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[bug#40283] [WIP PATCH] gnu: flint: Build with ntl.

From: Jakub Kądziołka
Subject: [bug#40283] [WIP PATCH] gnu: flint: Build with ntl.
Date: Sun, 29 Mar 2020 22:32:24 +0200

* gnu/packages/algebra.scm (flint)[inputs]: Add ntl.
  [arguments]: Pass --with-ntl to configure.
This is required by sagemath, but the patch as written makes the build

 error: invalid conversion from ‘const NTL::Vec<NTL::ZZ>*’ to ‘int’ 
  201 | { VecStrategy<NTL_RELOC_TAG>::do_BlockConstructFromVec(p, n, q); }
      |                               ^~~~~~~~~~~~~~~~~~~~~~~~
      |                               |
      |                               const NTL::Vec<NTL::ZZ>*

Arch Linux seems to be using the same version of ntl and flint, and I
don't see any special workarounds in their PKGBUILDs. I guessed that the
gcc version might be influencing things, but adding gcc-9 to
native-inputs didn't help. Does Guix set up GCC with some non-standard
default flags, maybe?

 gnu/packages/algebra.scm | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/algebra.scm b/gnu/packages/algebra.scm
index af50c2d775..99b69eba96 100644
--- a/gnu/packages/algebra.scm
+++ b/gnu/packages/algebra.scm
@@ -445,6 +445,8 @@ or text interfaces) or as a C++ library.")
             (patches (search-patches "flint-ldconfig.patch"))))
    (build-system gnu-build-system)
+   (inputs
+    `(("ntl" ,ntl)))
     `(("gmp" ,gmp)
       ("mpfr" ,mpfr))) ; header files from both are included by flint/arith.h
@@ -456,13 +458,15 @@ or text interfaces) or as a C++ library.")
            (lambda* (#:key inputs outputs #:allow-other-keys)
              (let ((out (assoc-ref outputs "out"))
                    (gmp (assoc-ref inputs "gmp"))
-                   (mpfr (assoc-ref inputs "mpfr")))
+                   (mpfr (assoc-ref inputs "mpfr"))
+                   (ntl (assoc-ref inputs "ntl")))
                ;; do not pass "--enable-fast-install", which makes the
                ;; homebrew configure process fail
                (invoke "./configure"
                        (string-append "--prefix=" out)
                        (string-append "--with-gmp=" gmp)
-                       (string-append "--with-mpfr=" mpfr))
+                       (string-append "--with-mpfr=" mpfr)
+                       (string-append "--with-ntl=" ntl))
    (synopsis "Fast library for number theory")

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