building gmp-4.2.1 on OS X

[Diane Trout]

Hi,

I was trying to link guile 1.8.1 against gmp-4.2.1 on OS X and ran afoul
of OS X's picky linker.

ld: common symbols not allowed with MH_DYLIB output format with the
-multi_module option
/usr/local/lib/libgmp.a(mp_bpl.o) definition of common ___gmp_junk (size 16)
/usr/bin/libtool: internal link edit command failed

After some research it appears that in addition to fiddling with the
shared library type and -fno-common, you can also make the OS X linker
happier by initializing the global variable.

The following patch makes it possible to link to guile (and probably
other "-dynamiclib"s ) without odd OS X specific CFLAGS settings.

I'm currently using
$ ./configure --disable-shared --build=none-unknown-osx
to build gmp, and all the tests in make check pass (after this patch and
the gmp_x86check_workaround_apple_ld_bug patch)

Diane

--- gmp-4.2.1.orig/mp_bpl.c     2006-03-14 07:57:54.000000000 -0800
+++ gmp-4.2.1/mp_bpl.c  2007-04-08 13:35:25.000000000 -0700
@@ -23,5 +23,5 @@
 #include "gmp-impl.h"

 const int mp_bits_per_limb = BITS_PER_MP_LIMB;
 const int __gmp_0 = 0;
-int __gmp_junk;
+int __gmp_junk = 0;


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