On 05/12/12 15:17, Brandon Allbery wrote:
On Wed, Dec 5, 2012 at 12:03 AM, Chris Smith <cdsm...@gmail.com
<mailto:cdsm...@gmail.com>> wrote:
I'm curious how much of the "compile twice" situation for static and
dynamic libraries could actually be shared.
Probably none; on most platforms you're actually generating different
code (dynamic libraries require generation of position-independent
code). That said, the PPC ABI uses position-independent code even for
static libraries and I think Apple decided to go that route on Intel as
well rather than change their build system ... but if you do this then
linking to other platform-native libraries may be more difficult. Not a
problem for Apple since they control the ABI, but not something ghc can
force on libc or random libraries someone might want to use FFI with.
Sure there's a lot of differences in the generated code, but inside GHC
these differences only appear at the very last stage of the pipeline,
native code generation (or LLVM). All the stages up to that can be
shared, which accounts for roughly 80% of compilation time (IIRC).
Cheers,
Simon
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