sci-mathematics/sympow: new package for symmetric power L-functions.

This is an actively-maintained fork of Mark Watkins's original sympow
package (that is now impossible to find) by Debian's Jérôme Benoit.
Sympow is a dependency of SageMath, and SageMath will soon be able to
use the system's copy of sympow. Having this in Gentoo therefore avoids
pointless rebuilds of sympow for Gentoo users of SageMath.

Closes: https://bugs.gentoo.org/230449
Package-Manager: Portage-2.3.99, Repoman-2.3.22
Signed-off-by: Michael Orlitzky <mjo@gentoo.org>

5 files changed, 168 insertions, 0 deletions

diff --git a/sci-mathematics/sympow/Manifest b/sci-mathematics/sympow/Manifest
new file mode 100644
index 000000000000..791d59c9e963
--- /dev/null
+++ b/sci-mathematics/sympow/Manifest
@@ -0,0 +1 @@
+DIST sympow-v2.023.6.tar.gz 68142 BLAKE2B accff25cb1da5b6935a91179fa399d76148709be54bbd434c0dc6143e88e9cd0f0a3cd96c683da3214366a29d6d0dbb7236d2623ef3f9322b6d4d54c6bad9882 SHA512 efe3b09fff0629e136b029ea615aa09ac1a4f225c06636d653ac921c7de01bf75e2b392a138c3c1af92f2b4f889f5949beeeba5b6e5e6b49e02c605bb9c16ceb
diff --git a/sci-mathematics/sympow/files/sympow-2.023.6-dont-force-O3.patch b/sci-mathematics/sympow/files/sympow-2.023.6-dont-force-O3.patch
new file mode 100644
index 000000000000..ae4924d468e3
--- /dev/null
+++ b/sci-mathematics/sympow/files/sympow-2.023.6-dont-force-O3.patch
@@ -0,0 +1,53 @@
+From d5fd3ce4221705c59dc289f14f5aefc2f974ba41 Mon Sep 17 00:00:00 2001
+From: Michael Orlitzky <michael@orlitzky.com>
+Date: Thu, 14 May 2020 18:45:59 -0400
+Subject: [PATCH 1/1] Configure: don't force -O3 in CFLAGS.
+
+The build system already respects the user's CFLAGS. It should respect
+lower -O levels as well. This is a "requirement" on Gentoo.
+---
+ Configure | 9 +++------
+ 1 file changed, 3 insertions(+), 6 deletions(-)
+
+diff --git a/Configure b/Configure
+index 1ef9756..fd5555c 100755
+--- a/Configure
++++ b/Configure
+@@ -104,15 +104,12 @@ CFLAGS=''
+ # return 2 if we did not add $FLAG.
+ try_add_CFLAG()
+ {
+-    # We use -O3 here to really force generation of fused
+-    # multiply-add instructions and to keep floats as much as
+-    # possible in registers.
+     # We compile in the fpu.c which only does
+     # something if the macro x86 is defined.
+     local flag=$1                      # first argument:  C FLAG to test
+     local bypassfputest=${2:-nobypass} # second argument: whether or not bypass the numerical test (default: not)
+     local status=0
+-    if $CC $ORIGINALCFLAGS -Werror $CFLAGS -O3 $flag config/fpubits1.c config/fpubits2.c fpu.c -o config/fpubits 2>/dev/null; then
++    if $CC $ORIGINALCFLAGS -Werror $CFLAGS $flag config/fpubits1.c config/fpubits2.c fpu.c -o config/fpubits 2>/dev/null; then
+         # Compiled successfully, now run it
+         config/fpubits >/dev/null 2>/dev/null
+         status=$?
+@@ -166,7 +163,7 @@ for FLAG in '' '-ffloat-store' '-O0'; do
+ done
+ 
+ # Check the actual FPU precision with our new flags.
+-CC_ARGS="$ORIGINALCFLAGS -O3 $CFLAGS config/fpubits1.c config/fpubits2.c fpu.c -o config/fpubits"
++CC_ARGS="$ORIGINALCFLAGS $CFLAGS config/fpubits1.c config/fpubits2.c fpu.c -o config/fpubits"
+ $CC $CC_ARGS
+ if [ $? -ne 0 ]; then
+ echo >&2 "Error: the command below failed:"
+@@ -256,7 +253,7 @@ echo "CONFEXE = config/endiantuple config/fpubits" >> $FILE
+ ##
+ ##echo "DEFS = $DEFS" >> $FILE
+ 
+-OPT="-O3 ${CFLAGS}" && echo "OPT = $OPT" >> $FILE
++OPT="${CFLAGS}" && echo "OPT = $OPT" >> $FILE
+ 
+ echo "H2MFLAGS = \\" >> $FILE
+ echo "	--manual=\"SYMPOW package\" \\" >> $FILE
+-- 
+2.26.2
+
