libffi was:Re: ANNOUNCE: GHC version 7.0.1
Christian.Maeder at dfki.de
Thu Nov 18 06:24:24 EST 2010
Am 18.11.2010 11:12, schrieb 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?
I did not use any explicit build option, but just created a
binary-distribution from sources without having /usr/lib/libffi.
> 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.
"ghc-pkg describe rts" only lists:
extra-libraries: m rt dl
also for the official ghc-7.0.1-i386-unknown-linux.tar.bz2 that is
linked against libffi (I hope not, unnecessarily). Does this mean that
GHCi is based on a different RTS?
>> Thanks Christian
>> Am 16.11.2010 13:03, schrieb Christian Maeder:
>>> ./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.
>>> 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
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