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 11:44 AM, Mike Frysinger <vapier@gentoo.org> wrote:
> On 18 Feb 2015 08:58, H.J. Lu wrote:
>> On Wed, Feb 18, 2015 at 8:54 AM, Mike Frysinger wrote:
>> > On 18 Feb 2015 04:56, H.J. Lu wrote:
>> >> On Wed, Feb 18, 2015 at 4:08 AM, Joel Brobecker 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 ?
>>
>> 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.
>
> i don't see how that justifies making it a hard requirement
> -mike

Can you elaborate?

-- 
H.J.