Building PETSc with Visual Studio 2026 x64 and Intel oneAPI

This guide explains how to build PETSc using Visual Studio 2026 (x64) and Intel oneAPI (MPI + MKL) in a Cygwin environment.

Prerequisites

Required Software

Visual Studio 2026 (Community, Professional, or Enterprise)
- Install C++ development tools
Intel oneAPI (Base Toolkit + HPC Toolkit)
- Base Toolkit: Includes MKL (Math Kernel Library)
- HPC Toolkit: Includes Intel MPI
Cygwin (64-bit)
- Required packages: python3, make, git

Important: Use x64 Tools (NOT x86)

⚠️ Critical: You must use the 64-bit (x64) compiler, not the 32-bit (x86) version.

The configuration uses 64-bit libraries:

Intel MKL with lp64 (64-bit long pointers)
Intel MPI (64-bit)

Using the wrong architecture will cause linker errors.

Step-by-Step Build Instructions

1. Set Up the Environment

Open Cygwin Terminal and set up the Visual Studio x64 environment:

# Method 1: Use VS Developer Command Prompt first, then launch Cygwin
# Open: "x64 Native Tools Command Prompt for VS 2026"
# Then run: C:\cygwin64\bin\bash.exe --login

# Method 2: Set environment variables manually in Cygwin
export VSINSTALLDIR="/cygdrive/c/Program Files/Microsoft Visual Studio/2026/Community"
export VCVARSALL="$VSINSTALLDIR/VC/Auxiliary/Build/vcvarsall.bat"

# Load VS environment (x64 architecture)
cmd.exe /c "\"$VCVARSALL\" x64 && set" | sed 's/\\/\//g; s/C:/\/cygdrive\/c/g' > /tmp/vsenv.sh
source /tmp/vsenv.sh

2. Verify x64 Compiler

Check that you're using the 64-bit compiler:

cl.exe 2>&1 | grep -i "optimizing compiler"

Expected output should include "for x64":

Microsoft (R) C/C++ Optimizing Compiler Version 19.50.xxxxx for x64

❌ If you see "for x86", you're using the wrong compiler!

3. Configure Intel oneAPI Paths

Verify your Intel oneAPI installation paths:

# Intel oneAPI root (adjust if different)
INTEL_ONEAPI="/cygdrive/c/OPT/Intel/oneAPI"

# Check MKL libraries exist
ls "$INTEL_ONEAPI/mkl/2025.3/lib/"

# Check MPI libraries exist
ls "$INTEL_ONEAPI/mpi/2021.17/lib/"
ls "$INTEL_ONEAPI/mpi/2021.17/include/"

4. Navigate to PETSc Directory

export PETSC_DIR=/cygdrive/d/temp/petsc-3.24.3
cd $PETSC_DIR

5. Run Configure

Use the provided configuration script:

python3 config/examples/win-vs2026.py

Configure output:



