error while building on windows

[ekdnam]

I am trying to build OpenBLAS on windows, following this.

After this command,

cmake .. -G "Ninja" -DCMAKE_CXX_COMPILER=clang-cl -DCMAKE_C_COMPILER=clang-cl -DCMAKE_Fortran_COMPILER=flang -DBUILD_WITHOUT_LAPACK=no -DNOFORTRAN=0 -DDYNAMIC_ARCH=ON -DCMAKE_BUILD_TYPE=Release

some errors are seen in the cmd. I am posting the entire output on the cmd here:

(base) C:\openblas\OpenBLAS-0.3.10\build>cmake .. -G "Ninja" -DCMAKE_CXX_COMPILER=clang-cl -DCMAKE_C_COMPILER=clang-cl -DCMAKE_Fortran_COMPILER=flang -DBUILD_WITHOUT_LAPACK=no -DNOFORTRAN=0 -DDYNAMIC_ARCH=ON -DCMAKE_BUILD_TYPE=Release
-- The C compiler identification is Clang 5.0.0 with MSVC-like command-line
-- The ASM compiler identification is MSVC
-- Found assembler: C:/Users/adeet/miniconda3/Library/bin/clang-cl.exe
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Users/adeet/miniconda3/Library/bin/clang-cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
CMake Warning at CMakeLists.txt:66 (message):
  CMake support is experimental.  It does not yet support all build options
  and may not produce the same Makefiles that OpenBLAS ships with.


-- GEMM multithread threshold set to 4.
-- Multi-threading enabled with 4 threads.
-- The Fortran compiler identification is Flang 99.99.1
-- Detecting Fortran compiler ABI info
-- Detecting Fortran compiler ABI info - done
-- Check for working Fortran compiler: C:/Users/adeet/miniconda3/Library/bin/flang.exe - skipped
-- Checking whether C:/Users/adeet/miniconda3/Library/bin/flang.exe supports Fortran 90
-- Checking whether C:/Users/adeet/miniconda3/Library/bin/flang.exe supports Fortran 90 - yes
CMake Warning (dev) at cmake/prebuild.cmake:472 (if):
  Policy CMP0054 is not set: Only interpret if() arguments as variables or
  keywords when unquoted.  Run "cmake --help-policy CMP0054" for policy
  details.  Use the cmake_policy command to set the policy and suppress this
  warning.

  Quoted variables like "MSVC" will no longer be dereferenced when the policy
  is set to NEW.  Since the policy is not set the OLD behavior will be used.
Call Stack (most recent call first):
  cmake/system.cmake:157 (include)
  CMakeLists.txt:69 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Running getarch
-- GETARCH results:
CORE=HASWELL
LIBCORE=haswell
NUM_CORES=4
HAVE_MMX=1
HAVE_SSE=1
HAVE_SSE2=1
HAVE_SSE3=1
HAVE_SSSE3=1
HAVE_SSE4_1=1
HAVE_SSE4_2=1
HAVE_AVX=1
HAVE_AVX2=1
HAVE_FMA3=1
MAKE += -j 4

CMake Error at cmake/prebuild.cmake:529 (MESSAGE):
  Compiling getarch_2nd failed Change Dir:
  C:/openblas/OpenBLAS-0.3.10/build/getarch2_build/CMakeFiles/CMakeTmp



  Run Build Command(s):C:/Users/adeet/miniconda3/Library/bin/ninja.exe
  cmTC_28152 && [1/2] Building C object
  CMakeFiles\cmTC_28152.dir\getarch_2nd.c.obj

