[Bug go/46986] Go is not supported on Darwin

["comexk at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46986

comexk at gmail dot com changed:

           What    |Removed                     |Added
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                 CC|                            |comexk at gmail dot com

--- Comment #3 from comexk at gmail dot com 2011-02-26 23:25:36 UTC ---
I was able to get gcc to compile, and compile and run a trivial Go program on
OS X with the attached patch.  Since I know little about gcc, the patch is just
a hack, but maybe it can help.

The issues it addresses are:

- some of the stuff that mksysinfo.sh generates doesn't compile.

- The frontend hardcodes ".go_export" both in the C++ code and in the argument
to objcopy, but Darwin wants both a segment and section name.

- A lot of code relies on asm() for symbol names, but Darwin wants an
underscore at the beginning (hardcode the underscore; obviously not a good
plan).

- SIGRTMIN is not defined (use SIGUSR1/2).

- xnu doesn't support sem_init() (use pthreads).

- the compiler seems to want an explicit -o with -c, but compiler_c_o in
libtool somehow gets defined as no.

- syscall.Sysctl isn't defined (I didn't bother to fix this but just commented
out the only use).

- a typo in libgo/runtime/go-new-map.c which is probably unrelated and belongs
in another bug.

GCC version: gcc-4.6-20110219 
System: Mac OS X 10.6.6 (with MacPorts installed)
Configuration: ./configure --prefix=/opt/gccgo
--with-boot-ldflags="/opt/local/lib/libiconv.dylib /usr/lib/libiconv.dylib"
--disable-bootstrap --with-ppl=/opt/local --with-cloog=/opt/local
--with-mpfr=/opt/local --enable-gold=no --enable-ld=no
--enable-languages=c,c++,go LDFLAGS="/opt/local/lib/libiconv.dylib
/usr/lib/libiconv.dylib"