=============================================================================================
                         Configuring PETSc to compile on your system
=============================================================================================
=============================================================================================
                                     ***** WARNING *****
  Using default C optimization flags "-O2 -QxW". You might consider manually setting
  optimal optimization flags for your system with COPTFLAGS="optimization flags" see
  config/examples/arch-*-opt.py for examples
=============================================================================================
=============================================================================================
                                     ***** WARNING *****
  Using default Cxx optimization flags "-O2 -QxW -Zm200". You might consider manually
  setting optimal optimization flags for your system with CXXOPTFLAGS="optimization flags"
  see config/examples/arch-*-opt.py for examples
=============================================================================================
Compilers:
  C Compiler:  /cygdrive/d/temp/petsc-3.24.3/lib/petsc/bin/win32fe/win32fe_cl  -GF -MD -wd4996 -Zc:preprocessor  -O2
    Version: Win32 Development Tool Front End, version 1.11.4 Fri, Sep 10, 2021  6:33:40 PM\nMicrosoft (R) C/C++ Optimizing Compiler Version 19.50.35723 for x64
  C++ Compiler:  /cygdrive/d/temp/petsc-3.24.3/lib/petsc/bin/win32fe/win32fe_cl  -GF -MD -GR -EHsc -Zc:preprocessor  -Zc:__cplusplus -O2 -Zm200  -std:c++20 -TP
    Version: Win32 Development Tool Front End, version 1.11.4 Fri, Sep 10, 2021  6:33:40 PM\nMicrosoft (R) C/C++ Optimizing Compiler Version 19.50.35723 for x64
Linkers:
  Shared linker:   /cygdrive/d/temp/petsc-3.24.3/lib/petsc/bin/win32fe/win32fe_cl  -LD  -GF -MD -wd4996 -Zc:preprocessor  -O2
Python:
  Executable: /usr/bin/python
BlasLapack:
  Libraries:  -L/cygdrive/c/OPT/Intel/oneAPI/mkl/2025.3/lib mkl_intel_lp64_dll.lib mkl_sequential_dll.lib mkl_core_dll.lib
  Unknown if this uses OpenMP (try export OMP_NUM_THREADS=<1-4> yourprogram -log_view)
  uses 8 byte integers
MPI:
  Version:    4
  Includes:   -I/cygdrive/c/OPT/Intel/oneAPI/mpi/2021.17/include
  Libraries:  /cygdrive/c/OPT/Intel/oneAPI/mpi/2021.17/lib/impi.lib
  mpiexec: /cygdrive/c/OPT/Intel/oneAPI/mpi/2021.17/bin/mpiexec.exe -localonly
  Implementation: mpich2
  MPICH_NUMVERSION: 30400002  I_MPI_NUMVERSION: 20211700300
CMake:
  Version:    3.23.2
  Executable: /usr/bin/cmake
PETSc:
  Language used to compile PETSc: C
  PETSC_ARCH: win-vs2026
  PETSC_DIR: /cygdrive/d/temp/petsc-3.24.3
  Prefix: win-vs2026
  Scalar type: real
  Precision: double
  Integer size: 4 bytes
  Single library: yes
  Shared libraries: yes
  Memory alignment from malloc(): 16 bytes
  Using GNU make: /usr/bin/make
xxx=======================================================================================xxx
 Configure stage complete. Now build PETSc libraries with:
   make PETSC_DIR=/cygdrive/d/temp/petsc-3.24.3 PETSC_ARCH=win-vs2026 all
xxx=======================================================================================xxx

6. Build PETSc

After successful configuration:

make PETSC_DIR=/cygdrive/d/temp/petsc-3.24.3 PETSC_ARCH=win-vs2026 all

Output snippet:

/usr/bin/python ./config/gmakegen.py --petsc-arch=win-vs2026
make[2]: Entering directory '/cygdrive/d/temp/petsc-3.24.3'
==========================================

See documentation/faq.html and documentation/bugreporting.html
for help with installation problems.  Please send EVERYTHING
printed out below when reporting problems.  Please check the
mailing list archives and consider subscribing.