  FAILED: CMakeFiles/cmTC_28152.dir/getarch_2nd.c.obj

  C:\Users\adeet\miniconda3\Library\bin\clang-cl.exe /nologo /DWIN32
  /D_WINDOWS /W3 /MDd /Zi /Ob0 /Od /RTC1 -march=native
  -DGEMM_MULTITHREAD_THRESHOLD=4 -DNO_PARALLEL_MAKE=0
  -I"C:/openblas/OpenBLAS-0.3.10/build/getarch2_build"
  -I"C:/openblas/OpenBLAS-0.3.10" -I"C:/openblas/OpenBLAS-0.3.10/build"
  /showIncludes /FoCMakeFiles\cmTC_28152.dir\getarch_2nd.c.obj
  /FdCMakeFiles\cmTC_28152.dir\ -c C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c

  clang-cl.exe: warning: unknown argument ignored in clang-cl:
  '-march=native' [-Wunknown-argument]

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(14,35): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_M'

      printf("SGEMM_UNROLL_M=%d\n", SGEMM_DEFAULT_UNROLL_M);
                                    ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(15,35): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_N'

      printf("SGEMM_UNROLL_N=%d\n", SGEMM_DEFAULT_UNROLL_N);
                                    ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(16,35): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_M'

      printf("DGEMM_UNROLL_M=%d\n", DGEMM_DEFAULT_UNROLL_M);
                                    ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(17,35): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_N'

      printf("DGEMM_UNROLL_N=%d\n", DGEMM_DEFAULT_UNROLL_N);
                                    ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(21,35): error: use of undeclared
  identifier 'CGEMM_DEFAULT_UNROLL_M'

      printf("CGEMM_UNROLL_M=%d\n", CGEMM_DEFAULT_UNROLL_M);
                                    ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(22,35): error: use of undeclared
  identifier 'CGEMM_DEFAULT_UNROLL_N'

      printf("CGEMM_UNROLL_N=%d\n", CGEMM_DEFAULT_UNROLL_N);
                                    ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(23,35): error: use of undeclared
  identifier 'ZGEMM_DEFAULT_UNROLL_M'

      printf("ZGEMM_UNROLL_M=%d\n", ZGEMM_DEFAULT_UNROLL_M);
                                    ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(24,35): error: use of undeclared
  identifier 'ZGEMM_DEFAULT_UNROLL_N'

      printf("ZGEMM_UNROLL_N=%d\n", ZGEMM_DEFAULT_UNROLL_N);
                                    ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(31,37): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_M'

      printf("CGEMM3M_UNROLL_M=%d\n", SGEMM_DEFAULT_UNROLL_M);
                                      ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(37,37): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_N'

      printf("CGEMM3M_UNROLL_N=%d\n", SGEMM_DEFAULT_UNROLL_N);
                                      ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(43,37): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_M'

      printf("ZGEMM3M_UNROLL_M=%d\n", DGEMM_DEFAULT_UNROLL_M);
                                      ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(49,37): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_N'

      printf("ZGEMM3M_UNROLL_N=%d\n", DGEMM_DEFAULT_UNROLL_N);
                                      ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(71,50): error: use of undeclared
  identifier 'SGEMM_DEFAULT_Q'

      printf("#define SLOCAL_BUFFER_SIZE\t%ld\n", (SGEMM_DEFAULT_Q * SGEMM_DEFAULT_UNROLL_N * 4 * 1 *  sizeof(float)));
                                                   ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(71,68): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_N'

      printf("#define SLOCAL_BUFFER_SIZE\t%ld\n", (SGEMM_DEFAULT_Q * SGEMM_DEFAULT_UNROLL_N * 4 * 1 *  sizeof(float)));
                                                                     ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(72,50): error: use of undeclared
  identifier 'DGEMM_DEFAULT_Q'

      printf("#define DLOCAL_BUFFER_SIZE\t%ld\n", (DGEMM_DEFAULT_Q * DGEMM_DEFAULT_UNROLL_N * 2 * 1 *  sizeof(double)));
                                                   ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(72,68): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_N'

      printf("#define DLOCAL_BUFFER_SIZE\t%ld\n", (DGEMM_DEFAULT_Q * DGEMM_DEFAULT_UNROLL_N * 2 * 1 *  sizeof(double)));
                                                                     ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(73,50): error: use of undeclared
  identifier 'CGEMM_DEFAULT_Q'

