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Date:	Sun, 23 Sep 2012 21:08:06 +0200
Message-ID:	<CAHODtZS8jiVSJ56zD2bMm+CT7naxCBDbCNeGmdXGy5fUroFayQ@mail.gmail.com>
Subject:	Re: [BUG] Cygwin default mounts in 1.7
From:	Jiri Engelthaler <engycz AT gmail DOT com>
To:	cygwin AT cygwin DOT com
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2012/9/23 marco atzeri <marco DOT atzeri AT gmail DOT com>:
> On 9/22/2012 11:03 PM, Jiri Engelthaler wrote:
>>
>> marco atzeri <marco.atzeri <at> gmail.com> writes:
>>
>>>
>>> On 9/21/2012 10:48 AM, Jiri Engelthaler wrote:
>>>>
>>>> Hello Cygwin developers
>>>> I have a problem with cygwin default mounts
>>>> I have compiled gcc cross compiler for powerpc (some problem with arm
>>>> cross) and installed to destination directory. Installed directory
>>>> structure is (truncated)
>>>>
>>>> +bin
>>>> |   +powerpc-unknown-linux-gnu-gcc.exe
>>>> +include
>>>> +lib
>>>> +libexec
>>>> |   +gcc
>>>> |      +powerpc-unknown-linux-gnu
>>>> |          +4.4.7
>>>> |               +cc1.exe
>>>> +powerpc-unknown-linux-gnu
>>>> +share
>>>>
>>>> When I start “powerpc-unknown-linux-gnu-gcc.exe a.c” in “bin”
>>>> directory from windows command line, compiler fails with
>>>> “powerpc-unknown-linux-gnu-gcc: error trying to exec 'cc1': execvp: No
>>>> such file or directory”. Starting compiler from bash shell works fine
>>>> and a.c is compiled.
>>>> “powerpc-unknown-linux-gnu-gcc --print-search-dirs” says that one of
>>>> search paths for programs is
>>>> “/usr/bin/../libexec/gcc/powerpc-unknown-linux-gnu/4.4.7/” so all
>>>> should work.
>>>> But problem is with “/usr/bin” prefix. I have made tests with “ls” and
>>>> “pwd” copied do “bin” directory and found that:
>>>> - “pwd” is “/usr/bin”
>>>> - “ls” shows “bin” directory content
>>>> - “ls ..” shows “ls: cannot access ..: No such file or directory”
>>>> - “ls /” shows “bin  cygdrive  dev  etc  include  lib  libexec
>>>> powerpc-unknown-linux-gnu  proc  share”
>>>>
>>>> Core of problem is that pwd for “bin” directory is “/usr/bin”, but
>>>> “/usr/bin/..” is not accessible.
>>>> How to mount current directory as "/cygdrive/c/foo/bar/...../bin"
>>>> while executing pwd or ls?
>>>>
>>>>     Thank you for your answer and have a nice day.
>>>>         Jiri Engelthaler
>>>>
>>>
>>> Jiri,
>>> I tried to follow up your mail and I am confused and not really
>>> sure what is you problem.
>>> On cygwin "/bin" and "/usr/bin" are the same directory
>>> (see http://cygwin.com/cygwin-ug-net/using.html#mount-table)
>>>
>>> $ mount
>>> E:/cygwin/bin on /usr/bin type ntfs (binary,auto)
>>> E:/cygwin/lib on /usr/lib type ntfs (binary,auto)
>>>
>>> as /usr/bin is a mount of /bin.
>>>
>>> Pwd works in both the two cases:
>>> $ cd /bin
>>> $ pwd
>>> /bin
>>>
>>> $ cd /usr/bin
>>> $ pwd
>>> /usr/bin
>>>
>>> Most of the compilers/programs expect to find themself in /usr/bin,
>>> and some are referring their libraries relative to such position
>>> in this way
>>> ../libexec/gcc/powerpc-unknown-linux-gnu/4.4.7/
>>> is correctly targeting
>>> /usr/bin/../libexec/gcc/powerpc-unknown-linux-gnu/4.4.7/
>>>
>>> for this reason you should have in the PATH "/usr/bin" before "/bin"
>>> ( /bin not defined at all)
>>> to avoid that these programs looks for
>>>
>>> /bin/../libexec/gcc/powerpc-unknown-linux-gnu/4.4.7/
>>>
>>> that does not exist.
>>>
>>> What is your PATH ?
>>>
>>> On /etc/profile it is defined as:
>>> PATH="/usr/local/bin:/usr/bin:${PATH}"
>>>
>>> Regards
>>> Marco
>>>
>>>
>>
>>
>> Hello Marco.
>>    You didn't understood me fully. In bash shell all works as expected but
>> calling programs directly from windows command line don't. I wont to have
>> gcc
>> compiler with cygwin-1.dll only which can be run directly from windows
>> command
>> line or GNU make or Eclipse without need to have installed whole cygwin or
>> need
>> to run from bash.
>>    Here
>> https://docs.google.com/file/d/0B3P4bLGf7ME1OFZhY0pVd3V6YVk/edit?pli=1
>> are ls,pwd and minimal set of dll's. Try to run testcmd.cmd from bin which
>> will
>> have wrong result:
>> C:\tmp\Cyg\foo\bar\bin>pwd
>> /usr/bin
>
>
> you missed this point on
> http://cygwin.com/cygwin-ug-net/using.html#mount-table
>
> "/usr/bin and /usr/lib are by default also automatic mount points generated
> by the Cygwin DLL similar to the way the root directory is evaluated.
> /usr/bin points to the directory the Cygwin DLL is installed in, /usr/lib is
> supposed to point to the /lib directory. This choice is safe and usually
> shouldn't be changed. An fstab entry for them is not required."
>
> What are you looking for is a way to avoid it
>
>
>> Regards
>>   Jiri Engelthaler
>>

Hello Marco.
  I didn't miss the note about default mount of /usr/bin, /lib and /.
I think that this feature is a bug. According to my tests /usr/bin is
not mounted where Cygwin DLL is but where executable is. Try
testcmd.cmd in https://docs.google.com/open?id=0B3P4bLGf7ME1ZE1KUjU1WUk1V2s
.

And if I'm looking a way how to avoid this ...buggy feature..., my
answer is yes. If someone can help me with how to run gcc compiler
(see first post) which looks in ../libexec/...... for cc1.exe, I'll be
happy. My question is still same: How to access ../libexec directory
from bin directory.

  Regards
    Jiri Engelthaler

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