Static library linkage failure with enabled IPO on ICX

[fatvlad1744]

Hi,

I'm trying to have two-stage compilation where I create static library first and link it afterwards.

// main.cpp
void foo();

int main() {
    foo();
}

// foo.cpp
#include <iostream>

void foo() {
    std::cout << "Hi foo!" << std::endl;
}

Compilation:

$ icpx -fast -c -o foo.o foo.cpp
$ xiar rcs libfoo.a foo.o
xiar: executing 'ar'
$ icpx -fast main.cpp -L. -lfoo
/usr/bin/ld: skipping incompatible ./libfoo.a when searching for -lfoo
/usr/bin/ld: cannot find -lfoo
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

Seems like it fails to parse static library format when IPO is enabled. When IPO is disabled, everything is fine. Also, classic ICC compiler works fine.

However, when using direct linkage with object file, everything seems to work fine.

Can you please clarify how to fix that? I'm using CentOS 7.

Thanks in advance.

[fatvlad1744]

Verbose compiler output:

$ icpx -fast -c -o foo.o foo.cpp
$ xiar rcs libfoo.a foo.o
xiar: executing 'ar'
$ icpx -fast main.cpp -L. -lfoo
/usr/bin/ld: skipping incompatible ./libfoo.a when searching for -lfoo
/usr/bin/ld: cannot find -lfoo
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
$ icpx -fast main.cpp -L. -lfoo -v
Intel(R) oneAPI DPC++ Compiler 2021.2.0 (2021.2.0.20210317)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/intel/oneapi/compiler/2021.2.0/linux/bin
Found candidate GCC installation: /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0
Selected GCC installation: /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
Found CUDA installation: /usr/local/cuda, version 11.0
 "/opt/intel/oneapi/compiler/2021.2.0/linux/bin/clang++" -cc1 -triple x86_64-unknown-linux-gnu -emit-llvm-bc -flto -flto-unit -disable-free -disable-llvm-verifier -discard-value-names -main-file-name main.cpp -mrelocation-model static -fveclib=SVML -mframe-pointer=none -menable-no-infs -menable-no-nans -menable-unsafe-fp-math -fno-signed-zeros -mreassociate -freciprocal-math -fdenormal-fp-math=preserve-sign,preserve-sign -ffp-contract=fast -fno-rounding-math -ffast-math -ffinite-math-only -mconstructor-aliases -munwind-tables -target-cpu haswell -target-feature +sse2 -target-feature -tsxldtrk -target-feature +cx16 -target-feature +sahf -target-feature -tbm -target-feature -avx512ifma -target-feature -sha -target-feature -gfni -target-feature -fma4 -target-feature -vpclmulqdq -target-feature -prfchw -target-feature +bmi2 -target-feature -cldemote -target-feature +fsgsbase -target-feature -ptwrite -target-feature -amx-tile -target-feature -uintr -target-feature +popcnt -target-feature -widekl -target-feature +aes -target-feature -avx512bitalg -target-feature -movdiri -target-feature -xsaves -target-feature -avx512er -target-feature -avxvnni -target-feature -avx512vnni -target-feature -amx-bf16 -target-feature -avx512vpopcntdq -target-feature -pconfig -target-feature -clwb -target-feature -avx512f -target-feature -xsavec -target-feature -clzero -target-feature -pku -target-feature +mmx -target-feature -lwp -target-feature -rdpid -target-feature -xop -target-feature -rdseed -target-feature -waitpkg -target-feature -kl -target-feature -movdir64b -target-feature -sse4a -target-feature -avx512bw -target-feature -clflushopt -target-feature +xsave -target-feature -avx512vbmi2 -target-feature +64bit -target-feature -avx512vl -target-feature -serialize -target-feature -hreset -target-feature +invpcid -target-feature -avx512cd -target-feature +avx -target-feature -vaes -target-feature -avx512bf16 -target-feature +cx8 -target-feature +fma -target-feature -rtm -target-feature +bmi -target-feature -enqcmd -target-feature +rdrnd -target-feature -mwaitx -target-feature +sse4.1 -target-feature +sse4.2 -target-feature +avx2 -target-feature +fxsr -target-feature -wbnoinvd -target-feature +sse -target-feature +lzcnt -target-feature +pclmul -target-feature -prefetchwt1 -target-feature +f16c -target-feature +ssse3 -target-feature -sgx -target-feature -shstk -target-feature +cmov -target-feature -avx512vbmi -target-feature -amx-int8 -target-feature +movbe -target-feature -avx512vp2intersect -target-feature +xsaveopt -target-feature -avx512dq -target-feature -adx -target-feature -avx512pf -target-feature +sse3 -fno-split-dwarf-inlining -debugger-tuning=gdb -v -resource-dir /opt/intel/oneapi/compiler/2021.2.0/linux/lib/clang/12.0.0 -I/opt/intel/oneapi/vpl/2021.2.2/include -I/opt/intel/oneapi/tbb/2021.2.0/env/../include -I/opt/intel/oneapi/mpi/2021.2.0//include -I/opt/intel/oneapi/mkl/latest/include -I/opt/intel/oneapi/ipp/2021.2.0/include -I/opt/intel/oneapi/ippcp/2021.2.0/include -I/opt/intel/oneapi/ipp/2021.2.0/include -I/opt/intel/oneapi/dpl/2021.2.0/linux/include -I/opt/intel/oneapi/dpcpp-ct/2021.2.0/include -I/opt/intel/oneapi/dnnl/2021.2.0/cpu_dpcpp_gpu_dpcpp/lib -I/opt/intel/oneapi/dev-utilities/2021.2.0/include -I/opt/intel/oneapi/dal/2021.2.0/include -I/opt/intel/oneapi/compiler/2021.2.0/linux/include -I/opt/intel/oneapi/ccl/2021.2.0/include/cpu_gpu_dpcpp -cxx-isystem /opt/intel/oneapi/clck/2021.2.0/include -internal-isystem /opt/intel/oneapi/compiler/2021.2.0/linux/bin/../compiler/include -internal-isystem /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0 -internal-isystem /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/x86_64-pc-linux-gnu -internal-isystem /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/backward -internal-isystem /usr/local/include -internal-isystem /opt/intel/oneapi/compiler/2021.2.0/linux/lib/clang/12.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -fdeprecated-macro -fdebug-compilation-dir /home/vfatenko/source/atom_dev -ferror-limit 19 -disable-cpudispatch-ifuncs -fheinous-gnu-extensions -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions -mllvm -enable-gvn-hoist -fcolor-diagnostics -vectorize-loops -vectorize-slp -fintel-compatibility -fintel-advanced-optim -mllvm -disable-hir-generate-mkl-call -mllvm -intel-libirc-allowed -mllvm -loopopt -o /tmp/main-1b97ae.o -x c++ main.cpp
clang -cc1 version 12.0.0 based upon LLVM 12.0.0git default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
ignoring duplicate directory "/opt/intel/oneapi/ipp/2021.2.0/include"
#include "..." search starts here:
#include <...> search starts here:
 /opt/intel/oneapi/vpl/2021.2.2/include
 /opt/intel/oneapi/tbb/2021.2.0/env/../include
 /opt/intel/oneapi/mpi/2021.2.0//include
 /opt/intel/oneapi/mkl/latest/include
 /opt/intel/oneapi/ipp/2021.2.0/include
 /opt/intel/oneapi/ippcp/2021.2.0/include
 /opt/intel/oneapi/dpl/2021.2.0/linux/include
 /opt/intel/oneapi/dpcpp-ct/2021.2.0/include
 /opt/intel/oneapi/dnnl/2021.2.0/cpu_dpcpp_gpu_dpcpp/lib
 /opt/intel/oneapi/dev-utilities/2021.2.0/include
 /opt/intel/oneapi/dal/2021.2.0/include
 /opt/intel/oneapi/compiler/2021.2.0/linux/include
 /opt/intel/oneapi/ccl/2021.2.0/include/cpu_gpu_dpcpp
 /opt/intel/oneapi/clck/2021.2.0/include
 /opt/intel/oneapi/compiler/2021.2.0/linux/bin/../compiler/include
 /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0
 /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/x86_64-pc-linux-gnu
 /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/backward
 /usr/local/include
 /opt/intel/oneapi/compiler/2021.2.0/linux/lib/clang/12.0.0/include
 /usr/include
End of search list.
 "/usr/bin/ld" --hash-style=gnu --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out /lib/../lib64/crt1.o /lib/../lib64/crti.o /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/crtbegin.o /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/crtfastmath.o -L. -L/opt/intel/oneapi/compiler/2021.2.0/linux/bin/../compiler/lib/intel64_lin -L/opt/intel/oneapi/compiler/2021.2.0/linux/bin/../lib -L/opt/intel/oneapi/compiler/2021.2.0/linux/bin/../compiler/lib/intel64_lin -L/usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0 -L/usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../.. -L/opt/intel/oneapi/compiler/2021.2.0/linux/bin/../lib -L/lib -L/usr/lib -plugin /opt/intel/oneapi/compiler/2021.2.0/linux/bin/../lib/icx-lto.so -plugin-opt=mcpu=haswell -plugin-opt=O3 -plugin-opt=-vector-library=SVML -plugin-opt=fintel-advanced-optim -plugin-opt=-disable-hir-generate-mkl-call -plugin-opt=-enable-multiversioning -plugin-opt=-intel-libirc-allowed -plugin-opt=-loopopt -L/opt/intel/oneapi/vpl/2021.2.2/lib -L/opt/intel/oneapi/tbb/2021.2.0/env/../lib/intel64/gcc4.8 -L/opt/intel/oneapi/mpi/2021.2.0//libfabric/lib -L/opt/intel/oneapi/mpi/2021.2.0//lib/release -L/opt/intel/oneapi/mpi/2021.2.0//lib -L/opt/intel/oneapi/mkl/latest/lib/intel64 -L/opt/intel/oneapi/ipp/2021.2.0/lib/intel64 -L/opt/intel/oneapi/ippcp/2021.2.0/lib/intel64 -L/opt/intel/oneapi/ipp/2021.2.0/lib/intel64 -L/opt/intel/oneapi/dnnl/2021.2.0/cpu_dpcpp_gpu_dpcpp/lib -L/opt/intel/oneapi/dal/2021.2.0/lib/intel64 -L/opt/intel/oneapi/compiler/2021.2.0/linux/compiler/lib/intel64_lin -L/opt/intel/oneapi/compiler/2021.2.0/linux/lib -L/opt/intel/oneapi/clck/2021.2.0/lib/intel64 -L/opt/intel/oneapi/ccl/2021.2.0/lib/cpu_gpu_dpcpp /tmp/main-1b97ae.o -lfoo -Bstatic -lsvml -Bdynamic -Bstatic -lirng -Bdynamic -lstdc++ -limf -lm -lgcc_s -lgcc -Bstatic -lirc -Bdynamic -ldl -lgcc_s -lgcc -lc -lgcc_s -lgcc -Bstatic -lirc_s -Bdynamic /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/crtend.o /lib/../lib64/crtn.o
/usr/bin/ld: skipping incompatible ./libfoo.a when searching for -lfoo
/usr/bin/ld: cannot find -lfoo
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

