likewise, 32bit OS X seems to be broken on HEAD too

http://lpaste.net/112412 is the relevant bit
make[5]: Nothing to be done for `all'.
depbase=`echo src/x86/win32.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\
	/bin/sh ./libtool    --mode=compile gcc-4.9 -DHAVE_CONFIG_H -I. -I..  -I. -I../include -Iinclude -I../src  -I. -I../include -Iinclude -I../src -U__i686 -m32 -fno-stack-protector -w -MT src/x86/win32.lo -MMD -MP -MF $depbase.Tpo -c -o src/x86/win32.lo ../src/x86/win32.S &&\
	mv -f $depbase.Tpo $depbase.Plo
libtool: compile:  gcc-4.9 -DHAVE_CONFIG_H -I. -I.. -I. -I../include -Iinclude -I../src -I. -I../include -Iinclude -I../src -U__i686 -m32 -fno-stack-protector -w -MT src/x86/win32.lo -MMD -MP -MF src/x86/.deps/win32.Tpo -c ../src/x86/win32.S  -fno-common -DPIC -o src/x86/.libs/win32.o
../src/x86/win32.S:1283:section difference relocatable subtraction expression, ".LFE5" minus ".LFB5" using a symbol at the end of section will not produce an assembly time constant
../src/x86/win32.S:1283:use a symbol with a constant value created with an assignment instead of the expression, L_const_sym = .LFE5 - .LFB5
../src/x86/win32.S:1275:section difference relocatable subtraction expression, ".LEFDE5" minus ".LASFDE5" using a symbol at the end of section will not produce an assembly time constant
../src/x86/win32.S:1275:use a symbol with a constant value created with an assignment instead of the expression, L_const_sym = .LEFDE5 - .LASFDE5
../src/x86/win32.S:unknown:missing indirect symbols for section (__IMPORT,__jump_table)
make[5]: *** [src/x86/win32.lo] Error 1

On Fri, Oct 10, 2014 at 9:40 AM, Páli Gábor János <pali.gabor@gmail.com> wrote:
2014-10-10 13:30 GMT+02:00 cg <chengang31@gmail.com>:
> How can I configure to build x86_64?
>
> When I build GHC (with msys2), it always builds i386 and I haven't spotted
> the option in ./configure to choose a x86_64 release.

This is implicitly determined by the toolchain you use.  So, probably
you have the i686 msys2 installed, while you would need the x86_64
version.  Given, that your operating system (and thus your hardware)
is also x86_64.
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