnu/libgomp'
makeinfo --split-size=5000000 --split-size=5000000 --split-size=5000000  -I
../../../gcc-8.2.0/libgomp/../gcc/doc/include -I ../../../gcc-8.2.0/libgomp -o
libgomp.info ../../../gcc-8.2.0/libgomp/libgomp.texi
/bin/sh ./libtool --tag=CC   --mode=compile /root/build-gcc-8.2/./gcc/xgcc
-B/root/build-gcc-8.2/./gcc/ -B/usr/local/gcc82/x86_64-pc-linux-gnu/bin/
-B/usr/local/gcc82/x86_64-pc-linux-gnu/lib/ -isystem
/usr/local/gcc82/x86_64-pc-linux-gnu/include -isystem
/usr/local/gcc82/x86_64-pc-linux-gnu/sys-include    -DHAVE_CONFIG_H -I.
-I../../../gcc-8.2.0/libgomp  -I../../../gcc-8.2.0/libgomp/config/linux/x86
-I../../../gcc-8.2.0/libgomp/config/linux
-I../../../gcc-8.2.0/libgomp/config/posix -I../../../gcc-8.2.0/libgomp
-I../../../gcc-8.2.0/libgomp/../include  -Wall -Werror -ftls-model=initial-exec
-Wc,-pthread  -g -O2 -MT alloc.lo -MD -MP -MF .deps/alloc.Tpo -c -o alloc.lo
../../../gcc-8.2.0/libgomp/alloc.c
libtool: compile:  /root/build-gcc-8.2/./gcc/xgcc -B/root/build-gcc-8.2/./gcc/
-B/usr/local/gcc82/x86_64-pc-linux-gnu/bin/
-B/usr/local/gcc82/x86_64-pc-linux-gnu/lib/ -isystem
/usr/local/gcc82/x86_64-pc-linux-gnu/include -isystem
/usr/local/gcc82/x86_64-pc-linux-gnu/sys-include -DHAVE_CONFIG_H -I.
-I../../../gcc-8.2.0/libgomp -I../../../gcc-8.2.0/libgomp/config/linux/x86
-I../../../gcc-8.2.0/libgomp/config/linux
-I../../../gcc-8.2.0/libgomp/config/posix -I../../../gcc-8.2.0/libgomp
-I../../../gcc-8.2.0/libgomp/../include -Wall -Werror -pthread
-ftls-model=initial-exec -g -O2 -MT alloc.lo -MD -MP -MF .deps/alloc.Tpo -c
../../../gcc-8.2.0/libgomp/alloc.c  -fPIC -DPIC -o .libs/alloc.o
/root/build-gcc-8.2/./gcc/cc1:
/root/build-gcc-8.2/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6:
version `GLIBCXX_3.4.29' not found (required by /root/build-gcc-8.2/./gcc/cc1)