      printf("#define CLOCAL_BUFFER_SIZE\t%ld\n", (CGEMM_DEFAULT_Q * CGEMM_DEFAULT_UNROLL_N * 4 * 2 *  sizeof(float)));
                                                   ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(73,68): error: use of undeclared
  identifier 'CGEMM_DEFAULT_UNROLL_N'

      printf("#define CLOCAL_BUFFER_SIZE\t%ld\n", (CGEMM_DEFAULT_Q * CGEMM_DEFAULT_UNROLL_N * 4 * 2 *  sizeof(float)));
                                                                     ^

  C:\openblas\OpenBLAS-0.3.10\getarch_2nd.c(74,50): error: use of undeclared
  identifier 'ZGEMM_DEFAULT_Q'

      printf("#define ZLOCAL_BUFFER_SIZE\t%ld\n", (ZGEMM_DEFAULT_Q * ZGEMM_DEFAULT_UNROLL_N * 2 * 2 *  sizeof(double)));
                                                   ^

  fatal error: too many errors emitted, stopping now [-ferror-limit=]

  20 errors generated.

  ninja: build stopped: subcommand failed.



Call Stack (most recent call first):
  cmake/system.cmake:157 (include)
  CMakeLists.txt:69 (include)


-- Configuring incomplete, errors occurred!
See also "C:/openblas/OpenBLAS-0.3.10/build/CMakeFiles/CMakeOutput.log".
See also "C:/openblas/OpenBLAS-0.3.10/build/CMakeFiles/CMakeError.log".

What should be done to resolve this issue?

[martin-frbg]

Short (and generally advisable) solution would be to specify the cpu to build for instead of relying on autodetection (which failed for some reason). In DYNAMIC_ARCH builds you would set this to the oldest cpu model you expect the code to run on, e.g -DTARGET=NEHALEM, as this determines what options will be used for compiling the common code .
(Not sure yet why the autodetection failed, looks almost like "disk full" or something like that as the compiler was apparently unable to enter the temporary folder for compiling getarch_2nd, which is the tool that fetches GEMM parameters based on the cpu information that getarch put in config.h)

[ekdnam]

Okay. So a few questions.

Should I instead of DYNAMIC_ARCH write DTARGET=NEHALEM? Because I did that and it resulted the same error as before.

What do you mean by disk full? If it is a problem with the memory / OS of my machine, I may have to solve it.

[martin-frbg]

Did you write it as an option, i.e. cmake .. -DTARGET=NEHALEM - that should normally work ? (And you can use it together
with -DDYNAMIC_ARCH=ON if you want to run the same library on different cpu types, or use it without the DYNAMIC_ARCH option to build for just the one cpu type you name)

[martin-frbg]

About the "disk full" I have no idea - I only see the cmake warning that it could not enter the build directory, and the only other warning it prints before the stream of errors is just that it does not know the -march=native option (which is for gcc), but that
message should not be fatal.

[ekdnam]

The command I am using is this-

cmake .. -G "Ninja" -DCMAKE_CXX_COMPILER=clang-cl -DCMAKE_C_COMPILER=clang-cl -DCMAKE_Fortran_COMPILER=flang -DBUILD_WITHOUT_LAPACK=no -DNOFORTRAN=0 -DDYNAMIC_ARCH=ON -DTARGET=NEHALEM -DCMAKE_BUILD_TYPE=Release

Is it correct?

[ekdnam]

About the "disk full" I have no idea - I only see the cmake warning that it could not enter the build directory, and the only other warning it prints before the stream of errors is just that it does not know the -march=native option (which is for gcc), but that message should not be fatal.

