[v39] Build fails with `undefined reference to ShashChess::WDLModel::is_initialized()'`

[bahmanm]

Describe the issue

What Happened

Super excited to try it out, I decided to build it on my laptop. Sadly it failed:

$ make COMP=gcc -j profile-build ARCH=x86-64-sse41-popcnt

Config:
debug: 'no'
sanitize: 'none'
optimize: 'yes'
arch: 'x86_64'
bits: '64'
kernel: 'Linux'
os: 'GNU/Linux'
prefetch: 'yes'
popcnt: 'yes'
pext: 'no'
sse: 'yes'
mmx: 'no'
sse2: 'yes'
ssse3: 'yes'
sse41: 'yes'
avx2: 'no'
avxvnni: 'no'
avx512: 'no'
vnni256: 'no'
vnni512: 'no'
altivec: 'no'
vsx: 'no'
neon: 'no'
dotprod: 'no'
arm_version: '0'
lsx: 'no'
lasx: 'no'
target_windows: ''

Flags:
CXX: g++
CXXFLAGS:  -Wall -Wextra -Wpedantic -Wcast-qual -fexceptions -std=c++17  -DUSE_LIVEBOOK -Wno-psabi -mprefer-vector-width=256 -mno-avx512f -pedantic -Wextra -Wshadow -Wmissing-declarations -m64 -DUSE_PTHREADS -DNDEBUG -O3 -funroll-loops -DIS_64BIT -msse -msse3 -mpopcnt -DUSE_POPCNT -DUSE_SSE41 -msse4.1 -DUSE_SSSE3 -mssse3 -DUSE_SSE2 -msse2 -DGIT_SHA=0289e374 -DGIT_DATE=20240504 -DARCH=x86-64-sse41-popcnt -flto -flto-partition=one
LDFLAGS:   -DUSE_LIVEBOOK -lcurl	 -m64 -Wl,--no-as-needed -lpthread  -Wall -Wextra -Wpedantic -Wcast-qual -fexceptions -std=c++17  -DUSE_LIVEBOOK -Wno-psabi -mprefer-vector-width=256 -mno-avx512f -pedantic -Wextra -Wshadow -Wmissing-declarations -m64 -DUSE_PTHREADS -DNDEBUG -O3 -funroll-loops -DIS_64BIT -msse -msse3 -mpopcnt -DUSE_POPCNT -DUSE_SSE41 -msse4.1 -DUSE_SSSE3 -mssse3 -DUSE_SSE2 -msse2 -DGIT_SHA=0289e374 -DGIT_DATE=20240504 -DARCH=x86-64-sse41-popcnt -flto -flto-partition=one -flto=jobserver

Testing config sanity. If this fails, try 'make help' ...


Step 1/4. Building instrumented executable ...
/usr/bin/make ARCH=x86-64-sse41-popcnt COMP=gcc gcc-profile-make

...

/usr/lib64/gcc/x86_64-suse-linux/15/../../../../x86_64-suse-linux/bin/ld: /tmp/ccZ6mcjN.ltrans0.ltrans.o: in function `ShashChess::Engine::search_clear()':
<artificial>:(.text+0x141d08): undefined reference to `ShashChess::WDLModel::is_initialized()'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:1113: shashchess] Error 1

My Machine

$ uname -a
Linux rostam 6.15.6-1-default #1 SMP PREEMPT_DYNAMIC Fri Jul 11 05:06:35 UTC 2025 (a69e09e) x86_64 x86_64 x86_64 GNU/Linux

$ g++ --version
g++ (SUSE Linux) 15.1.1 20250714

$ ld --version
GNU ld (GNU Binutils; openSUSE Tumbleweed) 2.43.1.20241209-9

$ zypper info coreutils | grep Version
Version        : 9.7-3.1

Expected behavior

The build should have succeeded and a binary should have been produced.

Steps to reproduce

• Download the source archive from v39 release page.
• Extract it
• cd src
• make COMP=gcc -j profile-build ARCH=x86-64-sse41-popcnt

Anything else?

No response

Operating system

Linux

ShashChess version

v39

[Chess321]

@bahmanm read: #70

[bahmanm]

@Chess321 Thanks. main builds all OK 🙌

@amchess I wonder if this qualifies for a new release - potentially just a patch release?