#5240: help GNU ld to use less memory when linking libraries compiled with
-split-
objs.
---------------------------------+------------------------------------------
Reporter: int-e | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 7.0.3 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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This is a well-known problem, but I didn't find a previous report here,
probably because it is mainly a GNU ld issue. The problem is that with
-split-objs, linking, say, ghc, takes a trememndous amount of memory.
Part of this problem will be fixed in ld:
http://sourceware.org/bugzilla/show_bug.cgi?id=12682
In this bug report, Nick Clifton suggests to use '--hash-size=31' and
possibly '--reduce-memory-overhead' when invoking ld. Since ghc is
invoking gcc for linking, that would mean passing '-Xlinker --hash-
size=31' and perhaps '-Xlinker --reduce-memory-overhead' to gcc.
Can we do that? Care needs to be taken if people use the -pgmL option, and
we should make sure that gcc is actually using GNU ld.
In my experiments (linking ghc), --hash-size=31 helps, reducing memory
usage by about a factor of 1/2; --reduce-memory-overhead without --hash-
size=31 also helps (saving about 1/3), but has no noticable effect in
connection with --hash-size=31. Based on that I'd suggest to only use
--hash-size=31.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5240>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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