sycl: compilation fails with std::future_error: Future already retrieved

[LAKostis]

Greetings!

I'm having strange issue when compiling oidn sycl: it fails during ocloc invocation with error. Only oidn is affected, other apps using sycl (blender for example) compile just fine:

[ 77%] Building CXX object devices/sycl/CMakeFiles/OpenImageDenoise_device_sycl.dir/sycl_conv_xelp.cpp.o
cd /usr/src/RPM/BUILD/oidn-2.3.3/x86_64-alt-linux/devices/sycl && /usr/lib/llvm-dpcpp/bin/clang++ -DOIDN_DEVICE_SYCL_AOT -DOIDN_DEVICE_SYCL_JIT_CACHE -DOpenImageDenoise_device_sycl_EXPORTS -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -I/usr/src/RPM/BUILD/oidn-2.3.3 -I/usr/src/RP
M/BUILD/oidn-2.3.3/external -I/usr/src/RPM/BUILD/oidn-2.3.3/x86_64-alt-linux -pipe -frecord-gcc-switches -Wall -g -O2  -Wall -Wno-unknown-pragmas -Wno-pass-failed -Wno-unneeded-internal-declaration -fPIC -Wformat -Wformat-security  -O2 -g -DNDEBUG  -fstack-protector -U_FORTIFY_SOU
RCE -D_FORTIFY_SOURCE=2 -std=c++17 -fPIC -fvisibility=internal -fvisibility-inlines-hidden -fsycl -Wno-deprecated-declarations -fsycl-max-parallel-link-jobs=1 -fsycl-targets=spir64_gen -fno-sycl-rdc -Xsycl-target-backend=spir64_gen "-device tgllp,rkl,adl-s,adl-p,adl-n,dg1,mtl-u,mt
l-h,pvc-vg --format zebin" -MD -MT devices/sycl/CMakeFiles/OpenImageDenoise_device_sycl.dir/sycl_conv_xelp.cpp.o -MF CMakeFiles/OpenImageDenoise_device_sycl.dir/sycl_conv_xelp.cpp.o.d -o CMakeFiles/OpenImageDenoise_device_sycl.dir/sycl_conv_xelp.cpp.o -c /usr/src/RPM/BUILD/oidn-2.
3.3/devices/sycl/sycl_conv_xelp.cpp
terminate called after throwing an instance of 'std::future_error'
  what():  std::future_error: Future already retrieved
llvm-foreach: Aborted
clang++: error: gen compiler command failed with exit code 254 (use -v to see invocation)
ALT Linux Team clang version 21.0.0dpcpp
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-dpcpp/bin
Build config: +assertions
clang++: note: diagnostic msg: Error generating preprocessed source(s).
gmake[2]: *** [devices/sycl/CMakeFiles/OpenImageDenoise_device_sycl.dir/build.make:163: devices/sycl/CMakeFiles/OpenImageDenoise_device_sycl.dir/sycl_conv_xelp.cpp.o] Error 1
gmake[2]: Leaving directory '/usr/src/RPM/BUILD/oidn-2.3.3/x86_64-alt-linux'
gmake[1]: *** [CMakeFiles/Makefile2:505: devices/sycl/CMakeFiles/OpenImageDenoise_device_sycl.dir/all] Error 2
gmake[1]: *** Waiting for unfinished jobs....

Toolchain details:
oidn version: 2.3.3
libze 1.23.2
ocloc 25.31.34666.3
igc: 2.16.0
DPC++ 6.2.0

oidn flags used for sycl enablement:

        -DOIDN_DEVICE_SYCL:BOOL=ON \
        -DCMAKE_C_COMPILER=%prefix/lib/llvm-dpcpp/bin/clang \
        -DCMAKE_CXX_COMPILER=%prefix/lib/llvm-dpcpp/bin/clang++ \

Detailed compile log attached.

compile.log