[Seqan-dev] Fwd: Fwd: cmake default without -O3 and order of args/options in cmake call

[Hannes Hauswedell <hannes.hauswedell@fu-berlin.de>]

-------- Forwarded Message --------
Subject: Fwd: cmake default without -O3 and order of args/options in
cmake call
Date: Sun, 9 Aug 2020 18:03:47 +0200
From: Stefan Kurtz <kurtz@zbh.uni-hamburg.de>
Reply-To: kurtz@zbh.uni-hamburg.de
Organization: Universitaet Hamburg
To: eqan-dev-owner@lists.fu-berlin.de
CC: Hannes Hauswedell <hannes.hauswedell@fu-berlin.de>

As suggested on the seqan web pages I had send an E-mail to
eqan-dev@lists.fu-berlin.de, but
I received the following message:
---
Your message has been rejected, probably because you are not
subscribed to the mailing list and the list's policy is to prohibit
non-members from posting to it.  If you think that your messages are
being rejected in error, contact the mailing list owner at
seqan-dev-owner@lists.fu-berlin.de.
--

Please forward the message to the Seqan developers. Kind regards, Stefan
Kurtz


-------- Forwarded Message --------
Reply-To: kurtz@zbh.uni-hamburg.de
To: seqan-dev@lists.fu-berlin.de
From: Stefan Kurtz <kurtz@zbh.uni-hamburg.de>
Subject: cmake default without -O3 and order of args/options in cmake call
Organization: Universitaet Hamburg
Message-ID: <cb4e36e9-814a-db1e-461a-c853efcc4300@zbh.uni-hamburg.de>
Date: Sun, 9 Aug 2020 17:56:49 +0200
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Dear Seqan3-developers,

this email refers to the 'Quick Setup (Cmake)' section of SeqAn3  3.0.2.

1) I followed the description for the Cmake-setup and noticed in the
example CMakeList.txt
shown at the end of https://docs.seqan.de/seqan/3-master-user/setup.html
that compiler optimization options such as -O3 is missing, which will
lead to poor performance for users who do not recognize it.
I know use
add_compile_options(-DNDEBUG -Wall -Wextra -Wunused-parameter
-Wunused-variable -pedantic -Werror -O3)

in CmakeLists.txt.

2) The cmake-setup specifies that one has to call
     cmake ../source -DCMAKE_CXX_COMPILER=/path/to/executable/g++-7

     The help pages of cmake version 3.16.3 on macOS and
     cmake version 3.10.2 on Linux state that options come before
arguments, but only the macOS version enforces this. So on my
     macOS system only
      cmake  -DCMAKE_CXX_COMPILER=/path/to/executable/g++-7 ../source
     works. To simplify the use for macOS, it is probably better
     use this order in the cmake-setup section (and elsewhere) which
works on both platforms.

Kind regards, Stefan Kurtz

-- 
Prof. Dr. Stefan Kurtz
Zentrum fuer Bioinformatik
Universitaet Hamburg
Bundesstrasse 43
20146 Hamburg
Germany

Email:  kurtz@zbh.uni-hamburg.de
URL:    http://www.zbh.uni-hamburg.de/kurtz
Phone:  +49 (40) 42838 7311
FAX:    +49 (40) 42838 7312