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The attached patch allows executing a path in backslash notation. This can be tested in the Cygwin builds of GNU make with the "DOS compatibility" compile-time option of GNU make enabled, such as those from Cygwin make packages 3.79 and 3.80. $ cat dos-compat.mak default: ..\echo.exe test C:\<FULLPATH>\echo.exe test $ ./make.exe --win32 -f dos-compat.mak ..\echo.exe test test C:\<FULLPATH>\echo.exe test test The patch cannot be tested by simply running a command in backslash notation in the existing Cygwin build of bash or pdksh because these shells re-implement the search of the potential executable command. I believe these re-implementations are for improved user interaction and platform-independent security. The patch is a blind conjecture because I am not fully aware about the intention of find_exec() in spawn.cc. Its implementation seems exceedingly complicated to me, and the comments in the middle of the function about refusing a full Windows path contradict the description of the function above its prototype. --
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cygwin-dos-compatibility.txt
Description: Text document
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