msys-2.0.dll is renamed and patched cygwin1.dll.
2013/9/2 Baruch Burstein <[email protected]>
> What is this msys-2.0.dll? What functions does it supply? How is this
> different than cygwin's infamous dll?
>
>
> On Sun, Sep 1, 2013 at 4:35 PM, Ray Donnelly <[email protected]>wrote:
>
>> MSYS2 is basically Cygwin without the posix-purity stuff going and
>> instead a laser sharp focus on interoperability between MSYS2 tools
>> and Windows tools. It is "still Windows" but it uses it's own GCC that
>> links to (and creates software that links to) msys-2.0.dll that
>> provides a more posix-like set of system libraries and environment.
>>
>> A regular Windows toolchain would not be the same.
>>
>> On Sun, Sep 1, 2013 at 2:13 PM, Baruch Burstein <[email protected]>
>> wrote:
>> > If I understand your answer correctly, MSYS(2) is basically just
>> "Windows
>> > with POSIX tools, directory layout and paths", but it is still Windows.
>> If
>> > so, hen why does it need it's own toolchain, and what are "MSYS
>> binaries"?
>> > Wouldn't a regular Windows toolchain with Windows binaries be the same?
>> >
>> >
>> > On Sat, Aug 31, 2013 at 5:09 PM, LRN <[email protected]> wrote:
>> >>
>> >> -----BEGIN PGP SIGNED MESSAGE-----
>> >> Hash: SHA1
>> >>
>> >> On 31.08.2013 17:14, [email protected] wrote:
>> >> >
>> >> > #1
>> >> >
>> >> > I'm sure that there is a good reason to have two very similiar root
>> type
>> >> > directories such as MinGW and msys, but I can't see it. But, I am
>> new to
>> >> > MinGW. To me two different pseudo root directories.
>> >> >
>> >> > Can someone explain why the two are necessary and on would not
>> suffice?
>> >> > Or point me to a document which explains it?
>> >> >
>> >> > C:\MinGW and
>> >> > C:\<inGW\msys\1.0
>> >> >
>> >> > Also some directory has a link or is a link. /usr?
>> >> >
>> >>
>> >> Welcome to the land of crazy!
>> >>
>> >> First, some clarifications:
>> >>
>> >> MinGW is a toolchain (compiler, linker, import libraries for MS
>> >> runtimes, headers). It works on W32 and produces pure W32 code, just
>> >> like MSVC does. There are two independent projects that make these
>> >> toolchains:
>> >> * mingw.org - they make mingw.org toolchains (their mailing list is
>> >> mingw-users at sourceforge.net)
>> >> * mingw-w64 - they make mingw-w64 toolchains (this is mingw-w64 mailing
>> >> list you're writing to).
>> >>
>> >> I won't try to explain to you which toolchain is better (spoiler:
>> >> mingw-w64 is).
>> >>
>> >> However, you need something to a buildsystem to drive the toolchain
>> (run
>> >> it with appropriate arguments to compile things and produce binaries).
>> >> MSVC uses Visual Studio and Microsoft make (nmake, if i remember
>> >> correctly?) or some other crazy stuff.
>> >>
>> >> The decision on which buildsystem to use falls upon package developers,
>> >> not on mingw developers. Most free software packages are built by GNU
>> >> autotools (which produce GNU makefiles, which are interpreted by GNU
>> >> make).
>> >>
>> >> GNU Autotools use POSIX shell to run. GNU Makefiles produced by GNU
>> >> Autotools almost always use POSIX shell in some places. And while GNU
>> >> Make itself can be built for W32 (and thus may not have any POSIX
>> >> dependencies), these makefiles require a POSIX shell, and to produce
>> >> them ('configure' the package) you need a POSIX shell.
>> >>
>> >> MSYS provides a POSIX environment (including a POSIX shell, compatible
>> >> versions of GNU Autotools, and a POSIXly version of GNU Make) on W32.
>> >>
>> >> Thus, unless the package you are compiling uses some kind of
>> alternative
>> >> buildsystem without any POSIX dependencies (CMake, SCons, plain
>> >> makefiles with no shell code, <insert your example here>), you need
>> both
>> >> MinGW and MSYS.
>> >>
>> >> There are two projects that make MSYS:
>> >> * mignw.org - they make the original MSYS (MSYS1)
>> >> * some random people on the net (mostly it's just alexey) affiliated
>> >> mostly with mingw-w64 project - they make MSYS2
>> >>
>> >> (also, there's the Cygwin project, which has its own POSIX-only
>> >> environment, and its own toolchains, but to produce W32 binaries there
>> >> you have to cross-compile from Cygwin to W32; if you know what
>> >> "cross-compiling" is, and you're ok with it, then stop reading here and
>> >> go download&install Cygwin, and ask questions on Cygwin mailing list).
