[ ghc-Bugs-642810 ] Still fails to build with GCC 3.2 on Mandrake

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Bugs item #642810, was opened at 2002-11-23 10:51
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Category: Driver
Group: 5.04.1
Status: Open
Resolution: None
Priority: 5
Submitted By: Joe English (jenglish)
Assigned to: Nobody/Anonymous (nobody)
Summary: Still fails to build with GCC 3.2 on Mandrake

Initial Comment:

Following the instructions listed in other bug reports,
I bootstrapped GHC 5.04.1 on a machine with an older
GCC, then installed that on the target machine
(Mandrake 9.0, GCC 3.2).

But the mangler is still busted: compiling anything
with -O gives errors like:

| Prologue junk?: .globl __stginit_PrimPacked
| 	.type	__stginit_PrimPacked, at function
| __stginit_PrimPacked:
| 	pushl	%ebp
| 	movl	%esp, %ebp


Compiling with '-O -fasm' works, but GHC 5.04.1 still
can't recompile itself since parts of it require '-O
-fvia-C'.

I also tried downloading the current version of
ghc-asm.lprl from the CVS repository and using that;
still get the same errors.


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>Comment By: Joe English (jenglish)
Date: 2002-12-03 09:12

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Simon wrote:
> Re-opened; we really need a workaround for this one.

I've attached the patch I used to build a Mandrake RPM; this
just adds -mno-omit-leaf-frame-pointer at the relevant spot
in DriverFlags.hs.

Unfortunately, applying this patch as it stands *breaks* the
compiler if an older gcc is used, since
-mno-omit-leaf-frame-pointer was introduced in GCC 3.X.

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Comment By: Simon Marlow (simonmar)
Date: 2002-12-03 03:35

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Re-opened; we really need a workaround for this one.

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Comment By: Joe English (jenglish)
Date: 2002-11-27 16:00

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Yep, adding -mno-omit-leaf-frame-pointer did the trick. 
Problem solved!


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Comment By: Joe English (jenglish)
Date: 2002-11-26 13:18

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I think I've found the problem:  the mangler relies on
-fomit-frame-pointer, but gcc-3.2mdk turns
-momit-leaf-frame-pointer on by default.  The latter flag
(apparently) overrides the former, so non-leaf functions end
up with unexpected junk in the prologue.

I'll try -mno-omit-leaf-frame-pointer and see if that
works.  (I don't have access to my Mandrake box at the
moment; but I can get ghc to *break* in the same way on a
Red Hat 8.0 system with `ghc -c -O -optc
-momit-leaf-frame-pointer`, so that's a promising sign :-)


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Comment By: Joe English (jenglish)
Date: 2002-11-26 10:24

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Nope, that's not it either.  Using ghc -O -v -pgmc "gcc-3.2
-march=i386 -mcpu=i386" gives the same result.

Back to the drawing board...

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Comment By: Joe English (jenglish)
Date: 2002-11-26 08:00

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Aha:  Mandrake's GCC is configured to compile for i586,
while Redhat's is configured for i386.

I'll bet this is the source of the problem.  Will
investigate further...


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Comment By: Simon Marlow (simonmar)
Date: 2002-11-26 02:48

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Mandrake shipped a broken GCC, it seems.

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