Subject: Re: [bug#64504] [PATCH] gnu: Add unsio.

From: Andreas Enge <[email-masked]>
Date: Tue, 8 Aug 2023 17:49:50 +0200

Am Tue, Aug 08, 2023 at 01:37:14PM +0200 schrieb Iliya Tikhonenko:
> On 8/8/23 11:29, Andreas Enge wrote:
> > For the #:build-type, the default value (release with debug information) also works and results in a package of the same size. Is there a reason to change it? Modified patch attached.
> The debug build type is unnecessary verbose (see src/uns.cc line 71-73 for
> an example) to the point that it impacts performance sometimes, which is
> important considering the usecase of the library.

Okay, I have reinstated your line and added a comment.
 
> > I can also compile the package without the configure flags, are they useful?
> Checked again, I still cannot compile it without -DCMAKE_CXX_STANDARD=14

I can... Patch attached.

> > And there are lots of warnings about 34 bit shifts in a 32 bit type.
> > But I suppose you tested that the library works.
> I have not noticed any issues using it during the past two years, but this
> cannot be considered a proper test because I am actually using a small
> subset of the library. Perhaps, this warning should be reported upstream,
> thanks!

/tmp/guix-build-unsio-1.3.3-0.25e5246.drv-0/source/src/snapshotinterface.cc:125:45: warning: result of ‘(-2147483648 << 2)’ requires 34 bits to represent, but ‘int’ only has 32 bits [-Wshift-overflow=]
  125 |       req_bits = (unsigned int) (( 1 << 31 )<<2)-1;
      |                                 ~~~~~~~~~~~~^~~~

Here is the offending line. This is indeed a bit surprising, as "int"
usually has 32 bits. The 1 to be shifted is a signed int; 1*2^31 is not
representable in the type, so if I understand the C standard correctly,
the result is undefined. Then I have seen a Stackoverflow comment that
it is okay in C++20. And indeed:
   #:configure-flags #~(list "-DCMAKE_CXX_STANDARD=20")
passes without these warnings. Should we add this?
Although such constructs look a bit brittle to me, and it is not
suggested by the author.

There is still the question about the lib64/ installation directory,
I think this should be changed.

Andreas

>From ebfdbb4941d1151d15ecc0efb5aacdd3532b30cb Mon Sep 17 00:00:00 2001
Message-ID: <[email-masked]>
From: Sharlatan Hellseher <[email-masked]>
Date: Thu, 6 Jul 2023 23:13:05 +0100
Subject: [PATCH] gnu: Add unsio.

* gnu/packages/astronomy.scm (unsio): New variable.

Co-Authored-By: Iliya Tikhonenko <[email-masked]>
Signed-off-by: Andreas Enge <[email-masked]>
---
 gnu/packages/astronomy.scm | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/gnu/packages/astronomy.scm b/gnu/packages/astronomy.scm
index e5c318c8bf..e18e8bb21e 100644
--- a/gnu/packages/astronomy.scm
+++ b/gnu/packages/astronomy.scm
@@ -9,6 +9,7 @@
 ;;; Copyright © 2021, 2022 Vinicius Monego <[email-masked]>
 ;;; Copyright © 2021 Greg Hogan <[email-masked]>
 ;;; Copyright © 2021 Foo Chuan Wei <[email-masked]>
+;;; Copyright © 2023 Iliya Tikhonenko <[email-masked]>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -75,6 +76,7 @@ (define-module (gnu packages astronomy)
   #:use-module (gnu packages python-xyz)
   #:use-module (gnu packages qt)
   #:use-module (gnu packages readline)
+  #:use-module (gnu packages sqlite)
   #:use-module (gnu packages sphinx)
   #:use-module (gnu packages textutils)
   #:use-module (gnu packages time)
@@ -3951,3 +3953,32 @@ (define-public python-wiimatch
 for optimal @code{matching} of weighted N-dimensional image intensity data
 using (multivariate) polynomials.")
     (license license:bsd-3)))
+
+(define-public unsio
+  ;; There is no versioned tag, use the latest commit.
+  (let ((commit "25e52468298e1194c9726ef5dba9d5fbb46870f5")
+        (revision "0"))
+    (package
+      (name "unsio")
+      (version (git-version "1.3.3" revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://gitlab.lam.fr/infrastructure/unsio")
+                      (commit commit)))
+                (file-name (git-file-name name version))
+                (sha256
+                 (base32
+                  "110i2p5608zhh5w3pf3b5r2651hykw2ayspgq6vpqsffhya1p170"))))
+      (build-system cmake-build-system)
+      (arguments
+       (list #:tests? #f ;No tests
+             #:build-type "Release")) ; to improve performace
+      (inputs (list gfortran hdf5 perl sqlite zlib))
+      (home-page "https://projets.lam.fr/projects/unsio/wiki")
+      (synopsis "Input and output routines for n-body file formats")
+      (description
+       "@acronym{UNSIO, Universal Nbody Snapshot Input Output} provides
+an API for performing input and output operations on different kinds of
+n-body file formats (nemo, Gadget binaries 1 and 2, Gadget hdf5, Ramses).")
+      (license license:cecill))))

base-commit: 782ef67a59f4b564f16101cf23c30a3777b3f734
-- 
2.41.0