Date: Sat, 30 Mar 2019 05:11:07 +0000 (UTC) From: Paul Pathiakis <pathiaki2@yahoo.com> To: freebsd-questions@freebsd.org, Mayuresh Kathe <mayuresh@kathe.in> Subject: Re: Why very little documentation on "ifunc"? Message-ID: <1393052012.13903125.1553922667456@mail.yahoo.com> In-Reply-To: <dd8f36db22c27bfd2cbdf1d406099bfa@kathe.in> References: <dd8f36db22c27bfd2cbdf1d406099bfa@kathe.in>
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Hi,
Simply put, it's part of the GNU tool chain.=C2=A0 Most (if not all) of Fre=
eBSD's user space is POSIX compliant and a lot of things that are no longer=
'optimal' have been rewritten to be more efficient.=C2=A0 As time went on,=
it seemed to me that most everything GNU was getting well, slower and larg=
er.... and 'extended' beyond POSIX.=C2=A0 Added functionality is nice at ti=
mes, but when you expect something to work in a certain way and someone has=
added features or written something in BASH and made use of those extensio=
ns, well, it will only run under BASH.=C2=A0 However, anything written to c=
omply with a 'standard' such as 'sh' scripting, will run on anything with s=
h as well as bash.
Extending functionality makes things non-compliant with the standard.=C2=A0=
Examples of this in the past was Microsoft adding their extensions to JAVA=
which made it incompatible with all other standards compliant versions of =
Java.
Another example would be the Oracle Database SQL and/or MS SQL versus the P=
OSIX compliant DB known as PostGreSQL.=C2=A0 Anything that runs on PostGreS=
QL will run under the others (well, pretty much) but the reverse is not tru=
e especially if the are proprietary extensions.
More examples would be gawk vs awk, gsed vs sed, etc.=C2=A0 The ability to =
move in both directions is no longer true.=20
With the advent of putting in LLVM CLANG compiler, most of the GNU toolcha=
in has been put in the GCC port.=C2=A0 Now, since it is a port, a lot of 'p=
orts' and their pkg counterparts are just templated to fit into the the /us=
r/local/ hierarchy along with modifying some simple files for start/stop ma=
nipulation.=C2=A0 This includes all of the man pages that are not written b=
y FreeBSD but by the people who created the software.... for example a lot =
of the GNU utilities have man pages that just aren't as well-written as the=
constantly reviewed man pages on FreeBSD.
Although people can be enthusiastic about writing something that they want =
the world to see, the FreeBSD project seems to be excited about churning ou=
t a good product that in all aspects exceeds most peoples expectations.=C2=
=A0 No one is scared to run a x.0 release from FreeBSD.=C2=A0 It's due to a=
n ongoing QA and Release process and the simple ability to not push out cra=
p code to meet some artificial deadline.=C2=A0 However, other OS or even ju=
st kernels from other projects scare the heck out of people on release.=C2=
=A0 The amount of bugs, exploits, etc.... are an order of magnitude or more=
.... and no, it's not because no one uses it.... If you look at who is basi=
ng their products on FreeBSD, it's pretty obvious that they are 'The Unknow=
n Giant' of operating systems.
P.
On Friday, March 29, 2019, 11:00:55 PM EDT, Mayuresh Kathe <mayuresh@ka=
the.in> wrote: =20
=20
Ever since I stumbled upon "ifunc" I have been unable to find good=20
enough documentation regarding it under FreeBSD, that was till "Ed=20
Maste" pointed out;=20
https://jasoncc.github.io/gnu_gcc_glibc/gnu-ifunc.html
"ifunc" seems to be a really good tool, wonder why it isn't as well=20
documented as rest of the stuff under FreeBSD.
~Mayuresh
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Date: Sat, 30 Mar 2019 04:29:40 +0100
From: Polytropon <freebsd@edvax.de>
To: mayuresh@kathe.in
Cc: freebsd-questions@freebsd.org
Subject: Re: Why very little documentation on "ifunc"?
Message-Id: <20190330042940.ed91d5f6.freebsd@edvax.de>
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On Sat, 30 Mar 2019 07:28:23 +0530, Mayuresh Kathe wrote:
> Ever since I stumbled upon "ifunc" I have been unable to find good
> enough documentation regarding it under FreeBSD, that was till "Ed
> Maste" pointed out;
> https://jasoncc.github.io/gnu_gcc_glibc/gnu-ifunc.html
>
> "ifunc" seems to be a really good tool, wonder why it isn't as well
> documented as rest of the stuff under FreeBSD.
>From what I see, ifunc is part of GCC, and FreeBSD does no longer
use GCC as the system compiler (after switching to Clang/LLVM).
The case for ifunc documentation therefore has to be discussed
primarily in the context of GNU development tools.
https://sourceware.org/glibc/wiki/GNU_IFUNC
Of course, Clang/LLVM also has (limited) support for it:
https://clang.llvm.org/docs/AttributeReference.html#ifunc
So this is nothing FreeBSD-specific which should be covered by
OS documentation in the first place. But it could maybe find a
place in the FreeBSD Porter's Handbook.
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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