Re: -package-name flag in 6.10.x

[Duncan Coutts]

On Wed, 2009-11-25 at 04:56 +, Malcolm Wallace wrote:
 Moreover, when I attempt to use the flag, like so:
 
  $ ghc -package-name hat-2.06 ...
  command line: cannot parse 'hat-2.06' as a package identifier
 
 This used to work with ghc-6.6.x and ghc-6.8.x, but seems to have  
 stopped working with ghc-6.10.x.  I surmise that the leading zero  
 after the version point separator is to blame?  It seems an  
 unfortunate regression.

On the contrary, it is good that it checks this now. The package name
compiled into the code really ought to match the package name registered
with ghc-pkg and the latter is a package identifier, not an arbitrary
string.

In principle it would be possible to parse 2.06 as a Version [2,6],
however I think we decided that allowing that redundancy in the original
string is not a good idea since people might expect 2.6 and 2.06 to be
different. It would also mean we could not rely on lossless round trips
between parser and printer which would be annoying for things like
finding the file or directory containing a package (imagine we go
looking for 2.6/ when the files are really in 2.06/).

Duncan

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-package-name flag in 6.10.x

[Malcolm Wallace]

The ghc documentation at
http://www.haskell.org/ghc/docs/latest/html/users_guide/packages.html
says the following:

-package-name foo
 Tells GHC the the module being compiled forms part of package  
foo.  If this flag is omitted (a very common case) then the default  
package main is assumed.


 Note: the argument to -package-name should be the full package  
identifier for the package, that is it should include the version  
number. For example: -package mypkg-1.2.


I observe that the example uses -package rather than -package-name,  
and wonder if this is a mistake.  Moreover, when I attempt to use the  
flag, like so:


$ ghc -package-name hat-2.06 ...
command line: cannot parse 'hat-2.06' as a package identifier

This used to work with ghc-6.6.x and ghc-6.8.x, but seems to have  
stopped working with ghc-6.10.x.  I surmise that the leading zero  
after the version point separator is to blame?  It seems an  
unfortunate regression.


Regards,
Malcolm

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