Okay I may have to look into that. Thanks

[martin-frbg]

Yes that looks correct. You could try adding -DNO_AVX512=ON just to avoid the line in the build script that adds the -march=native, maybe that option is not as harmless for clang-cl as it claims

[ekdnam]

Okay, did so, and it was not a successful build. The resultant output on cmd

(base) C:\openblas\OpenBLAS\build>cmake .. -G "Ninja" -DCMAKE_CXX_COMPILER=clang-cl -DCMAKE_C_COMPILER=clang-cl -DCMAKE_Fortran_COMPILER=flang -DBUILD_WITHOUT_LAPACK=no -DNOFORTRAN=0 -DDYNAMIC_ARCH=ON -DTARGET=NEHALEM -DCMAKE_BUILD_TYPE=Release -DNO_AVX512=ON
-- The C compiler identification is Clang 5.0.0 with MSVC-like command-line
-- The ASM compiler identification is MSVC
-- Found assembler: C:/Users/adeet/miniconda3/Library/bin/clang-cl.exe
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Users/adeet/miniconda3/Library/bin/clang-cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
CMake Warning at CMakeLists.txt:66 (message):
  CMake support is experimental.  It does not yet support all build options
  and may not produce the same Makefiles that OpenBLAS ships with.


-- Targeting the NEHALEM architecture.
-- GEMM multithread threshold set to 4.
-- Multi-threading enabled with 4 threads.
-- The Fortran compiler identification is Flang 99.99.1
-- Detecting Fortran compiler ABI info
-- Detecting Fortran compiler ABI info - done
-- Check for working Fortran compiler: C:/Users/adeet/miniconda3/Library/bin/flang.exe - skipped
-- Checking whether C:/Users/adeet/miniconda3/Library/bin/flang.exe supports Fortran 90
-- Checking whether C:/Users/adeet/miniconda3/Library/bin/flang.exe supports Fortran 90 - yes
CMake Warning (dev) at cmake/prebuild.cmake:472 (if):
  Policy CMP0054 is not set: Only interpret if() arguments as variables or
  keywords when unquoted.  Run "cmake --help-policy CMP0054" for policy
  details.  Use the cmake_policy command to set the policy and suppress this
  warning.

  Quoted variables like "MSVC" will no longer be dereferenced when the policy
  is set to NEW.  Since the policy is not set the OLD behavior will be used.
Call Stack (most recent call first):
  cmake/system.cmake:157 (include)
  CMakeLists.txt:69 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Running getarch
-- GETARCH results:
CORE=NEHALEM
LIBCORE=nehalem
NUM_CORES=4
NEHALEM=1
L1_DATA_SIZE=32768
L1_DATA_LINESIZE=64
L2_SIZE=262144
L2_LINESIZE=64
DTB_DEFAULT_ENTRIES=64
DTB_SIZE=4096
HAVE_CMOV=1
HAVE_MMX=1
HAVE_SSE=1
HAVE_SSE2=1
HAVE_SSE3=1
HAVE_SSSE3=1
HAVE_SSE4_1=1
HAVE_SSE4_2=1
MAKE += -j 4

CMake Error at cmake/prebuild.cmake:529 (MESSAGE):
  Compiling getarch_2nd failed Change Dir:
  C:/openblas/OpenBLAS/build/getarch2_build/CMakeFiles/CMakeTmp



  Run Build Command(s):C:/Users/adeet/miniconda3/Library/bin/ninja.exe
  cmTC_e630f && [1/2] Building C object
  CMakeFiles\cmTC_e630f.dir\getarch_2nd.c.obj

  FAILED: CMakeFiles/cmTC_e630f.dir/getarch_2nd.c.obj

  C:\Users\adeet\miniconda3\Library\bin\clang-cl.exe /nologo /DWIN32
  /D_WINDOWS /W3 /MDd /Zi /Ob0 /Od /RTC1 -DFORCE_NEHALEM -march=native
  -DGEMM_MULTITHREAD_THRESHOLD=4 -DNO_PARALLEL_MAKE=0
  -I"C:/openblas/OpenBLAS/build/getarch2_build" -I"C:/openblas/OpenBLAS"
  -I"C:/openblas/OpenBLAS/build" /showIncludes
  /FoCMakeFiles\cmTC_e630f.dir\getarch_2nd.c.obj
  /FdCMakeFiles\cmTC_e630f.dir\ -c C:\openblas\OpenBLAS\getarch_2nd.c

  clang-cl.exe: warning: unknown argument ignored in clang-cl:
  '-march=native' [-Wunknown-argument]

