I think somehow the meson build is picking up a different runtime library than the old build, so the integer file id is from a different c runtime. depends.exe is not very helpful in trying to determine which _fdopen is being used, but I have seen this before when mixing visual studio runtimes. So rather than doing more debugging I am trying to get the builds to emit the same link commands.

One difference between the meson link and the setup.py link is that meson adds in a whole list of extra windows libraries, where setup.py only links to the python import lib (via a #pragma in pyconfig.h) I looked for how I disable the list used in meson. I see the documentation about compiler options but cannot figure out where and how to "empty out" the c_winlib and cpp_winlib options. I tried this in the top level meson.build and it didn't work @eli-schwartz ideas?

  add_global_arguments('-Dc_winlibs=', language: ['c'])
  add_global_arguments('-Dcpp_winlibs=', language:['cpp'])

For completeness, here is the link log for _multiarray_tests.cp39-win_amd64.pyd in the two builds:

meson

"link"  /MACHINE:x64 /OUT:numpy/core/_multiarray_tests.cp39-win_amd64.pyd \
numpy/core/_multiarray_tests.cp39-win_amd64.pyd.p/meson-generated__multiarray_tests.c.obj \
numpy/core/_multiarray_tests.cp39-win_amd64.pyd.p/src_common_mem_overlap.c.obj \
numpy/core/_multiarray_tests.cp39-win_amd64.pyd.p/src_common_npy_argparse.c.obj \
numpy/core/_multiarray_tests.cp39-win_amd64.pyd.p/src_common_npy_hashtable.c.obj \
"/nologo" "/release" "/nologo" "/DEBUG" \
"/PDB:numpy\core\_multiarray_tests.cp39-win_amd64.pdb" \
"/DLL" "/IMPLIB:numpy\core\_multiarray_tests.cp39-win_amd64.lib" \
"C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\libs\python39.lib" \
"kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "shell32.lib" "ole32.lib" \ 
"oleaut32.lib" "uuid.lib" "comdlg32.lib" "advapi32.lib"

setup.py

INFO: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\HostX86\x64\link.exe \
/nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO \
/LIBPATH:d:\temp\cpython_39\libs \
/LIBPATH:C:\Program Files\WindowsApps \\PythonSoftwareFoundation.Python.3.9_3.9.3568.0_x64__qbz5n2kfra8p0\libs \
/LIBPATH:C:\Users\matti\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0 \
/LIBPATH:d:\temp\cpython_39\PCbuild\amd64 \
/LIBPATH:build\temp.win-amd64-3.9 \
/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\lib\x64 \
/LIBPATH:C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\lib\um\x64 \
/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.19041.0\ucrt\x64 \
/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.19041.0\um\x64 npymath.lib \
/EXPORT:PyInit__multiarray_tests \
build\temp.win-amd64-3.9\Release\build\src.win-amd64-3.9\numpy\core\src\multiarray\_multiarray_tests.obj \
build\temp.win-amd64-3.9\Release\numpy\core\src\common\mem_overlap.obj \
build\temp.win-amd64-3.9\Release\numpy\core\src\common\npy_argparse.obj \
build\temp.win-amd64-3.9\Release\numpy\core\src\common\npy_hashtable.obj \
/OUT:build\lib.win-amd64-3.9\numpy\core\_multiarray_tests.cp39-win_amd64.pyd  \
/IMPLIB:build\temp.win-amd64-3.9\Release\build\src.win-amd64-3.9\numpy\core\src\multiarray\_multiarray_tests.cp39-win_amd64.lib

Uh oh!

BUG: tests crash on windows/msvc when built with meson #23037

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