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Re: [PATCH] Avoid invoking ranlib on libbackend.a

From: Andreas Schwab <schwab at linux-m68k dot org>
To: Patrick Palka <patrick at parcs dot ath dot cx>
Cc: Andrew Pinski <pinskia at gmail dot com>, Bernd Schmidt <bschmidt at redhat dot com>, Richard Biener <richard dot guenther at gmail dot com>, Segher Boessenkool <segher at kernel dot crashing dot org>, David Edelsohn <dje dot gcc at gmail dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Fri, 22 Jul 2016 18:16:01 +0200
Subject: Re: [PATCH] Avoid invoking ranlib on libbackend.a
Authentication-results: sourceware.org; auth=none
References: <CAGWvnykjLnNXrF8fGeXxsyUc_PsNW6Tqj03Bfjghs1Kdr+t96w@mail.gmail.com> <CA+C-WL8tMVH06ywKeMZgsGk2sYGFtJat+LT76C26OrDsO-tw_Q@mail.gmail.com> <CAGWvnykmGwi_j-oDeLBwLNL5BA+Uh=FOZT3JvH0-tOCi3DWSaA@mail.gmail.com> <alpine.DEB.2.20.13.1607172140000.1419@idea> <20160718113511.GA32392@gate.crashing.org> <20160718124406.GB14108@gate.crashing.org> <alpine.DEB.2.20.13.1607181905370.1419@idea> <CAFiYyc3YovUoQ=S73-Se7wXyOeML8HTzAr9g4Z7hCj_Qq-uVDg@mail.gmail.com> <f0063ae1-2712-ade9-b9c7-34722defe971@redhat.com> <alpine.DEB.2.20.13.1607201009280.1419@idea> <CA+=Sn1kExDd=6sGZ8GyzzK7CLqSh1hN+M1HHEsfywxYFRNGOUw@mail.gmail.com> <CA+C-WL9Y1EDKreiJTFVJfTPCa+UDCXNJwZrHkj1DLVktUH-gNg@mail.gmail.com> <CA+C-WL9oL=hsJHNvjg-rKtzvprsogjOMmAkjtEz30POcNYiwVw@mail.gmail.com>

Patrick Palka <patrick@parcs.ath.cx> writes:

> ... so it's weird that your build times are constant because building
> a thin archive is much faster than building a regular archive and
> using a thin archive should not make subsequent steps, like linking
> that archive, slower.  So overall build times should be lower.

Linking a thin archive requires opening each archive member as a file
instead of only reading within a single file.  This could add some
non-trivial overhead.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

References:
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: David Edelsohn
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Patrick Palka
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: David Edelsohn
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Patrick Palka
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Segher Boessenkool
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Segher Boessenkool
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Patrick Palka
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Richard Biener
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Bernd Schmidt
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Patrick Palka
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Andrew Pinski
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Patrick Palka
- Re: [PATCH] Avoid invoking ranlib on libbackend.a
  - From: Patrick Palka

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