Correct linker-wrapper script under Msys2 and Cygwin. Fixes #58

Author: SquallATF

plugin/src/main/resources/com/nishtahir/linker-wrapper.bat

@@ -1 +1,19 @@
+@echo off
+if defined SHELL (
+    where /q cygpath
+    if ERRORLEVEL 1 (
+        goto WINSHELL
+    )
+    setlocal enabledelayedexpansion
+    for /f %%i in ('cygpath -w %SHELL%') do (
+        if exist "%%i" (
+            "%%i" -c 'exec "$(cygpath -u "%~dp0linker-wrapper.sh")" "%*"'
+            exit !errorlevel!
+        )
+        exit 1
+    )
+    endlocal
+)
+:WINSHELL
+@echo on
 "%RUST_ANDROID_GRADLE_PYTHON_COMMAND%" "%RUST_ANDROID_GRADLE_LINKER_WRAPPER_PY%" %*

plugin/src/main/resources/com/nishtahir/linker-wrapper.py

@@ -5,7 +5,25 @@
 import subprocess
 import sys
 
-args = [os.environ['RUST_ANDROID_GRADLE_CC'], os.environ['RUST_ANDROID_GRADLE_CC_LINK_ARG']] + sys.argv[1:]
+rustcc = os.environ['RUST_ANDROID_GRADLE_CC']
+
+# Cygwin and Msys2 python need convert executable file path to unix path
+if sys.platform == 'msys' or sys.platform == 'cygwin':
+    import ctypes
+
+    cygdll = 'cygwin1.dll' if sys.platform == 'cygwin' else 'msys-2.0.dll'
+    cygwin = ctypes.cdll.LoadLibrary(cygdll)
+
+    def win2posix(path):
+        CCP_WIN_W_TO_POSIX = 3
+        size = cygwin.cygwin_conv_path(CCP_WIN_W_TO_POSIX, path, 0, 0)
+        retval = ctypes.create_string_buffer(size)
+        cygwin.cygwin_conv_path(CCP_WIN_W_TO_POSIX, path, retval, size)
+        return retval.value.decode()
+
+    rustcc = win2posix(rustcc)
+
+args = [rustcc, os.environ['RUST_ANDROID_GRADLE_CC_LINK_ARG']] + sys.argv[1:]
 
 # This only appears when the subprocess call fails, but it's helpful then.
 printable_cmd = ' '.join(pipes.quote(arg) for arg in args)