[mercury-users] undefined reference to `MR_grade_v1_asm_fast_tags2' ????

[Fergus Henderson]

On 27-May-1999, Marko Schuetz <marko at ki.informatik.uni-frankfurt.de> wrote:
> kind% nm $d/i386-unknown-freebsd3.0/libmer_rt.a | grep -i grade
> mercury_grade.o:
> 00000000 R MR_grade_v1_asm_fast_gc_tags2
> 00000001 R MR_runtime_grade
> kind% nm $d/i386-unknown-freebsd3.0/libmer_rt.so | grep -i grade
> 0000c4f1 R MR_grade_v1_asm_fast_gc_tags2_picreg
> 0000c4f2 R MR_runtime_grade
> kind% 

Ah.  I think the problem is due to the the use of shared libraries on
FreeBSD with Intel *86.  Mercury has been ported to FreeBSD before,
with shared libraries, but perhaps that was a non-x86 system.
Getting PIC shared libraries to work with Mercury on Intel *86 is a little bit
complicated, because of the way the Mercury compiler and PIC code both
want to use the same register.  For details, see the README.Linux file.
For FreeBSD, I think the situation will be the same as for Linux.
If my diagnosis is correct, the problem that you are observing arises
because `ml' (the Mercury linker) does not use static linking by default
for FreeBSD the way it does for Linux.

Please try both

	(1) adding `MLFLAGS = --static' to your Mmakefile
	[This will give you a statically linked executable.]

and	

	(2) adding `MLFLAGS = --shared' and adding
	`MGNUCFLAGS = --pic-reg' to your Mmakefile
	[This should give you a dynamically linked executable
	that uses shared libraries.]

and let us know if these solve the problem.

If (1) solves your problem, then you might want to try the attached
patch out.  (cd scripts; patch < ml.in.patch; mmake install)
This patch would make static linking the default for FreeBSD too.

P.S.
In the version of README.Linux that shipped with Mercury 0.8 and 0.8.1,
there was a small mistake in README.Linux: where it says
`--mercury-libs shared', it should have said `--shared'.
(This only makes a difference if you are creating your own libraries.)

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3        |     -- the last words of T. S. Garp.
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