[PATCH] Add --enable-host-shared configuration option

[David Malcolm]

On Tue, 2013-10-15 at 10:29 -0600, Jeff Law wrote:
> On 10/09/13 18:25, David Malcolm wrote:
[...]

> Presumably other host libraries we depend on such as gmp, mpc, etc are 
> available in shared (or at least PIC) form as well?  Obviously these are 
> out of our source tree and largely out of our control, but I'm a bit 
> curious if there's other host libraries that may cause you headaches in 
> the future.

Yes, on this Fedora box:
$ file /usr/lib64/libgmp.so.10.0.2
/usr/lib64/libgmp.so.10.0.2: ELF 64-bit LSB shared object, x86-64,
version 1 (SYSV), dynamically linked,
BuildID[sha1]=0x6fb87c7b6e9aa56e4a09a3fbd496a9ee2dadbdc2, stripped

$ file /usr/lib64/libmpc.so.2.0.0 
/usr/lib64/libmpc.so.2.0.0: ELF 64-bit LSB shared object, x86-64,
version 1 (SYSV), dynamically linked,
BuildID[sha1]=0x7fb16b27ba6412301c4efab4b9c0c3a09bb3c95d, stripped

> This is fine with the install.texi changes Joseph wanted.

Thanks; I've committed the combined patch to trunk as r203632.

> zlib/
> 	* configure.ac: Add --enable-host-shared, setting up new
> > 	PICFLAG variable.
> > 	* Makefile.am: Add PICFLAG to libz_a_CFLAGS.
> > 	* Makefile.in: Regenerate.
> > 	* configure: Regenerate.
> 

Incidentally, on committing this I noticed that zlib/ChangeLog is from
upstream zlib.  The downstream changes to gcc appear to be being
recorded into zlib/ChangeLog.gcj (I assume due to historical accident)
so I added the zlib changelog entries here.  I hope that's OK.

Dave