hard-reset scipy source directory for recompilation on windows

recipe/bld.bat

@@ -0,0 +1,9 @@
+@echo on
+setlocal enabledelayedexpansion
+
+:: copy %SRC_DIR%/base somewhere to be able to hard-reset state in build-output.bat
+mkdir .\backup
+robocopy base backup /E >nul
+:: for whatever reason, robocopy returns 1 in case of success, see
+:: https://learn.microsoft.com/en-us/troubleshoot/windows-server/backup-and-storage/return-codes-used-robocopy-utility
+if %ERRORLEVEL% neq 1 exit 1

recipe/build-output.bat

@@ -1,6 +1,9 @@
 @echo on
 setlocal enabledelayedexpansion
 
+:: for reason see source section in meta.yaml & below
+cd base
+
 REM these are done automatically for openblas by numpy.distutils, but
 REM not for our blas libraries
 echo %LIBRARY_LIB%\blas.lib > %LIBRARY_LIB%\blas.fobjects
@@ -38,8 +41,8 @@ REM TODO: rewrite wrap_g77_abi.f with iso_c_binding when the compiler supports i
 cl.exe /I%NP_INC% /I%PY_INC% scipy\_build_utils\src\wrap_g77_abi_c.c -c /MD
 if %ERRORLEVEL% neq 0 exit 1
 echo. > scipy\_build_utils\src\wrap_g77_abi_c.c
-echo %SRC_DIR%\wrap_g77_abi_c.obj >> %LIBRARY_LIB%\lapack.fobjects
-echo %SRC_DIR%\wrap_g77_abi_c.obj >> %LIBRARY_LIB%\lapack.cobjects
+echo %SRC_DIR%\base\wrap_g77_abi_c.obj >> %LIBRARY_LIB%\lapack.fobjects
+echo %SRC_DIR%\base\wrap_g77_abi_c.obj >> %LIBRARY_LIB%\lapack.cobjects
 
 REM Add a file to load the fortran wrapper libraries in scipy/.libs
 del scipy\_distributor_init.py
@@ -79,8 +82,10 @@ if "%PKG_NAME%"=="scipy" (
         set "g=%%f"
         rmdir /s /q %SP_DIR%\scipy\!g:/=\!
     )
-)
 
-:: clean up between invocations
-rmdir /s /q build
-del wrap_g77_abi_c.obj
+    REM hard-reset %SRC_DIR%\base to original state; see prep in bld.bat
+    cd ..
+    rmdir /s /q base
+    REM `move` can spuriously fail with "Access Denied"; use `robocopy /MOVE` instead
+    robocopy backup base /E /MOVE >nul
+)

recipe/build-output.sh

@@ -1,6 +1,9 @@
 #!/bin/bash
 set -ex
 
+# for reason see source section in meta.yaml
+cd base
+
 # Set a few environment variables that are not set due to
 # https://github.com/conda/conda-build/issues/3993
 export PIP_NO_BUILD_ISOLATION=True

recipe/build.sh

@@ -1,6 +1,9 @@
 #!/bin/bash
 set -ex
 
+# for reason see source section in meta.yaml
+cd base
+
 mkdir builddir
 
 # HACK: extend $CONDA_PREFIX/meson_cross_file that's created in

recipe/meta.yaml

@@ -14,6 +14,8 @@ source:
   # the submodules (not in tarball due to dear-github/dear-github#214)
   - url: https://github.com/scipy/scipy/archive/refs/tags/v{{ version }}.tar.gz
     sha256: 8f08e1742c9b09eb58640fa5a56031d6e1844806899e883fbe7447ca86fe8c55
+    # need separate folder to do full reset on windows, see build-output.bat
+    folder: base
     patches:
       # backport https://github.com/scipy/scipy/pull/18006
       - patches/0001-BLD-use-a-relative-path-to-numpy-pybind11-pythran-in.patch
@@ -32,17 +34,17 @@ source:
   # https://github.com/scipy/scipy/tree/v{{ version }}/scipy/_lib
   - git_url: https://github.com/scipy/boost-headers-only.git
     git_rev: 3af99e6d566043072e95bc882d32c9c26f37e0ba
-    folder: scipy/_lib/boost
+    folder: base/scipy/_lib/boost
   - git_url: https://github.com/scipy/highs.git
     git_rev: 4a122958a82e67e725d08153e099efe4dad099a2
-    folder: scipy/_lib/highs
+    folder: base/scipy/_lib/highs
   - git_url: https://github.com/scipy/unuran.git
     git_rev: a63d39160e5ecc4402e7ed0e8417f4c3ff9634cb
-    folder: scipy/_lib/unuran
+    folder: base/scipy/_lib/unuran
   # https://github.com/scipy/scipy/tree/v{{ version }}/scipy/sparse/linalg/_propack
   - git_url: https://github.com/scipy/PROPACK.git
     git_rev: cc32f3ba6cf941e4f9f96d96e2fc5762ea0c1014
-    folder: scipy/sparse/linalg/_propack/PROPACK
+    folder: base/scipy/sparse/linalg/_propack/PROPACK
 
 build:
   number: 2
@@ -266,7 +268,7 @@ outputs:
 about:
   home: http://www.scipy.org/
   license: BSD-3-Clause
-  license_file: LICENSE.txt
+  license_file: base/LICENSE.txt
   summary: Scientific Library for Python
   description: |
     SciPy is a Python-based ecosystem of open-source software for mathematics,