  https://petsc.org/release/community/mailing/

==========================================
Starting make run on ASUS at Mon, 26 Jan 2026 00:51:08 -0600
Machine characteristics: CYGWIN_NT-10.0-26200 ASUS 3.5.3-1.x86_64 2024-04-03 17:25 UTC x86_64 Cygwin
-----------------------------------------
Using PETSc directory: /cygdrive/d/temp/petsc-3.24.3
Using PETSc arch: win-vs2026
-----------------------------------------
PETSC_VERSION_RELEASE    1
PETSC_VERSION_MAJOR      3
PETSC_VERSION_MINOR      24
PETSC_VERSION_SUBMINOR   3
PETSC_VERSION_DATE       "Jan 01, 2026"
PETSC_VERSION_GIT        "v3.24.3"
PETSC_VERSION_DATE_GIT   "2026-01-01 17:01:02 -0600"
-----------------------------------------
Using configure Options: --package-prefix-hash=/home/shubi/petsc-hash-pkgs --with-debugging=0 --with-blaslapack-lib="-L/cygdrive/c/OPT/Intel/oneAPI/mkl/2025.3/lib mkl_intel_lp64_dll.lib mkl_sequential_dll.lib mkl_core_dll.lib" --with-cc=/cygdrive/d/temp/petsc-3.24.3/lib/petsc/bin/win32fe/win32fe_cl --with-cxx=/cygdrive/d/temp/petsc-3.24.3/lib/petsc/bin/win32fe/win32fe_cl --with-fc=0 --with-mpi=1 --with-mpi-include=/cygdrive/c/OPT/Intel/oneAPI/mpi/2021.17/include --with-mpi-lib=/cygdrive/c/OPT/Intel/oneAPI/mpi/2021.17/lib/impi.lib --with-mpiexec="/cygdrive/c/OPT/Intel/oneAPI/mpi/2021.17/bin/mpiexec.exe -localonly" --with-64-bit-indices=0 --with-single-library=1 --with-endian=little --with-debugging=0 --with-x=0 --with-windows-graphics=0 PETSC_ARCH=win-vs2026
Using configuration flags:
#define PETSC_ARCH ""
#define PETSC_ATTRIBUTEALIGNED(size)
#define PETSC_CANNOT_START_DEBUGGER 1
#define PETSC_CLANGUAGE_C 1
#define PETSC_CXX_RESTRICT __restrict
#define PETSC_DEPRECATED_ENUM_BASE(string_literal_why)
#define PETSC_DEPRECATED_FUNCTION_BASE(string_literal_why) __declspec(deprecated(string_literal_why))
#define PETSC_DEPRECATED_MACRO_BASE(string_literal_why) PETSC_DEPRECATED_MACRO_BASE_(GCC warning string_literal_why)
#define PETSC_DEPRECATED_MACRO_BASE_(why) _Pragma(#why)
#define PETSC_DEPRECATED_OBJECT_BASE(string_literal_why) __declspec(deprecated(string_literal_why))
#define PETSC_DEPRECATED_TYPEDEF_BASE(string_literal_why)
#define PETSC_DIR "D:\\temp\\petsc-3.24.3"
#define PETSC_DIR_SEPARATOR '\\'
#define PETSC_FUNCTION_NAME_C __func__
#define PETSC_FUNCTION_NAME_CXX __func__
#define PETSC_HAVE_64BIT_BLAS_INDICES 1
#define PETSC_HAVE_ACCESS 1
#define PETSC_HAVE_ATOLL 1
#define PETSC_HAVE_CLOCK 1
#define PETSC_HAVE_CLOSESOCKET 1
#define PETSC_HAVE_CXX 1
#define PETSC_HAVE_CXX_COMPLEX 1
#define PETSC_HAVE_CXX_COMPLEX_FIX 1
