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[Asan + msvc] Cpython build failed with error LNK2001: unresolved external symbol on windows #150467

Open
#160992
Open
[Asan + msvc] Cpython build failed with error LNK2001: unresolved external symbol on windows#150467
#160992
Labels
OS-windowsbuildThe build process and cross-buildtype-bugAn unexpected behavior, bug, or error

Description

@PhoebeHui
PhoebeHui
opened on May 26, 2026

Bug report

Bug description:

Cpython build failed with error LNK2001: unresolved external symbol on windows, this error looks start from commit 10f950c, the previous commit 9846407 built successfully.

Repro steps:

1.	git clone https://github.com/python/cpython
2.	Open VS2022 x64 CMD & set _CL_= /fsanitize=address /GS- /wd5072 & set _LINK_= /InferASanLibs /incremental:no /debug
3.	cd /d C:\gitP\python\cpython\PCBuild
4.	get_externals.bat --clean-only
5.	build -e -p x64 -r --no-tkinter -v "/p:PlatformToolset=v143" "/p:WindowsTargetPlatformVersion=10.0.26100.0"

Failures

(Link target) -> 
         clang_rt.asan_dynamic_runtime_thunk-x86_64.lib(sanitizer_win_thunk_interception.cpp.obj) : error LNK2001: unresolved external symbol abort [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         clang_rt.asan_dynamic_runtime_thunk-x86_64.lib(asan_win_dynamic_runtime_thunk.cpp.obj) : error LNK2001: unresolved external symbol _initterm [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_initialize [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_uninitialize [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_uninitialize_critical [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_thread_attach [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_thread_detach [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _seh_filter_dll [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _is_c_termination_complete [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _configure_narrow_argv [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _initialize_narrow_environment [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _initialize_onexit_table [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _register_onexit_function [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _execute_onexit_table [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _crt_atexit [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _crt_at_quick_exit [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_initialize [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_uninitialize [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_uninitialize_critical [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_thread_attach [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_thread_detach [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _cexit [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __C_specific_handler [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __C_specific_handler [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility_desktop.obj) : error LNK2001: unresolved external symbol terminate [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility_desktop.obj) : error LNK2001: unresolved external symbol __current_exception [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility_desktop.obj) : error LNK2001: unresolved external symbol __current_exception_context [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol strstr [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol wcsstr [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_wcscpy_s [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_wcsncpy_s [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_wcsnlen [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_strnlen [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_calloc [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_free [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_malloc [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp___acrt_iob_func [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp___stdio_common_vswprintf_s [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp___stdio_common_vfprintf [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol wmemcpy_s [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __CxxFrameHandler4 [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(gshandlereh4.obj) : error LNK2001: unresolved external symbol __CxxFrameHandler4 [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol memcpy [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol wcsncmp [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         C:\gitP\python\cpython\PCbuild\amd64\python3t.dll : fatal error LNK1120: 42 unresolved externals [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         clang_rt.asan_dynamic_runtime_thunk-x86_64.lib(sanitizer_win_thunk_interception.cpp.obj) : error LNK2001: unresolved external symbol abort [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         clang_rt.asan_dynamic_runtime_thunk-x86_64.lib(asan_win_dynamic_runtime_thunk.cpp.obj) : error LNK2001: unresolved external symbol _initterm [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_initialize [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_uninitialize [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_uninitialize_critical [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_thread_attach [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __vcrt_thread_detach [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _seh_filter_dll [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _is_c_termination_complete [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _configure_narrow_argv [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _initialize_narrow_environment [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _initialize_onexit_table [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _register_onexit_function [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _execute_onexit_table [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _crt_atexit [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _crt_at_quick_exit [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_initialize [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_uninitialize [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_uninitialize_critical [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_thread_attach [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __acrt_thread_detach [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol _cexit [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility.obj) : error LNK2001: unresolved external symbol __C_specific_handler [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __C_specific_handler [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility_desktop.obj) : error LNK2001: unresolved external symbol terminate [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility_desktop.obj) : error LNK2001: unresolved external symbol __current_exception [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(utility_desktop.obj) : error LNK2001: unresolved external symbol __current_exception_context [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol strstr [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol wcsstr [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_wcscpy_s [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_wcsncpy_s [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_wcsnlen [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_strnlen [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_calloc [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_free [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp_malloc [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp___acrt_iob_func [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp___stdio_common_vswprintf_s [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __imp___stdio_common_vfprintf [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol wmemcpy_s [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol __CxxFrameHandler4 [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         MSVCRT.lib(gshandlereh4.obj) : error LNK2001: unresolved external symbol __CxxFrameHandler4 [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol memcpy [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         VCASAN.lib(vcasan.obj) : error LNK2001: unresolved external symbol wcsncmp [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]
         C:\gitP\python\cpython\PCbuild\amd64\python3t.dll : fatal error LNK1120: 42 unresolved externals [C:\gitP\python\cpython\PCbuild\python3tdll.vcxproj]

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

Linked PRs

Activity

  1. PhoebeHui
    added
    type-bugAn unexpected behavior, bug, or error
    on May 26, 2026
  2. aisk
    added
    OS-windows
    buildThe build process and cross-build
    on May 26, 2026

  3. PhoebeHui commented on Aug 24, 2026

    @PhoebeHui
    PhoebeHui
    on Aug 24, 2026
    Author

    Hi Team, our MSVC team regularly builds popular open-source projects, including yours, with development versions of the build tools in order to find and fix regressions in the compiler and libraries before they can ship and cause trouble for the world. This also allows us to provide advance notice of breaking changes, which is the case here. Could you please help take a look?

  4. chris-eibl commented on Oct 31, 2026

    @chris-eibl
    chris-eibl
    on Oct 31, 2026
    Member

    @PhoebeHui the attached PR will solve this and even take care of your approach using _CL_ / _LINK_. Inferring from these environment variables feels a little "too much" to me 1. Would just using "/p:EnableASAN=true" like

    set _CL_=/GS- /wd5072
set _LINK_=/incremental:no /debug
build -e -p x64 -r --no-tkinter -v "/p:PlatformToolset=v143" "/p:WindowsTargetPlatformVersion=10.0.26100.0" "/p:EnableASAN=true"

    work for you as well which would allow for a much easier

    <NoEntryPoint Condition="$(EnableASAN) != 'true'">true</NoEntryPoint>

    cc @zooba

    Footnotes

    1. would we also have to think about CL / LINK? ↩

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