On 15/09/2010 08:44, Ben Lippmeier wrote:
On 14/09/2010, at 8:50 PM, Simon Peyton-Jones wrote:
This is serious: can't build GHC on MacOS.
Failing when building the .o file for GHCi. Looks like #3260.
Short term hacks: a) remove codegens for all except the actual
target arch
This didn't work. I #ifdefed out the appropriate things and removed
the modules from the cabal file, but trying to build without the
SPARC, PPC and Alpha codegen still gives the same error.
b) compile with -fPIC
Nope. Setting -fPIC in SRC_HC_OPTS just yields the same error.
The object files are also bigger with than without. For example, the
stage2 Bag.o file is 84k with PIC but 74k without.
c) reordering modules in .cabal?
I had a few goes by hand, but it didn't help, and I don't think it's
going to.
I've been poking through the source of MacOS ld, and the header file
/usr/include/mach-o/reloc.h mentioned in the original ticket. From
what I understand, the field that is overflowing is the offset from
the start of the section (text or data) to the thing that is being
relocated. The field is only 24bits long, which limits the
relocatable contents of each section to 16MB. The field is not the
offset between the source and target symbols, so reordering modules
won't help.
-fPIC should have helped by eliminating relocations from the text and
data sections. Very Strange. Does the dynamic version of the ghc
package link without errors?
Cheers,
Simon
I don't know what the difference between "relocatable contents" and
"the whole .o file" is, or how many sections we're using. In my build
tree from Sept 9th the resulting file is 44MB and it made that ok.
d) use two .o files?
Maybe.
So while digging I noticed the recent switch to Data.Map has also
caused a space blowout in some files.
In the build of today CmmStackLayout.o is 458k
desire:ghc-head-incoming benl$ ls -l
compiler/stage2/build/CmmStackLayout.o -rw-r--r-- 1 benl staff
458788 15 Sep 17:17 compiler/stage2/build/CmmStackLayout.o
But back on Sept 9th it was only 145k desire:ghc-head-validate benl$
ls -l compiler/stage2/build/CmmStackLayout.o -rw-r--r-- 1 benl
staff 145056 15 Sep 17:17 compiler/stage2/build/CmmStackLayout.o
I'm guessing this is just over-aggressive inlining.
Most of the files are also a bit bigger, but I'm not sure if this is
type inferencer or Data.Map related. I can dig more tomorrow.
Ben.
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