Fix the GLPK build on Windows for setuptools>74.0

.github/workflows/build-wheels.yml

@@ -39,7 +39,7 @@ jobs:
           platforms: all
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.20.0
+        uses: pypa/cibuildwheel@v2.21.3
         env:
           NEW_GLPK_VERSION: ${{ inputs.glpk_version }}
           GLPK_HEADER_PATH: glpk-${{ inputs.glpk_version }}/src

scripts/build_glpk.py

@@ -1,44 +1,33 @@
 # taken from https://github.com/opencobra/cobrapy/blob/devel/appveyor/build_glpk.py
 
 import os
-import sys
-# import hashlib
 import tarfile
 import struct
 import shutil
-import setuptools.msvc
 import urllib.request as urllib2
 import subprocess
 
+GUESS_VCVARS = (
+    "C:\\Program Files\\Microsoft Visual Studio\\2022\\Enterprise\\"
+    "VC\\Auxiliary\\Build\\vcvarsall.bat"
+)
+
 # these need to be set to the latest glpk version
 glpk_version = os.getenv('NEW_GLPK_VERSION')
-# glpk_md5 = "eda7965907f6919ffc69801646f13c3e"
 
 glpk_build_dir = "glpk_build/glpk-%s" % glpk_version
 url = "http://ftp.gnu.org/gnu/glpk/glpk-%s.tar.gz" % glpk_version
 bitness = struct.calcsize("P") * 8
 arch = "x86_amd64" if bitness == 64 else "x86"
 
-
-# def md5(fname):
-#     hash = hashlib.md5()
-#     with open(fname, "rb") as f:
-#         for chunk in iter(lambda: f.read(4096), b""):
-#             hash.update(chunk)
-#     return hash.hexdigest()
-
-
-def get_vcvarsall_cmd():
-    py_ver = sys.version_info
-    if py_ver.major == 3 and py_ver.minor >= 5:
-        vc_ver = 14
-    elif py_ver.major == 3 and py_ver.minor >= 3:
-        vc_ver = 10
-    else:
-        vc_ver = 9
-    vc_path = setuptools.msvc.msvc9_find_vcvarsall(vc_ver)
-    assert vc_path is not None
-    return '"%s" %s' % (vc_path, " amd64" if bitness == 64 else "")
+def find_vcvarsall():
+    if os.path.isfile(GUESS_VCVARS):
+        return(GUESS_VCVARS)
+    for root, _, files in os.walk("C:\\Program Files\\Microsoft Visual Studio\\"):
+        for f in files:
+            if f == "vcvarsall.bat":
+                return(os.path.join(root, f))
+    raise RuntimeError("Could not find vcvarsall.bat :(")
 
 
 if not os.path.isdir("glpk_build/"):
@@ -54,10 +43,10 @@ def get_vcvarsall_cmd():
 os.chdir("%s/w%d" % (glpk_build_dir, bitness))
 if not os.path.isfile("glpk.lib"):
     shutil.copy2("config_VC", "config.h")
-    os.environ.update(setuptools.msvc.msvc14_get_vc_env(arch))
+    vc_setup = find_vcvarsall()
     subprocess.run(
-        ["nmake", "/f", "Makefile_VC"],
-        check=True,
+        f'"{vc_setup}" {arch} & nmake /f Makefile_VC',
+        check=True, shell=True
     )
 shutil.copy2("glpk.lib", "../../..")
 os.chdir("../../..")