Re: ping #3: [RFA] Add --with-libz-prefix option in config/zlib.m4

["H.J. Lu" <hjl.tools@gmail.com>]

On Wed, Feb 18, 2015 at 8:54 AM, Mike Frysinger <vapier@gentoo.org> wrote:
> On 18 Feb 2015 04:56, H.J. Lu wrote:
>> On Wed, Feb 18, 2015 at 4:08 AM, Joel Brobecker <brobecker@adacore.com> wrote:
>> > On Wed, Jan 07, 2015 at 06:45:48PM +0400, Joel Brobecker wrote:
>> >> This patch enhances config/zlib.m4 to introduce an extra option
>> >> --with-libz-prefix which allows us to provide the location of
>> >> the zlib library we want to use during the build.
>> >>
>> >> config/ChangeLog:
>> >>
>> >>         * zlib.m4 (AM_ZLIB): Add --with-libz-prefix option support.
>> >>
>> >> I didn't see any file in the GCC project that uses this macro,
>> >> so for the GCC repository, the change to zlib.m4 is it. But
>> >> I am also attaching to this email a copy of the patch that
>> >> will be applied to the binutils-gdb.git repository, with all
>> >> configury using this macro being re-generated - mostly for info,
>> >> also as a heads-up to both binutils and GDB.
>> >>
>> >> This was tested by regenerating all autoconf/automake files in
>> >> the binutils-gdb project, and rebuilding GDB, using the following
>> >> combinations:
>> >>
>> >>   --with-zlib (system zlib used)
>> >>   --with-libz-prefix=/zlib/prefix (specific zlib linked in)
>> >>   --with-zlib --with-libz-prefix=/zlib/prefix (specific zlib linked in)
>> >>
>> >>   --without-zlib (zlib support turned off)
>> >>   --without-zlib --with-zlib-prefix (zlib support turned off)
>> >>
>> >>   --with-zlib (no system zlib available, configure fails with expected error)
>> >>   --with-zlib --with-libz-prefix=/invalid/zlib/prefix
>> >>               (no system zlib, configure fails with same error)
>> >>
>> >> OK to commit?
>>
>> Why do you want to turn off zlib? On Linux/x86,  zlib is required
>> for assembler.  At least, you should issue an error when --without-libz
>> is used in binutils for Linux/x86 target.
>
> err, when did that happen ?  why would zlib be possibly required for an
> assembler ?
> -mike

commit 89e7505fcde4bd83948f559f429a0e1eb4262f05
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Dec 14 06:41:03 2014 -0800

    Compress debug sections for Linux/x86 by default

      * config/tc-i386.c (flag_compress_debug): Default to compress
      debug sections for Linux.


-- 
H.J.