>> >>
>> >> Your MSYS is from mingw.org (i can tell from the way directories are
>> >> laid out).
>> >> I don't know which flavor of MinGW toolchains you're using though.
>> >>
>> >> At this point you should decide whether you really want to use
>> mingw-w64
>> >> toolchain or a mingw.org toolchain. If it's mingw.org, then stop
>> reading
>> >> and go to their mailing list and ask your questions there. If it's
>> >> mingw-w64, then read on.
>> >>
>> >> Since MSYS is a separate, POSIX environment, it has its own stuff - a
>> >> special toolchain (i686-pc-msys) that produces MSYS binaries, its own
>> >> set of GNU Autotools scripts. Also, all non-portable (POSIX-only) stuff
>> >> lives in MSYS - such as bash.
>> >>
>> >> Inside MSYS environment you have a virtual root directory and lots of
>> >> POSIXly things. Namely, for compatibility with real POSIX OSes, MSYS
>> has
>> >> a /usr directory (which is just an alias for the root directory).
>> >>
>> >> /usr is an alias, not a link. In fact, MSYS doesn't use any symlinks at
>> >> all. Cygwin has its own symlink emulation (which is not compatible with
>> >> W32) by default (but you can make it use W32 symlinks on newer versions
>> >> of Winodws). MSYS2 and Cygwin tend to have more complex directory
>> layouts.
>> >>
>> >> To keep MinGW stuff from conflicting with MSYS stuff, these two are
>> kept
>> >> in separate roots, and MinGW root is (usually) mounted in MSYS as
>> /mingw.
>> >> Also, when you run bash, /mingw/bin is put into your PATH before
>> >> /usr/bin, unless you set MSYSTEM=MSYS. This means that MinGW stuff has
>> >> priority over MSYS stuff. This is also the reason why MinGW make (if
>> you
>> >> have it) is (or should be) re-named, so that you use /usr/bin/make.exe,
>> >> not /mingw/bin/make.exe, because usually it's the msys-make that you
>> >> want. On the other hand, is not renamed, so you'll be using
>> >> /mingw/bin/gcc.exe, not /usr/bin/gcc.exe, because you definitely don't
>> >> want to use msys-gcc!
>> >>
>> >> When you configure W32 packages, you are advised to use
>> --prefix=/mingw,
>> >> and install them into /mingw prefix.
>> >>
>> >> OK, that should be enough. Once you decide which flavor of POSIX
>> >> environment to use (MSYS, Cygwin or MSYS2), we'll be able to talk
>> details.
>> >>
>> >> > # 2 Can different users use MinGW. When installed it uses the current
>> >> > user's name to creaste /home/usr, but, I'd like to have another user
>> >> > with its own /home/<user-name> directory. ... ls shows the owner of
>> >> > files different depending on the person loggged in, but wouldn't
>> allow
>> >> > me to create a /home/user-name, as I recall. There is no /etc/passwd.
>> >> > How can I find out about this to gain a good understanding?
>> >>
>> >> Depends on which environment you are using. In Cygwin and MSYS2 there
>> >> is, in fact, /etc/passwd.
>> >> In MSYS1, AFAIR, most of these things are stripped out and, for
>> example,
>> >> it fakes ownership (so you see that files are owned by "you", no matter
>> >> which user you are logged under).
>> >> MSYS1, AFAIR, doesn't bother with permissions checks, so all users can
>> >> use it freely. Not sure why you can't create /home/user-name.
>> >> Cygwin and MSYS2 are more picky. MSYS2 was not tested for running under
>> >> different users (at least not by me). Don't know about Cygwin, ask on
>> >> Cygwin ML.
>> >>
>> >> - --
>> >> O< ascii ribbon - stop html email! - www.asciiribbon.org
>> >> -----BEGIN PGP SIGNATURE-----
>> >> Version: GnuPG v1.4.11 (MingW32)
>> >>
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>> >> =PnNW
>> >> -----END PGP SIGNATURE-----
>> >>
>> >>
>> >>
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>> >
>> >
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>> > ˙uʍop-ǝpısdn sı ɹoʇıuoɯ ɹnoʎ 'sıɥʇ pɐǝɹ uɐɔ noʎ ɟı
>> >
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