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Re: [BUG] Cygwin default mounts in 1.7

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 âpowerpc-unknown-linux-gnu-gcc.exe a.câ in âbinâ
directory from windows command line, compiler fails with
âpowerpc-unknown-linux-gnu-gcc: error trying to exec 'cc1': execvp: No
such file or directoryâ. Starting compiler from bash shell works fine
and a.c is compiled.
âpowerpc-unknown-linux-gnu-gcc --print-search-dirsâ says that one of
search paths for programs is
â/usr/bin/../libexec/gcc/powerpc-unknown-linux-gnu/4.4.7/â so all
should work.
But problem is with â/usr/binâ prefix. I have made tests with âlsâ and
âpwdâ copied do âbinâ directory and found that:
- âpwdâ is â/usr/binâ
- âlsâ shows âbinâ directory content
- âls ..â shows âls: cannot access ..: No such file or directoryâ
- âls /â shows âbin  cygdrive  dev  etc  include  lib  libexec
powerpc-unknown-linux-gnu  proc  shareâ

Core of problem is that pwd for âbinâ directory is â/usr/binâ, but
â/usr/bin/..â 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





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