How can I convert a Cygwin style path ( /cygdrive/c/foo/bar ) to Windows style ( C:/foo/bar ) (yes, with / going forward) in a GNU makefile? I have the situation of using Cygwin's make with a GCC that does not understand Cygwin style paths, so paths relative to the makefiles location that are produced by make are not accepted by the compiler.
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+1 Good question. I couldn't answer it and just mounted `/` to `\` and had to make my app only from drive c:. – khachik Dec 09 '10 at 16:13
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And how to do vice-versa, convert Win path to Cygwin? – Danijel Aug 30 '13 at 08:22
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@dan you can [consider this Q/A](https://stackoverflow.com/q/51632672/4575793) or just use `cygpath -u "C:/foo/bar"` – Cadoiz Oct 14 '21 at 11:24
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Use the shell function to execute the cygpath utility with the -w flag.
Example:
BAR := /cygdrive/c/foo/bar
WIN_BAR := $(shell cygpath -w ${BAR})
cygpath accepts a lot of additional options. See the man page for details.
Dan Moulding
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2-m for "mixed mode" seems to give me the desired / slashes in the path too. – grrussel Dec 09 '10 at 17:21
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Yeah, `-w` seems not to work as make seems to interpret the backslashes as escaping the following character. – cic Jun 02 '15 at 07:46
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For some reason, every time you give it a relative up-one directory path, cygpath -w converts it into an absolute path. – CMCDragonkai Feb 07 '17 at 03:26