[macports-ports] branch master updated: unpaper: Update to version 6.1 - Use recommended compile flags
ryandesign at macports.org
Sat Jan 20 08:15:16 UTC 2018
On Jan 20, 2018, at 01:54, Ryan Schmidt wrote:
> On Jan 12, 2018, at 12:54, Frank Schima wrote:
>> Frank Schima (mf2k) pushed a commit to branch master
>> in repository macports-ports.
>> The following commit(s) were added to refs/heads/master by this push:
>> new 05e7489 unpaper: Update to version 6.1 - Use recommended compile flags
>> 05e7489 is described below
>> commit 05e7489989c736d2397e10073b8e8edd628d1ac8
>> Author: Frank Schima
>> AuthorDate: Fri Jan 12 11:54:56 2018 -0700
>> unpaper: Update to version 6.1
>> - Use recommended compile flags
>> Fixes: https://trac.macports.org/ticket/55660
>> +configure.cflags-append -O2 -march=native -pipe -flto
> Why? Recommended by whom?
> -O2 is an optimization flag. If you want to set it, do so in configure.optflags. But an upstream recommendation is not a sufficient reason to me to change it.
> -march=native may cause the binaries produced by our buildbot to be incompatible with user system, if user systems are not using the same processor as our buildbot.
> -pipe is a flag MacPorts adds for you, if the user requested it in macports.conf setting; ports should not override it. The MacPorts default is enabled.
I see now that the project's README.md recommends using the above flags, only because "it is important to build with optimizations turned on". MacPorts builds with optimizations turned on by default, specifically -Os, so let's leave it at that.
> I don't know about -flto.
The README.md says "Even better, if your compiler supports it, is to use Link-Time Optimizations". So we can certainly use this for compilers that support it. Apparently recent clang does. I don't know about old clang. gcc-4.2 which we use on Snow Leopard and earlier does not.
So I would like to commit the attached (which also fixes #55725). Ok?
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