libffi was:Re: ANNOUNCE: GHC version 7.0.1

[Simon Marlow]

On 17/11/2010 14:34, Christian Maeder wrote:
> ghc can be built without and with libffi.

Which build option are you referring to here?  libffi is required for 
FFI support in GHCi, and for FFI "wrapper" imports.  However on x86 and 
x86_64 we don't normally use libffi for wrappers, because we have a 
native implementation that is a bit faster (this is the 
UseLibFFIForAdjustors build option).

> What advantage do I gain in
> the latter case? The packages that come with ghc (displayed by "ghc-pkg
> dump") don't use it.

The RTS should depend on it.

Cheers,
	Simon


> Thanks Christian
>
>
> Am 16.11.2010 13:03, schrieb Christian Maeder:
>> http://new-www.haskell.org/ghc/dist/7.0.1/ghc-7.0.1-i386-unknown-linux.tar.bz2
>>
>> ./configure failed with:
>>
>> checking for path to top of build tree... utils/ghc-pwd/ghc-pwd: error
>> while loading shared libraries: libffi.so.5: cannot open shared object
>> file: No such file or directory
>> configure: error: cannot determine current directory
>>
>> ldd utils/ghc-pwd/ghc-pwd
>>          linux-gate.so.1 =>   (0xffffe000)
>>          libutil.so.1 =>  /lib/libutil.so.1 (0xb7718000)
>>          libdl.so.2 =>  /lib/libdl.so.2 (0xb7713000)
>>          libm.so.6 =>  /lib/libm.so.6 (0xb76e9000)
>>          libffi.so.5 =>  not found
>>          libgmp.so.3 =>  /usr/lib/libgmp.so.3 (0xb7693000)
>>          librt.so.1 =>  /lib/librt.so.1 (0xb7689000)
>>          libc.so.6 =>  /lib/libc.so.6 (0xb751e000)
>>          /lib/ld-linux.so.2 (0xb7745000)
>>          libpthread.so.0 =>  /lib/libpthread.so.0 (0xb7503000)
>>
>> The 64Bit version works, though.
>>
>> Christian
>>
>>
>> Am 16.11.2010 01:09, schrieb Ian Lynagh:
>>> How to get it
>>> ~~~~~~~~~~~~~
>>>
>>> The easy way is to go to the web page, which should be self-explanatory:
>>>
>>>          http://www.haskell.org/ghc/
>>>
>>>
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