gcc vs. clang builds of 7.8.3 on OS X

Mark Lentczner mark.lentczner at gmail.com
Sun Jul 13 06:36:41 UTC 2014

It won't work in our case because the gcc 4.9 build we have references it's
own c rts lib, which is 4.9 specific, and is notably different than what is
on a stock Mac

Imagine if we were to ship a libHSrts.a, compiled against the gcc 4.9 libc
(and it's includes). Now a user without gcc 4.9 on thier system, installs
that bindist. And when they compile code that references libc, it'll
compile against the system libc (and it's includes). If tha code is paired
with Haskell code (or *is* Haskell code via the FFI), and is then linked
with libHSrts.a from the bindist.... now we have an executable that has
parts compiled against two different libc-s. This won't work unless the two
libcs (and their includes) are ABI compatible.... which I don't know if it
is between gcc's 4.9 libc, and the libc Apple ships for it's systems.

On Sat, Jul 12, 2014 at 6:40 PM, Carter Schonwald <
carter.schonwald at gmail.com> wrote:

> why wouldn't it work?
> heres my 4.9 gcc build, I believe it should work on any >= 10.7 system
> that has xcode cli tools installed,
> please let me know if it fails!
> http://www.wellposed.com/opensource/ghc/releasebuild-unofficial/ghc-7.8.3-x86_64-apple-darwin.tar.bz2
> On Sat, Jul 12, 2014 at 9:04 PM, Mark Lentczner <mark.lentczner at gmail.com>
> wrote:
>> I will try to measure on 10.7 later today.
>> Preliminary numbers for gcc 4.9 are even better than clang - it saves 12%
>> over gcc 4.2 builds. However, the gcc runtime isn't the same as the Apple
>> standard... and we are so far at a loss how to package a ghc based on 4.9
>> that would work for Mac users without gcc 4.9.
>> - Mark
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