System short specs:

  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-1127.8.2.el7.x86_64
      Architecture: x86-64

LD output:

GNU ld version 2.27-44.base.el7
ld: supported targets: elf64-x86-64 elf32-i386 elf32-iamcu elf32-x86-64 a.out-i386-linux pei-i386 pei-x86-64 elf64-l1om elf64-k1om elf64-little elf64-big elf32-little elf32-big plugin srec symbolsrec verilog tekhex binary ihex
ld: supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu i386linux elf_l1om elf_k1om

When I try to check libfoo.a symbols with nm, I'm getting "foo.o: File format not recognized" error. NM version output:

GNU nm version 2.27-44.base.el7
nm: supported targets: elf64-x86-64 elf32-i386 elf32-iamcu elf32-x86-64 a.out-i386-linux pei-i386 pei-x86-64 elf64-l1om elf64-k1om elf64-little elf64-big elf32-little elf32-big plugin srec symbolsrec verilog tekhex binary ihex

[fatvlad1744]

Verbose compiler output

$ icpx -fast -c -o foo.o foo.cpp
$ xiar rcs libfoo.a foo.o
xiar: executing 'ar'
$ icpx -fast main.cpp -L. -lfoo
/usr/bin/ld: skipping incompatible ./libfoo.a when searching for -lfoo
/usr/bin/ld: cannot find -lfoo
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
$ icpx -fast main.cpp -L. -lfoo -v
Intel(R) oneAPI DPC++ Compiler 2021.2.0 (2021.2.0.20210317)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/intel/oneapi/compiler/2021.2.0/linux/bin
Found candidate GCC installation: /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0
Selected GCC installation: /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
Found CUDA installation: /usr/local/cuda, version 11.0
 "/opt/intel/oneapi/compiler/2021.2.0/linux/bin/clang++" -cc1 -triple x86_64-unknown-linux-gnu -emit-llvm-bc -flto -flto-unit -disable-free -disable-llvm-verifier -discard-value-names -main-file-name main.cpp -mrelocation-model static -fveclib=SVML -mframe-pointer=none -menable-no-infs -menable-no-nans -menable-unsafe-fp-math -fno-signed-zeros -mreassociate -freciprocal-math -fdenormal-fp-math=preserve-sign,preserve-sign -ffp-contract=fast -fno-rounding-math -ffast-math -ffinite-math-only -mconstructor-aliases -munwind-tables -target-cpu haswell -target-feature +sse2 -target-feature -tsxldtrk -target-feature +cx16 -target-feature +sahf -target-feature -tbm -target-feature -avx512ifma -target-feature -sha -target-feature -gfni -target-feature -fma4 -target-feature -vpclmulqdq -target-feature -prfchw -target-feature +bmi2 -target-feature -cldemote -target-feature +fsgsbase -target-feature -ptwrite -target-feature -amx-tile -target-feature -uintr -target-feature +popcnt -target-feature -widekl -target-feature +aes -target-feature -avx512bitalg -target-feature -movdiri -target-feature -xsaves -target-feature -avx512er -target-feature -avxvnni -target-feature -avx512vnni -target-feature -amx-bf16 -target-feature -avx512vpopcntdq -target-feature -pconfig -target-feature -clwb -target-feature -avx512f -target-feature -xsavec -target-feature -clzero -target-feature -pku -target-feature +mmx -target-feature -lwp -target-feature -rdpid -target-feature -xop -target-feature -rdseed -target-feature -waitpkg -target-feature -kl -target-feature -movdir64b -target-feature -sse4a -target-feature -avx512bw -target-feature -clflushopt -target-feature +xsave -target-feature -avx512vbmi2 -target-feature +64bit -target-feature -avx512vl -target-feature -serialize -target-feature -hreset -target-feature +invpcid -target-feature -avx512cd -target-feature +avx -target-feature -vaes -target-feature -avx512bf16 -target-feature +cx8 -target-feature +fma -target-feature -rtm -target-feature +bmi -target-feature -enqcmd -target-feature +rdrnd -target-feature -mwaitx -target-feature +sse4.1 -target-feature +sse4.2 -target-feature +avx2 -target-feature +fxsr -target-feature -wbnoinvd -target-feature +sse -target-feature +lzcnt -target-feature +pclmul -target-feature -prefetchwt1 -target-feature +f16c -target-feature +ssse3 -target-feature -sgx -target-feature -shstk -target-feature +cmov -target-feature -avx512vbmi -target-feature -amx-int8 -target-feature +movbe -target-feature -avx512vp2intersect -target-feature +xsaveopt -target-feature -avx512dq -target-feature -adx -target-feature -avx512pf -target-feature +sse3 -fno-split-dwarf-inlining -debugger-tuning=gdb -v -resource-dir /opt/intel/oneapi/compiler/2021.2.0/linux/lib/clang/12.0.0 -I/opt/intel/oneapi/vpl/2021.2.2/include -I/opt/intel/oneapi/tbb/2021.2.0/env/../include -I/opt/intel/oneapi/mpi/2021.2.0//include -I/opt/intel/oneapi/mkl/latest/include -I/opt/intel/oneapi/ipp/2021.2.0/include -I/opt/intel/oneapi/ippcp/2021.2.0/include -I/opt/intel/oneapi/ipp/2021.2.0/include -I/opt/intel/oneapi/dpl/2021.2.0/linux/include -I/opt/intel/oneapi/dpcpp-ct/2021.2.0/include -I/opt/intel/oneapi/dnnl/2021.2.0/cpu_dpcpp_gpu_dpcpp/lib -I/opt/intel/oneapi/dev-utilities/2021.2.0/include -I/opt/intel/oneapi/dal/2021.2.0/include -I/opt/intel/oneapi/compiler/2021.2.0/linux/include -I/opt/intel/oneapi/ccl/2021.2.0/include/cpu_gpu_dpcpp -cxx-isystem /opt/intel/oneapi/clck/2021.2.0/include -internal-isystem /opt/intel/oneapi/compiler/2021.2.0/linux/bin/../compiler/include -internal-isystem /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0 -internal-isystem /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/x86_64-pc-linux-gnu -internal-isystem /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/backward -internal-isystem /usr/local/include -internal-isystem /opt/intel/oneapi/compiler/2021.2.0/linux/lib/clang/12.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -fdeprecated-macro -fdebug-compilation-dir /home/vfatenko/source/atom_dev -ferror-limit 19 -disable-cpudispatch-ifuncs -fheinous-gnu-extensions -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions -mllvm -enable-gvn-hoist -fcolor-diagnostics -vectorize-loops -vectorize-slp -fintel-compatibility -fintel-advanced-optim -mllvm -disable-hir-generate-mkl-call -mllvm -intel-libirc-allowed -mllvm -loopopt -o /tmp/main-1b97ae.o -x c++ main.cpp
clang -cc1 version 12.0.0 based upon LLVM 12.0.0git default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
ignoring duplicate directory "/opt/intel/oneapi/ipp/2021.2.0/include"
#include "..." search starts here:
#include <...> search starts here:
 /opt/intel/oneapi/vpl/2021.2.2/include