#define PETSC_HAVE_CXX_DIALECT_CXX11 1
#define PETSC_HAVE_CXX_DIALECT_CXX14 1
#define PETSC_HAVE_CXX_DIALECT_CXX17 1
#define PETSC_HAVE_CXX_DIALECT_CXX20 1
#define PETSC_HAVE_DIRECT_H 1
#define PETSC_HAVE_DOS_H 1
#define PETSC_HAVE_DOUBLE_ALIGN_MALLOC 1
#define PETSC_HAVE_ERF 1
#define PETSC_HAVE_FCNTL_H 1
#define PETSC_HAVE_FENV_H 1
#define PETSC_HAVE_FE_VALUES 1
#define PETSC_HAVE_FLOAT_H 1
#define PETSC_HAVE_FREELIBRARY 1
#define PETSC_HAVE_GETCOMPUTERNAME 1
#define PETSC_HAVE_GETCWD 1
#define PETSC_HAVE_GETLASTERROR 1
#define PETSC_HAVE_GETPROCADDRESS 1
#define PETSC_HAVE_GET_USER_NAME 1
#define PETSC_HAVE_IMMINTRIN_H 1
#define PETSC_HAVE_INTTYPES_H 1
#define PETSC_HAVE_IO_H 1
#define PETSC_HAVE_ISINF 1
#define PETSC_HAVE_ISNAN 1
#define PETSC_HAVE_ISNORMAL 1
#define PETSC_HAVE_I_MPI 1
#define PETSC_HAVE_LARGE_INTEGER_U 1
#define PETSC_HAVE_LGAMMA 1
#define PETSC_HAVE_LOADLIBRARY 1
#define PETSC_HAVE_LOG2 1
#define PETSC_HAVE_LSEEK 1
#define PETSC_HAVE_MALLOC_H 1
#define PETSC_HAVE_MEMMOVE 1
#define PETSC_HAVE_MKL_INTEL_ILP64 1
#define PETSC_HAVE_MKL_LIBS 1
#define PETSC_HAVE_MPICH 1
#define PETSC_HAVE_MPIIO 1
#define PETSC_HAVE_MPI_COMBINER_CONTIGUOUS 1
#define PETSC_HAVE_MPI_COMBINER_DUP 1
#define PETSC_HAVE_MPI_COMBINER_NAMED 1
#define PETSC_HAVE_MPI_COUNT 1
#define PETSC_HAVE_MPI_F90MODULE_VISIBILITY 1
#define PETSC_HAVE_MPI_GET_ACCUMULATE 1
#define PETSC_HAVE_MPI_GET_LIBRARY_VERSION 1
#define PETSC_HAVE_MPI_INIT_THREAD 1
#define PETSC_HAVE_MPI_INT64_T 1
#define PETSC_HAVE_MPI_LARGE_COUNT 1
#define PETSC_HAVE_MPI_LONG_DOUBLE 1
#define PETSC_HAVE_MPI_NEIGHBORHOOD_COLLECTIVES 1
#define PETSC_HAVE_MPI_NONBLOCKING_COLLECTIVES 1
#define PETSC_HAVE_MPI_ONE_SIDED 1
#define PETSC_HAVE_MPI_PERSISTENT_NEIGHBORHOOD_COLLECTIVES 1
#define PETSC_HAVE_MPI_PROCESS_SHARED_MEMORY 1
#define PETSC_HAVE_MPI_REDUCE_LOCAL 1
#define PETSC_HAVE_MPI_REDUCE_SCATTER_BLOCK 1
#define PETSC_HAVE_MPI_RGET 1
#define PETSC_HAVE_MPI_WIN_CREATE 1
#define PETSC_HAVE_O_BINARY 1
#define PETSC_HAVE_PACKAGES ":blaslapack:mathlib:mpi:"
#define PETSC_HAVE_RAND 1
#define PETSC_HAVE_SETJMP_H 1
#define PETSC_HAVE_SETLASTERROR 1
#define PETSC_HAVE_STDINT_H 1
#define PETSC_HAVE_STRICMP 1
#define PETSC_HAVE_SYS_TYPES_H 1
#define PETSC_HAVE_TAU_PERFSTUBS 1
#define PETSC_HAVE_TGAMMA 1
#define PETSC_HAVE_TIME 1
#define PETSC_HAVE_TIME_H 1
#define PETSC_HAVE_TMPNAM_S 1
#define PETSC_HAVE_VA_COPY 1
#define PETSC_HAVE_VSNPRINTF 1
#define PETSC_HAVE_WINDOWSX_H 1
#define PETSC_HAVE_WINDOWS_COMPILERS 1
#define PETSC_HAVE_WINDOWS_H 1
#define PETSC_HAVE_WINSOCK2_H 1
#define PETSC_HAVE_WS2TCPIP_H 1
