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configure should have an option to specify the assembler command and the host arch #4171

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vicuna opened this Issue Nov 27, 2006 · 3 comments

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vicuna commented Nov 27, 2006

Original bug ID: 4171
Reporter: monniaux
Assigned to: @xavierleroy
Status: closed (set by @xavierleroy on 2009-03-31T11:08:53Z)
Resolution: fixed
Priority: normal
Severity: feature
Fixed in version: 3.11.0
Category: ~DO NOT USE (was: OCaml general)

Bug description

On Linux / x86_64, it is possible to have both 32-bit and 64-bit applications. 32-bit applications may sometimes be preferable (less memory is used, as experienced with Astrée).

This simply requires building OCaml for a i686 target instead of an amd64 target. I've done it, and here are the issues I've noticed:

  • there's no option to force arch to be i686-... instead of amd64-...; easy fix: the configure script should accept a -host command line option
  • there's no option to specify the assembler that ocamlopt uses:
    ./asmcomp/i386/proc.ml: Ccomp.command ("as -o " ^ F
    is hardwired. If one wants to compile in 32-bit mode on an x86_64 machine, one has to replace as by as -32 in that line.

Of course, seasoned programmers can patch OCaml's source by hand, but still...

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vicuna commented Nov 27, 2006

Comment author: monniaux

This should also affect $(AS) and $(ASPP). Note that changing $(AS) does not affect the assembler that ocamlopt uses...

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vicuna commented Feb 21, 2007

Comment author: @xavierleroy

configure does support the -host option. The ability to configure the assembler used by ocamlopt would be good, however. I keep this as a feature wish.

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vicuna commented Oct 30, 2007

Comment author: @xavierleroy

Tentative implementation in CVS trunk. To be tested on platforms other than Linux/x86_64.

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