A quick followup thought: if we add --libdir='${prefix}/%lib' to the %
c defaults, then we should introduce a NoSetLibdir command to disable
that when necessary.
-- Dave
On Nov 18, 2006, at 8:43 AM, David R. Morrison wrote:
> Dear fink developers,
>
> I solicit your comments on the proposals below to (1) change the
> storage location for 64bit libraries and formalize this into
> policy, and (2) add a new percent expansion to fink, one whose
> value would be dependent on some other things.
>
> The issue is the correct storage location for 64bit libraries.
> We've known for some time that 64bit libraries and 64bit
> executables are not compatible with 32bit ones, and a decision was
> reached last spring to store 64bit libraries in /sw/lib64
> (analogous to some linux distributions). However, it has since
> been pointed out by Peter O'Gorman that gcc makes some assumptions
> about where 64bit libraries are being stored: either /sw/lib/ppc64
> for powerpc hardware, or /sw/lib/x86_64 for intel hardware.
>
> Proposal #1 is that we use these storage locations for our 64bit
> libraries, and make that fink policy. (There are only two packages
> which have adopted the old scheme -- gmp-64bit and openmcl-64bit --
> and we would need to break binary compatibility for these by moving
> their shared libs in a upgrade. However, nothing depends on them,
> and they are only present in unstable.)
>
> To make packaging easier on multiple architectures, and in
> particular to make it easier to use the fink "variants" idea to
> package 64bit libraries and 32bit libraries in the same
> architecture, Proposal #2 is to introduce a new percent expansion %
> lib which would behave as follows:
> 1) If the package does not have Type -64bit, then %lib expands to
> lib.
> 2) If the package does have Type -64bit, then the expansion of %
> lib depends on the architecture: it either expands to lib/ppc64 for
> powerpc, or lib/x86_64 for i386.
> 3) Possibly, the default value for LDFLAGS should become -L%p/%lib
> instead of -L%p/lib.
> 4) Possibly, the default contents of %c should be expanded from "--
> prefix=%p" to "--prefix=%p --libdir='${prefix}/%lib' ".
>
> So, a typical packaging which used this could include the following
> lines (explanation afterwards):
>
> Package: gmp%type_pkg[-64bit]
> Type: -64bit (binary)
> Depends: (%type_raw[-64bit] = -64bit) 64bit-cpu
> NoSetLDFLAGS: true
> SetLDFLAGS: -L%p/%lib
> ConfigureParams: --libdir='${prefix}/%lib'
> SplitOff: <<
> Package: %N-shlibs
> Files: %lib/libgmp.*.dylib
> Shlibs: <<
> %p/%lib/libgmp.3.dylib 8.0.0 %n (>= 4.2.1-1)
> <<
> <<
>
> This fragment of an .info file would be used to build both the gmp
> and gmp-64bit packages; would build splitoffs for each; the 64bit
> variant depends on the 64bit-cpu virtual package as it should; the
> LDFLAGS is reset to the correct location (unless we make that part
> of the default); the configure script is fed the correct library
> directory (unless we make that part of the default); the shared
> library files are correctly moved into the -shlibs splitoff, and
> they are correctly documented in the Shlibs field.
>
> Comments?
>
> -- Dave
>
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