#define PETSC_HAVE_WSAGETLASTERROR 1
#define PETSC_HAVE_XMMINTRIN_H 1
#define PETSC_HAVE__ACCESS 1
#define PETSC_HAVE__GETCWD 1
#define PETSC_HAVE__LSEEK 1
#define PETSC_HAVE__MKDIR 1
#define PETSC_HAVE__SLEEP 1
#define PETSC_HAVE___INT64 1
#define PETSC_INTPTR_T intptr_t
#define PETSC_INTPTR_T_FMT "#" PRIxPTR
#define PETSC_IS_COLORING_MAX USHRT_MAX
#define PETSC_IS_COLORING_VALUE_TYPE short
#define PETSC_IS_COLORING_VALUE_TYPE_F integer2
#define PETSC_LEVEL1_DCACHE_LINESIZE 32
#define PETSC_LIB_DIR "/cygdrive/d/temp/petsc-3.24.3/win-vs2026/lib"
#define PETSC_LIB_NAME_SUFFIX ""
#define PETSC_MAX_PATH_LEN 4096
#define PETSC_MEMALIGN 16
#define PETSC_MISSING_GETLINE 1
#define PETSC_MISSING_SIGALRM 1
#define PETSC_MISSING_SIGBUS 1
#define PETSC_MISSING_SIGCHLD 1
#define PETSC_MISSING_SIGCONT 1
#define PETSC_MISSING_SIGHUP 1
#define PETSC_MISSING_SIGKILL 1
#define PETSC_MISSING_SIGPIPE 1
#define PETSC_MISSING_SIGQUIT 1
#define PETSC_MISSING_SIGSTOP 1
#define PETSC_MISSING_SIGSYS 1
#define PETSC_MISSING_SIGTRAP 1
#define PETSC_MISSING_SIGTSTP 1
#define PETSC_MISSING_SIGURG 1
#define PETSC_MISSING_SIGUSR1 1
#define PETSC_MISSING_SIGUSR2 1
#define PETSC_MPICC_SHOW "Unavailable"
#define PETSC_MPIU_IS_COLORING_VALUE_TYPE MPI_UNSIGNED_SHORT
#define PETSC_NEEDS_UTYPE_TYPEDEFS 1
#define PETSC_OMAKE "/usr/bin/make --no-print-directory"
#define PETSC_PKG_I_MPI_NUMVERSION 20211700300
#define PETSC_PKG_MPICH_NUMVERSION 30400002
#define PETSC_PREFETCH_HINT_NTA _MM_HINT_NTA
#define PETSC_PREFETCH_HINT_T0 _MM_HINT_T0
#define PETSC_PREFETCH_HINT_T1 _MM_HINT_T1
#define PETSC_PREFETCH_HINT_T2 _MM_HINT_T2
#define PETSC_PYTHON_EXE "/usr/bin/python"
#define PETSC_Prefetch(a,b,c) _mm_prefetch((const char*)(a),(c))
#define PETSC_REPLACE_DIR_SEPARATOR '/'
#define PETSC_SIGNAL_CAST
#define PETSC_SIZEOF_INT 4
#define PETSC_SIZEOF_LONG 4
#define PETSC_SIZEOF_LONG_LONG 8
#define PETSC_SIZEOF_SIZE_T 8
#define PETSC_SIZEOF_VOID_P 8
#define PETSC_SLSUFFIX "dll"
#define PETSC_UINTPTR_T uintptr_t
#define PETSC_UINTPTR_T_FMT "#" PRIxPTR
#define PETSC_UNUSED
#define PETSC_USE_AVX512_KERNELS 1
#define PETSC_USE_CTABLE 1
#define PETSC_USE_DMLANDAU_2D 1
#define PETSC_USE_INFO 1
#define PETSC_USE_ISATTY 1
#define PETSC_USE_LOG 1
#define PETSC_USE_MALLOC_COALESCED 1
#define PETSC_USE_MICROSOFT_TIME 1
#define PETSC_USE_PROC_FOR_SIZE 1
#define PETSC_USE_REAL_DOUBLE 1
#define PETSC_USE_SHARED_LIBRARIES 1
#define PETSC_USE_SINGLE_LIBRARY 1
#define PETSC_USING_64BIT_PTR 1
#define PETSC__BSD_SOURCE 1
#define PETSC__DEFAULT_SOURCE 1
#define R_OK 04
