From: Eliot Moss <moss@cs.umass.edu>
To: cygwin@cygwin.com
Subject: Re: Sv: g++ and c++17 filesystem
Date: Thu, 19 Nov 2020 10:36:38 -0500 [thread overview]
Message-ID: <87a2c99c-045c-e815-4c03-bab7a89a025b@cs.umass.edu> (raw)
In-Reply-To: <000a01d6be5b$3808cad0$a81a6070$@gmail.com>
Ok, first, I admit that I was not familiar with the details of std::filesystem. However, after
looking at it, I remain unsurprised that the Cygwin and Mingw versions might be different. (I would
also not be surprised if there is a real bug in there.) The behavior I would _expect_ is that the
Cygwin version will work using Posix sorts of assumptions. While a root of C: (for example) _might_
work, /cygdrive/c is more normative on Cygwin. (I put a link to that in Cygwin's / called c, so
that, for me, /c works.) Likewise, I would expect the normative path separator to be / not \, and
an absolute path to start with /. Windows offers several kinds of symlinks, with varying semantics,
so the detailed behavior of that would be affected by the settings in the CYGWIN environment variable.
I would expect std::filesystem to present paths to construct paths to present to underlying library
calls such as open ... and on Cygwin, open uses Posix style paths.
I "get" that you want to write portable programs that use this interface, which is analogous to the
Java file path classes. In terms of how this interface works, I would expect it to _claim_ that it
is Posix, not Windows, because the paths Cygwin supports are Posix style (it _will_ recognize a few
Windows idioms, but it is correct in not advertising itself as Windows).
So it you want to do Windows-style (but abstracted with this library), I direct you to Mingw. Each
has its place. Cygwin allows one to pretend, pretty successfully though with a few small rough
edges, that one is on Linux, not Windows. That is its intent. Mingw gives you the gcc/gnu
toolchain and libraries under Windows.
I hope we're not still talking at cross purposes, though that it certainly possible!
Best wishes - EM
next prev parent reply other threads:[~2020-11-19 15:36 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-17 15:15 sten.kristian.ivarsson
2020-11-17 16:45 ` René Berber
2020-11-18 9:00 ` Sv: " sten.kristian.ivarsson
2020-11-18 16:24 ` René Berber
2020-11-18 16:31 ` Eliot Moss
2020-11-18 20:46 ` Kristian Ivarsson
2020-11-18 20:56 ` Eliot Moss
2020-11-18 21:18 ` Kristian Ivarsson
2020-11-18 23:47 ` Eliot Moss
2020-11-19 8:10 ` Sv: " sten.kristian.ivarsson
2020-11-18 21:45 ` Norton Allen
2020-11-19 0:08 ` Doug Henderson
2020-11-19 6:23 ` Brian Inglis
2020-11-19 10:03 ` Sv: " sten.kristian.ivarsson
2020-11-19 15:27 ` Brian Inglis
2020-11-20 9:37 ` Sv: " sten.kristian.ivarsson
2020-11-20 15:29 ` Brian Inglis
2020-11-20 16:11 ` Sv: " sten.kristian.ivarsson
2020-11-19 15:36 ` Eliot Moss [this message]
2020-11-20 8:31 ` sten.kristian.ivarsson
2020-11-20 18:28 ` Jonathan Yong
[not found] ` <000601d6c173$aa55d540$ff017fc0$@gmail.com>
2020-11-23 11:09 ` Sv: " Jonathan Yong
2020-11-24 9:32 ` Sv: " sten.kristian.ivarsson
2020-11-24 10:24 ` Jonathan Yong
2020-11-24 11:35 ` Sv: " sten.kristian.ivarsson
2020-11-24 12:33 ` Jonathan Yong
2020-11-24 14:01 ` Sv: " sten.kristian.ivarsson
2020-11-25 2:25 ` Jonathan Yong
2020-11-24 13:22 ` Eliot Moss
2020-11-24 14:31 ` Sv: " sten.kristian.ivarsson
2020-11-24 20:06 ` Ken Brown
2020-11-24 20:39 ` Eliot Moss
2020-11-25 8:02 ` Sv: " sten.kristian.ivarsson
2020-11-25 8:30 ` sten.kristian.ivarsson
2020-11-25 0:23 ` Brian Inglis
2020-11-25 9:00 ` Sv: " sten.kristian.ivarsson
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