 /opt/intel/oneapi/tbb/2021.2.0/env/../include
 /opt/intel/oneapi/mpi/2021.2.0//include
 /opt/intel/oneapi/mkl/latest/include
 /opt/intel/oneapi/ipp/2021.2.0/include
 /opt/intel/oneapi/ippcp/2021.2.0/include
 /opt/intel/oneapi/dpl/2021.2.0/linux/include
 /opt/intel/oneapi/dpcpp-ct/2021.2.0/include
 /opt/intel/oneapi/dnnl/2021.2.0/cpu_dpcpp_gpu_dpcpp/lib
 /opt/intel/oneapi/dev-utilities/2021.2.0/include
 /opt/intel/oneapi/dal/2021.2.0/include
 /opt/intel/oneapi/compiler/2021.2.0/linux/include
 /opt/intel/oneapi/ccl/2021.2.0/include/cpu_gpu_dpcpp
 /opt/intel/oneapi/clck/2021.2.0/include
 /opt/intel/oneapi/compiler/2021.2.0/linux/bin/../compiler/include
 /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0
 /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/x86_64-pc-linux-gnu
 /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/backward
 /usr/local/include
 /opt/intel/oneapi/compiler/2021.2.0/linux/lib/clang/12.0.0/include
 /usr/include
End of search list.
 "/usr/bin/ld" --hash-style=gnu --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out /lib/../lib64/crt1.o /lib/../lib64/crti.o /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/crtbegin.o /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/crtfastmath.o -L. -L/opt/intel/oneapi/compiler/2021.2.0/linux/bin/../compiler/lib/intel64_lin -L/opt/intel/oneapi/compiler/2021.2.0/linux/bin/../lib -L/opt/intel/oneapi/compiler/2021.2.0/linux/bin/../compiler/lib/intel64_lin -L/usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0 -L/usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../.. -L/opt/intel/oneapi/compiler/2021.2.0/linux/bin/../lib -L/lib -L/usr/lib -plugin /opt/intel/oneapi/compiler/2021.2.0/linux/bin/../lib/icx-lto.so -plugin-opt=mcpu=haswell -plugin-opt=O3 -plugin-opt=-vector-library=SVML -plugin-opt=fintel-advanced-optim -plugin-opt=-disable-hir-generate-mkl-call -plugin-opt=-enable-multiversioning -plugin-opt=-intel-libirc-allowed -plugin-opt=-loopopt -L/opt/intel/oneapi/vpl/2021.2.2/lib -L/opt/intel/oneapi/tbb/2021.2.0/env/../lib/intel64/gcc4.8 -L/opt/intel/oneapi/mpi/2021.2.0//libfabric/lib -L/opt/intel/oneapi/mpi/2021.2.0//lib/release -L/opt/intel/oneapi/mpi/2021.2.0//lib -L/opt/intel/oneapi/mkl/latest/lib/intel64 -L/opt/intel/oneapi/ipp/2021.2.0/lib/intel64 -L/opt/intel/oneapi/ippcp/2021.2.0/lib/intel64 -L/opt/intel/oneapi/ipp/2021.2.0/lib/intel64 -L/opt/intel/oneapi/dnnl/2021.2.0/cpu_dpcpp_gpu_dpcpp/lib -L/opt/intel/oneapi/dal/2021.2.0/lib/intel64 -L/opt/intel/oneapi/compiler/2021.2.0/linux/compiler/lib/intel64_lin -L/opt/intel/oneapi/compiler/2021.2.0/linux/lib -L/opt/intel/oneapi/clck/2021.2.0/lib/intel64 -L/opt/intel/oneapi/ccl/2021.2.0/lib/cpu_gpu_dpcpp /tmp/main-1b97ae.o -lfoo -Bstatic -lsvml -Bdynamic -Bstatic -lirng -Bdynamic -lstdc++ -limf -lm -lgcc_s -lgcc -Bstatic -lirc -Bdynamic -ldl -lgcc_s -lgcc -lc -lgcc_s -lgcc -Bstatic -lirc_s -Bdynamic /usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/crtend.o /lib/../lib64/crtn.o
/usr/bin/ld: skipping incompatible ./libfoo.a when searching for -lfoo
/usr/bin/ld: cannot find -lfoo
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

