Added fallback for finding ld on MinGW Cygwin

setup.py

@@ -118,6 +118,18 @@ class RequiredDependencyException(Exception):
 PLATFORM_MINGW = "mingw" in ccompiler.get_default_compiler()
 PLATFORM_PYPY = hasattr(sys, "pypy_version_info")
 
+if sys.platform == "win32" and PLATFORM_MINGW:
+    from distutils import cygwinccompiler
+
+    cygwin_versions = cygwinccompiler.get_versions()
+    if cygwin_versions[1] is None:
+        # ld version is None
+        # distutils cygwinccompiler might fetch the ld path from gcc
+        # Try the normal path instead
+        cygwin_versions = list(cygwin_versions)
+        cygwin_versions[1] = cygwinccompiler._find_exe_version("ld -v")
+        cygwinccompiler.get_versions = lambda: tuple(cygwin_versions)
+
 
 def _dbg(s, tp=None):
     if DEBUG:

winbuild/appveyor_install_msys2_deps.sh

@@ -3,12 +3,16 @@
 mkdir /var/cache/pacman/pkg
 pacman -S --noconfirm mingw32/mingw-w64-i686-python3-pip \
 	   mingw32/mingw-w64-i686-python3-setuptools \
+	   mingw32/mingw-w64-i686-python3-pytest \
+	   mingw32/mingw-w64-i686-python3-pytest-cov \
 	   mingw32/mingw-w64-i686-python2-pip \
 	   mingw32/mingw-w64-i686-python2-setuptools \
+	   mingw32/mingw-w64-i686-python2-pytest \
+	   mingw32/mingw-w64-i686-python2-pytest-cov \
 	   mingw-w64-i686-libjpeg-turbo \
 	   mingw-w64-i686-libimagequant
 
 C:/msys64/mingw32/bin/python3 -m pip install --upgrade pip
 
-/mingw32/bin/pip install pytest pytest-cov olefile
-/mingw32/bin/pip3 install pytest pytest-cov olefile
+/mingw32/bin/pip install olefile
+/mingw32/bin/pip3 install olefile