  C:\openblas\OpenBLAS\getarch_2nd.c(14,35): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_M'

      printf("SGEMM_UNROLL_M=%d\n", SGEMM_DEFAULT_UNROLL_M);
                                    ^

  C:\openblas\OpenBLAS\getarch_2nd.c(15,35): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_N'

      printf("SGEMM_UNROLL_N=%d\n", SGEMM_DEFAULT_UNROLL_N);
                                    ^

  C:\openblas\OpenBLAS\getarch_2nd.c(16,35): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_M'

      printf("DGEMM_UNROLL_M=%d\n", DGEMM_DEFAULT_UNROLL_M);
                                    ^

  C:\openblas\OpenBLAS\getarch_2nd.c(17,35): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_N'

      printf("DGEMM_UNROLL_N=%d\n", DGEMM_DEFAULT_UNROLL_N);
                                    ^

  C:\openblas\OpenBLAS\getarch_2nd.c(21,35): error: use of undeclared
  identifier 'CGEMM_DEFAULT_UNROLL_M'

      printf("CGEMM_UNROLL_M=%d\n", CGEMM_DEFAULT_UNROLL_M);
                                    ^

  C:\openblas\OpenBLAS\getarch_2nd.c(22,35): error: use of undeclared
  identifier 'CGEMM_DEFAULT_UNROLL_N'

      printf("CGEMM_UNROLL_N=%d\n", CGEMM_DEFAULT_UNROLL_N);
                                    ^

  C:\openblas\OpenBLAS\getarch_2nd.c(23,35): error: use of undeclared
  identifier 'ZGEMM_DEFAULT_UNROLL_M'

      printf("ZGEMM_UNROLL_M=%d\n", ZGEMM_DEFAULT_UNROLL_M);
                                    ^

  C:\openblas\OpenBLAS\getarch_2nd.c(24,35): error: use of undeclared
  identifier 'ZGEMM_DEFAULT_UNROLL_N'

      printf("ZGEMM_UNROLL_N=%d\n", ZGEMM_DEFAULT_UNROLL_N);
                                    ^

  C:\openblas\OpenBLAS\getarch_2nd.c(31,37): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_M'

      printf("CGEMM3M_UNROLL_M=%d\n", SGEMM_DEFAULT_UNROLL_M);
                                      ^

  C:\openblas\OpenBLAS\getarch_2nd.c(37,37): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_N'

      printf("CGEMM3M_UNROLL_N=%d\n", SGEMM_DEFAULT_UNROLL_N);
                                      ^

  C:\openblas\OpenBLAS\getarch_2nd.c(43,37): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_M'

      printf("ZGEMM3M_UNROLL_M=%d\n", DGEMM_DEFAULT_UNROLL_M);
                                      ^

  C:\openblas\OpenBLAS\getarch_2nd.c(49,37): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_N'

      printf("ZGEMM3M_UNROLL_N=%d\n", DGEMM_DEFAULT_UNROLL_N);
                                      ^

  C:\openblas\OpenBLAS\getarch_2nd.c(71,50): error: use of undeclared
  identifier 'SGEMM_DEFAULT_Q'

      printf("#define SLOCAL_BUFFER_SIZE\t%ld\n", (SGEMM_DEFAULT_Q * SGEMM_DEFAULT_UNROLL_N * 4 * 1 *  sizeof(float)));
                                                   ^