[fatvlad1744]

LD output:

GNU ld version 2.27-44.base.el7
ld: supported targets: elf64-x86-64 elf32-i386 elf32-iamcu elf32-x86-64 a.out-i386-linux pei-i386 pei-x86-64 elf64-l1om elf64-k1om elf64-little elf64-big elf32-little elf32-big plugin srec symbolsrec verilog tekhex binary ihex
ld: supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu i386linux elf_l1om elf_k1om

When I try to check libfoo.a symbols with nm, I'm getting "foo.o: File format not recognized" error. NM version output:

GNU nm version 2.27-44.base.el7
nm: supported targets: elf64-x86-64 elf32-i386 elf32-iamcu elf32-x86-64 a.out-i386-linux pei-i386 pei-x86-64 elf64-l1om elf64-k1om elf64-little elf64-big elf32-little elf32-big plugin srec symbolsrec verilog tekhex binary ihex

[AbhishekD_Intel]

Hi,

Thanks for all these details and reproducer.

We also encountered a similar issue as reported by you and we are looking into this issue internally.

We will update you as soon as we get any updates. Thanks for the complete details.

Warm Regards,

Abhishek

[Viet_H_Intel]

Hi,

Thanks for reporting this problem. I've submitted this issue to our Compiler Developer for a fix.

[Viet_H_Intel]

Can you use llvm-ar instead of xiar? xiar for icc/icpc and llvm-ar for icx/icpx.

Thanks,

[fatvlad1744]

Hi Viet,

Seems like both xiar and llvm-ar does not work on CentOS 7 and produce similar output.

On RHEL 8, both also fail but with slightly different error:

./libfoo.a: error adding symbols: archive has no index; run ranlib to add one

On Fedora 34, xiar works for me, but llvm-ar gives same error as on RHEL 8.

I'm not sure which forum this report belongs to, if not compiler support. This is linker problem, but it relates to compiler's IPO.

[Viet_H_Intel]

Can we close this thread as it isn't a compiler issue?

Thanks,

[Viet_H_Intel]

Can you check to see if your ld version is greater than 2.30?