#define S_ISDIR(a) (((a)&_S_IFMT) == _S_IFDIR)
#define S_ISREG(a) (((a)&_S_IFMT) == _S_IFREG)
#define W_OK 02
#define X_OK 01
#define _USE_MATH_DEFINES 1
-----------------------------------------
Using C compile: /cygdrive/d/temp/petsc-3.24.3/lib/petsc/bin/win32fe/win32fe_cl -o gmakeinfo -c -GF -MD -wd4996 -Zc:preprocessor  -O2
mpicc -show: Unavailable
C compiler version: Win32 Development Tool Front End, version 1.11.4 Fri, Sep 10, 2021  6:33:40 PM
Microsoft (R) C/C++ Optimizing Compiler Version 19.50.35723 for x64
Using C++ compile: /cygdrive/d/temp/petsc-3.24.3/lib/petsc/bin/win32fe/win32fe_cl -o gmakeinfo -c -GF -MD -GR -EHsc -Zc:preprocessor  -Zc:__cplusplus -O2 -Zm200  -std:c++20 -TP  -I/cygdrive/d/temp/petsc-3.24.3/include -I/cygdrive/d/temp/petsc-3.24.3/win-vs2026/include -I/cygdrive/c/OPT/Intel/oneAPI/mpi/2021.17/include
mpicxx -show: Unavailable
C++ compiler version: Win32 Development Tool Front End, version 1.11.4 Fri, Sep 10, 2021  6:33:40 PM
Microsoft (R) C/C++ Optimizing Compiler Version 19.50.35723 for x64
-----------------------------------------
Using C/C++ linker: /cygdrive/d/temp/petsc-3.24.3/lib/petsc/bin/win32fe/win32fe_cl
Using C/C++ flags: -GF -MD -wd4996 -Zc:preprocessor  -O2
-----------------------------------------
...
...
...
...
...
...
cl : Command line warning D9024 : unrecognized source file type 'win-vs2026\obj\src\tao\unconstrained\impls\owlqn\owlqn.o', object file assumed
cl : Command line warning D9024 : unrecognized source file type 'win-vs2026\obj\src\tao\util\tao_util.o', object file assumed
cl : Command line warning D9024 : unrecognized source file type 'win-vs2026\obj\src\ml\regressor\impls\linear\linear.o', object file assumed
cl : Command line warning D9024 : unrecognized source file type 'win-vs2026\obj\src\ml\regressor\interface\dlregisregressor.o', object file assumed
cl : Command line warning D9024 : unrecognized source file type 'win-vs2026\obj\src\ml\regressor\interface\regressor.o', object file assumed
cl : Command line warning D9024 : unrecognized source file type 'win-vs2026\obj\src\ml\regressor\interface\regressorregi.o', object file assumed
   Creating library D:\temp\petsc-3.24.3\win-vs2026\lib\libpetsc.lib and object D:\temp\petsc-3.24.3\win-vs2026\lib\libpetsc.exp
make[3]: Leaving directory '/cygdrive/d/temp/petsc-3.24.3'
make[2]: Leaving directory '/cygdrive/d/temp/petsc-3.24.3'
=========================================
Now to check if the libraries are working do:
make PETSC_DIR=/cygdrive/d/temp/petsc-3.24.3 PETSC_ARCH=win-vs2026 check
=========================================