  C:\openblas\OpenBLAS\getarch_2nd.c(71,68): error: use of undeclared
  identifier 'SGEMM_DEFAULT_UNROLL_N'

      printf("#define SLOCAL_BUFFER_SIZE\t%ld\n", (SGEMM_DEFAULT_Q * SGEMM_DEFAULT_UNROLL_N * 4 * 1 *  sizeof(float)));
                                                                     ^

  C:\openblas\OpenBLAS\getarch_2nd.c(72,50): error: use of undeclared
  identifier 'DGEMM_DEFAULT_Q'

      printf("#define DLOCAL_BUFFER_SIZE\t%ld\n", (DGEMM_DEFAULT_Q * DGEMM_DEFAULT_UNROLL_N * 2 * 1 *  sizeof(double)));
                                                   ^

  C:\openblas\OpenBLAS\getarch_2nd.c(72,68): error: use of undeclared
  identifier 'DGEMM_DEFAULT_UNROLL_N'

      printf("#define DLOCAL_BUFFER_SIZE\t%ld\n", (DGEMM_DEFAULT_Q * DGEMM_DEFAULT_UNROLL_N * 2 * 1 *  sizeof(double)));
                                                                     ^

  C:\openblas\OpenBLAS\getarch_2nd.c(73,50): error: use of undeclared
  identifier 'CGEMM_DEFAULT_Q'

      printf("#define CLOCAL_BUFFER_SIZE\t%ld\n", (CGEMM_DEFAULT_Q * CGEMM_DEFAULT_UNROLL_N * 4 * 2 *  sizeof(float)));
                                                   ^

  C:\openblas\OpenBLAS\getarch_2nd.c(73,68): error: use of undeclared
  identifier 'CGEMM_DEFAULT_UNROLL_N'

      printf("#define CLOCAL_BUFFER_SIZE\t%ld\n", (CGEMM_DEFAULT_Q * CGEMM_DEFAULT_UNROLL_N * 4 * 2 *  sizeof(float)));
                                                                     ^

  C:\openblas\OpenBLAS\getarch_2nd.c(74,50): error: use of undeclared
  identifier 'ZGEMM_DEFAULT_Q'

      printf("#define ZLOCAL_BUFFER_SIZE\t%ld\n", (ZGEMM_DEFAULT_Q * ZGEMM_DEFAULT_UNROLL_N * 2 * 2 *  sizeof(double)));
                                                   ^

  fatal error: too many errors emitted, stopping now [-ferror-limit=]

  20 errors generated.

  ninja: build stopped: subcommand failed.



Call Stack (most recent call first):
  cmake/system.cmake:157 (include)
  CMakeLists.txt:69 (include)


-- Configuring incomplete, errors occurred!
See also "C:/openblas/OpenBLAS/build/CMakeFiles/CMakeOutput.log".
See also "C:/openblas/OpenBLAS/build/CMakeFiles/CMakeError.log".

Each time, the call stack seems to be pointing towards prebuild.cmake. Should some changes need to be made to that file for my specific environment?

[martin-frbg]

Probably yes but I have no idea yet what needs to be done. (And I realize now that the " Compiling getarch_2nd failed Change Dir:" is actually just "Compiling getarch_2nd failed" followed by listing all steps in the build attempt. So the change dir worked, but getarch_2nd.c is missing the information that it should get from including config.h . (And the -DNO_AVX512 seems to be ignored when given as an external option - that is a separate bug)

[martin-frbg]

Hmm. Do you get a file config.h created in the build directory at all ?

[brada4]

It looks like clang-cl gets clang arguments (march..native) , not msvc.

[martin-frbg]

Yes,added for the AVX512 test - this is why i suggested the NO_AVX512 workaround that did not work. Will look into this later today.

[ekdnam]

Hmm. Do you get a file config.h created in the build directory at all ?

Not config.h but rather config.h.tmp is created.

[brada4]

Does it work when you set C compiler to clang.exe (not the msvc emulation)?

[ekdnam]

Does it work when you set C compiler to clang.exe (not the msvc emulation)?

How to do that?