Which version of glibc was used?

i686 glibc should reference pthread_cond_wait@@GLIBC_2.3.2, not
pthread_cond_wait@GLIBC_2.2.5.

glibc 2.35

It looks like WSIZE(64) is 1 for i686-linux-gnu.  Please show the output of

# echo __x86_64 | x86_64-linux-gnu-gcc -E -
# echo __x86_64 | x86_64-linux-gnu-gcc -m32 -E -

also aarch64-linux-gnu:

libtool: link: x86_64-linux-gnu-gcc -shared  -fPIC -DPIC  .libs/synctrace.o    -Wl,--version-script -W
l,../../../gprofng/libcollector/mapfile.aarch64-Linux -Wl,--no-as-needed -Wl,-lrt -Wl,-ldl -Wl,-z -Wl,
relro   -Wl,-soname -Wl,libgp-sync.so -o .libs/libgp-sync.so
/usr/bin/ld: .libs/libgp-sync.so: version node not found for symbol pthread_cond_wait@@GLIBC_2.3.2
/usr/bin/ld: failed to set dynamic section sizes: bad value
collect2: error: ld returned 1 exit status
make[6]: *** [Makefile:580: libgp-sync.la] Error 1

sorry, this is glibc 2.33, not 2.35.

$ echo __x86_64 | x86_64-linux-gnu-gcc -E -
# 0 "<stdin>"
# 0 "<built-in>"
# 0 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 0 "<command-line>" 2
# 1 "<stdin>"
1
$ echo __x86_64 | x86_64-linux-gnu-gcc -m32 -E -
# 0 "<stdin>"
# 0 "<built-in>"
# 0 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 0 "<command-line>" 2
# 1 "<stdin>"
__x86_64

Were you building x86-64 binutils on i686 Linux?

no, everything on x86_64-linux-gnu so far, the i686 and aarch64 builds are configured for these targets.

gprofng/libcollector/synctrace.c is written for target.  But synctrace.o
is linked against the host library.  It failed to link when host != target.

How do you configure your build ?

It looks like there are two bugs here:
1. libgp-sync.so may not link with libc.
 In run time, libgp-sync.so has to dlopen libc and use dlsym to find pthread_cond_wait.

2. it is probably a bug 29113 - Build error for x86_64-w64-mingw32 host since CLOCK_MONOTONIC does not exist

 The build was configured with --target=i686-linux-gnu.
Does this means that all binaries will be the 32-bit ?


I see that gprofng/libcollector/synctrace.c was built on x86_64 without -m32 option:
% file .libs/synctrace.o
.libs/synctrace.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), with debug_info, not stripped

 and synctrace.o is linked against the target (32-bit) library.

The master branch has been updated by Vladimir Mezentsev <vmezents@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=1653ae5b8440e2182ac86974b99b603bc15aa163

commit 1653ae5b8440e2182ac86974b99b603bc15aa163
Author: Vladimir Mezentsev <vladimir.mezentsev@oracle.com>
Date:   Thu May 5 00:08:19 2022 -0700

    gprofng: use $host instead $target
    
    By mistake, $target was used instead of $host to configure the gprogng build.
    
    gprofng/ChangeLog
    2022-04-28  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>
    
            PR gprofng/29113
            PR gprofng/29116
            * configure.ac: Use $host instead $target.
            * libcollector/configure.ac: Likewise.
            * configure: Rebuild.
            * libcollector/configure: Rebuild.

The master branch has been updated by Vladimir Mezentsev <vmezents@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=1bb1f55d648e9c32bbead00afc95761646a6d050

commit 1bb1f55d648e9c32bbead00afc95761646a6d050
Author: Vladimir Mezentsev <vladimir.mezentsev@oracle.com>
Date:   Wed Jul 6 13:52:57 2022 -0700

    gprofng: adjust GPROFNG_VARIANT
    
    GPROFNG_VARIANT depends on compiler options, not on $(host).
    
    gprofng/ChangeLog
    2022-07-06  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>
    
            PR gprofng/29116
            * libcollector/configure.ac: Adjust GPROFNG_VARIANT.
            * libcollector/configure: Rebuild.

Update status as resolved/fixed.