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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