7. Test the Build

make PETSC_DIR=/cygdrive/d/temp/petsc-3.24.3 PETSC_ARCH=win-vs2026 check

Troubleshooting

Problem: "for x86" compiler detected

Symptom: Configure log shows:

Microsoft (R) C/C++ Optimizing Compiler Version 19.50.xxxxx for x86
LINK : fatal error LNK1136: invalid or corrupt file

Solution: You're using 32-bit tools. Use the x64 Native Tools Command Prompt or manually set PATH:

export PATH="/cygdrive/c/Program Files/Microsoft Visual Studio/2026/Community/VC/Tools/MSVC/14.50.xxxxx/bin/Hostx64/x64:$PATH"

Problem: "cannot open input file 'impi.lib'"

Symptom: Linker can't find Intel MPI library

Solution:

Verify Intel MPI is installed
Check the version number in your path (e.g., 2021.17 vs 2021.6)
Update paths in the configure script

Problem: Configure stops at MPI check

Symptom: configure.log ends abruptly during MPI library check

Solution:

Verify x64 architecture (see above)
Check that Intel MPI bin directory is in PATH
Run from x64 Native Tools Command Prompt

Problem: MKL libraries not found

Symptom: Cannot find mkl_intel_lp64_dll.lib

Solution:

# Find your actual MKL version
ls /cygdrive/c/OPT/Intel/oneAPI/mkl/

# Update the version in win-vs2026.py
# Change: oamkldir=oadir+'/mkl/YOUR_VERSION/lib'

Configuration Options Explained

Option	Description
`--with-cc=cl`	Use MSVC C compiler
`--with-cxx=cl`	Use MSVC C++ compiler
`--with-fc=0`	Disable Fortran (or use `ifort` if available)
`--with-debugging=0`	Optimized build (use `=1` for debug)
`--with-blaslapack-lib`	Use Intel MKL for BLAS/LAPACK
`--with-mpi-include`	Intel MPI header location
`--with-mpi-lib`	Intel MPI library location
`--with-64-bit-indices=0`	Use 32-bit indices (standard)
`--download-f2cblaslapack=1`	Download Fortran-to-C BLAS/LAPACK if no Fortran compiler

Architecture Notes

Compiler: Must be x64 (64-bit)
MKL: Uses lp64 variant (64-bit long pointers, 32-bit integers)
MPI: Intel MPI for Windows (x64)
win32fe: PETSc's wrapper tool (name is historical, works with x64)

Environment Variables After Build

Add to your environment:

export PETSC_DIR=/cygdrive/d/temp/petsc-3.24.3
export PETSC_ARCH=win-vs2026
export PATH="$PETSC_DIR/$PETSC_ARCH/lib:$PATH"

Name		Name	Last commit message	Last commit date
Latest commit History 1 Commit
include		include
lib		lib
README.md		README.md
win-vs2026.py		win-vs2026.py

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Building PETSc with Visual Studio 2026 x64 and Intel oneAPI

Prerequisites

Required Software

Important: Use x64 Tools (NOT x86)

Step-by-Step Build Instructions

1. Set Up the Environment

2. Verify x64 Compiler

3. Configure Intel oneAPI Paths

4. Navigate to PETSc Directory

5. Run Configure

6. Build PETSc

7. Test the Build

Troubleshooting

Problem: "for x86" compiler detected

Problem: "cannot open input file 'impi.lib'"

Problem: Configure stops at MPI check

Problem: MKL libraries not found

Configuration Options Explained

Architecture Notes

Environment Variables After Build

References

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Building PETSc with Visual Studio 2026 x64 and Intel oneAPI

Prerequisites

Required Software

Important: Use x64 Tools (NOT x86)

Step-by-Step Build Instructions

1. Set Up the Environment

2. Verify x64 Compiler

3. Configure Intel oneAPI Paths

4. Navigate to PETSc Directory

5. Run Configure

6. Build PETSc

7. Test the Build

Troubleshooting

Problem: "for x86" compiler detected

Problem: "cannot open input file 'impi.lib'"

Problem: Configure stops at MPI check

Problem: MKL libraries not found

Configuration Options Explained

Architecture Notes

Environment Variables After Build

References

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