Thanks,

[fatvlad1744]

It is 2.27, but I tried installing 2.35 from source and it did not help.
On the other hand, LLVM-based linker ld.lld worked with produced static library, however icpx does not use it by default.

[Viet_H_Intel]

It worked on my system which has ld 2.34

$ icpx -c -o foo.o foo.cpp -ipo

$ llvm-ar rcs libfoo.a foo.o

$ icpx main.cpp -L. -lfoo -ipo

/usr/bin/ld: skipping incompatible ./libfoo.a when searching for -lfoo

/usr/bin/ld: cannot find -lfoo

clang++: error: linker command failed with exit code 1 (use -v to see invocation)

$ ld -v

GNU ld version 2.30-58.el8

On another systems (ld 2.34):

$ icpx -c -o foo.o foo.cpp -ipo

$ llvm-ar rcs libfoo.a foo.o

$ icpx main.cpp -L. -lfoo -ipo

$ ld -v

GNU ld (GNU Binutils for Ubuntu) 2.34

$

[fatvlad1744]

$ icpx -fast main.cpp -L. -lfoo
/usr/local/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../x86_64-pc-linux-gnu/bin/ld: ./libfoo.a: error adding symbols: archive has no index; run ranlib to add one
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

$ /usr/local/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../x86_64-pc-linux-gnu/bin/ld -v
GNU ld (GNU Binutils) 2.36.1

[fatvlad1744]

Hovewer, this one works:
icpx -fast -fuse-ld=$(which ld.lld) main.cpp -L. -lfoo

[Viet_H_Intel]

Issue with "error adding symbols: archive has no index; run ranlib to add one" means wrong archiver; please use llvm-ar that we supply.

Thanks,

[fatvlad1744]

I tried ar, xiar, llvm-ar, none of them helped. Only using LLVM linker by providing -fuse-ld=$(which ld.lld) flag helped to link that static library.

Also, all the archivers worked fine with ld.lld.

[Viet_H_Intel]

We will find a system which has ld2.36 and try to duplicate it. In the meantime, you can use -fuse-ld=$(which ld.lld).

Thanks,

[Viet_H_Intel]

Not sure what happened at your end, but we tried on several systems and couldn't reproduce the error with ld2.36

$ export PATH=/tmp/vah/bin-2.36/bin:$PATH

$ export LD_LIBRARY_PATH=/tmp/vah/bin-2.36/lib:$LD_LIBRARY_PATH

$ which ld

/tmp/vah/bin-2.36/bin/ld

$ icpx -c -o foo.o foo.cpp -ipo; llvm-ar rcs libfoo.a foo.o ; icpx main.cpp -L. -lfoo -ipo

$ ./a.out

Hi foo!

[fatvlad1744]

Does not work for me. I'm using here RHEL 8 with standard ld 2.30, but I installed binutils 2.36.1 from source into /usr/local because I thought that old linker simply does not support the new format, and it still fails to properly parse static library archive. So you should be able to reproduce on RHEL 8. I think that same will happen on CentOS 7 with binutils installed from source, but haven't tried that yet.

[Viet_H_Intel]

Previously, I tried on RH8 and ld2.36. I just installed binutils-2.36.1 from source, but still couldn't reproduce it on RH8.

$ cat foo.cpp

#include<iostream>

void foo()

{ std::cout << "Hi foo!" << std::endl; }

$ cat main.cpp

void foo();

int main()

{ foo(); }

$ cat /etc/redhat-release

Red Hat Enterprise Linux release 8.1 (Ootpa)

$ export PATH=/tmp/vah/bin-2.36.1/bin:$PATH

$ export LD_LIBRARY_PATH=/tmp/vah/bin-2.36.1/lib:$LD_LIBRARY_PATH

$ which ld

/tmp/vah/bin-2.36.1/bin/ld

$ icpx -c -o foo.o foo.cpp -ipo; llvm-ar rcs libfoo.a foo.o ; icpx main.cpp -L. -lfoo -ipo

$ ./a.out

Hi foo!

[Viet_H_Intel]

Hi,

Any update on this? Can we close this thread?

Thanks,