[CMake] CMake2.5 - wrong default install location for mingw

[Gonzalo Garramuño]

Bill Hoffman wrote:
 >
 > Not really true, cygwin has its own symlinks.  See here:
 > http://www.cygwin.com/cygwin-ug-net/using.html

That's not a symlink.  That's a mount point.

And it does not effect anything I said.  Just try putting such a mount 
point on PATH (which is special).  It will get translated automatically 
whenever you call a DOS or windows app to an actual UNC or DOS path.

 >
 > Also see here:
 >
 > 
http://www.mingw.org/MinGWiki/index.php/Shells%2C%20terminals%20and%20MSYS
 >

Again, no contradiction to what I said.  cmake must run from one top 
shell or console, regardless of how many are nested.  That's the one you 
look as reference.
That's why I said looking at the envvar is a hack, while doing it with 
win32api is the proper way.

 >
 > So, even if you figured out what shell you were running from, you 
still could not write to /usr/local because that directory does not 
exist to a windows program.
 >

No.  Did you read what I wrote?

Here's some code which may be easier.  I have MSYS and a standalone Ruby 
NOT compiled for msys.

$ cat /etc/fstab
c:/msys/1.0/mingw       /mingw
c:/ActiveState/perl     /perl

$ echo $PATH
/usr/local/bin:/mingw/bin:/bin:/perl

# here i print path from ruby
$ /C/ruby/bin/ruby.exe -e "puts ENV['PATH']"
C:\msys\1.0\local\bin;c:\msys\1.0\mingw\bin;C:\msys\1.0\bin;c:\ActiveState\perl

# here I find sh.exe in path
$ /C/ruby/bin/ruby.exe -e "puts ENV['PATH'].split(';').find {|dir| 
File.exists?( dir + '/sh.exe' ) }"
C:\msys\1.0\bin

# here I get /usr/local
$ /C/ruby/bin/ruby.exe -e "puts ENV['PATH'].split(';').find {|dir| 
File.exists?( dir + '/sh.exe' ) } + '../local'"
C:\msys\1.0\bin\..\local

Explanation:

Find 'sh.exe' in $PATH.  PATH already has a DOS or UNC path from the 
MSYS/CYGWIN paths, regardless of how many mount points or 'symlinks' 
msys or cygwin uses.

 From it, you have /usr/local by doing ../local ( or just .. if sh.exe 
happens to weirdly be in (ROOT)/local/bin which you can know from the 
word local in it).  Under any Unix (Linux) layer, sh.exe is not supposed 
to be installed ANYWHERE else and must exist in some form.

MSYS and CYGWIN *MUST* translate PATH to a windows equivalent or else 
child programs would not work correctly.  Other vars, like 
LD_LIBRARY_PATH don't get this special treatment.

-- 
Gonzalo Garramuño
ggarra at advancedsl.com.ar

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