diff --git a/sci-mathematics/sympow/files/sympow-2.023.6-no-pkgdatafilesbindir-warnings.patch b/sci-mathematics/sympow/files/sympow-2.023.6-no-pkgdatafilesbindir-warnings.patch
new file mode 100644
index 000000000000..e3cbe823def7
--- /dev/null
+++ b/sci-mathematics/sympow/files/sympow-2.023.6-no-pkgdatafilesbindir-warnings.patch
@@ -0,0 +1,45 @@
+From cf182287eb4219b03e57352072449885e10543f3 Mon Sep 17 00:00:00 2001
+From: Michael Orlitzky <michael@orlitzky.com>
+Date: Fri, 15 May 2020 16:49:49 -0400
+Subject: [PATCH 1/1] main.c: hide pkgdatafilesbindir warnings behind VERBOSE
+ >= 2.
+
+The default "pkgdatafilesbindir" is something like /var/cache/sympow
+that will never be writable by unprivileged users (and cannot safely
+be made that way). There is already a fallback to $HOME in the code
+that works perfectly well, but by default sympow emits a warning when
+it realizes that it can't write to e.g. /var/cache/sympow on the first
+try. Since that's completely expected, we hide the warnings behind an
+additional level of verbosity (VERBOSE >= 2 instead of VERBOSE >= 1).
+---
+ main.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/main.c b/main.c
+index 1d018df..fecd7d1 100644
+--- a/main.c
++++ b/main.c
+@@ -136,17 +136,17 @@ static void prepare_main(char *argv0)
+  asprintf(&pkgdatafilesbindir,"%s/datafiles/"ENDIANTUPLE,pkgcachedir);
+  if (stat(pkgdatafilesbindir,&infodb)) {mode_t mask=umask(0);
+   if (mkdir(pkgdatafilesbindir,(S_IRWXU|S_IRWXG|S_IRWXO|S_ISVTX)))
+-	{if (VERBOSE>=1) fprintf(stderr,"**WARNING** failed to create data bin package cache folder %s\n",pkgdatafilesbindir);
++	{if (VERBOSE>=2) fprintf(stderr,"**WARNING** failed to create data bin package cache folder %s\n",pkgdatafilesbindir);
+    free(pkgdatafilesbindir); pkgdatafilesbindir=NULL;}
+   else
+   {stat(pkgdatafilesbindir,&infodb); pkgdatamode= infodb.st_mode & ~MASK;}
+ 	umask(mask);}
+  else
+  {if (!S_ISDIR(infodb.st_mode))
+-  {if (VERBOSE>=1) fprintf(stderr,"**WARNING** %s exists but is not a directory\n",pkgdatafilesbindir);
++  {if (VERBOSE>=2) fprintf(stderr,"**WARNING** %s exists but is not a directory\n",pkgdatafilesbindir);
+    free(pkgdatafilesbindir); pkgdatafilesbindir=NULL;}
+   else if (access(pkgdatafilesbindir,(R_OK|W_OK|X_OK)))
+-  {if (VERBOSE>=1) fprintf(stderr,"**WARNING** %s yields insufficient permissions\n",pkgdatafilesbindir);
++  {if (VERBOSE>=2) fprintf(stderr,"**WARNING** %s yields insufficient permissions\n",pkgdatafilesbindir);
+    free(pkgdatafilesbindir); pkgdatafilesbindir=NULL;}
+ 	else {pkgdatamode= infodb.st_mode & ~MASK;}}
+  asprintf(&datafilesdir,"%s/datafiles",cachedir);
+-- 
+2.26.2
+
diff --git a/sci-mathematics/sympow/metadata.xml b/sci-mathematics/sympow/metadata.xml
new file mode 100644
index 000000000000..a321d1a8e2a3
--- /dev/null
+++ b/sci-mathematics/sympow/metadata.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+  <maintainer type="person">
+    <email>mjo@gentoo.org</email>
+  </maintainer>
+  <!--
+      mjo: François maintained this package in the sage-on-gentoo overlay
+      long before I moved it into ::gentoo. You don't need an ACK from me
+      to merge his changes.
+  -->
+  <maintainer type="person">
+    <email>frp.bissey@gmail.com</email>
+    <name>François Bissey</name>
+  </maintainer>
+  <maintainer type="project">
+    <email>proxy-maint@gentoo.org</email>
+    <name>Proxy Maintainers</name>
+  </maintainer>
+
+  <upstream>
+    <remote-id type="gitlab">rezozer/forks/sympow</remote-id>
+  </upstream>
+</pkgmetadata>
diff --git a/sci-mathematics/sympow/sympow-2.023.6.ebuild b/sci-mathematics/sympow/sympow-2.023.6.ebuild
new file mode 100644
index 000000000000..4e5e5566a81b
--- /dev/null
+++ b/sci-mathematics/sympow/sympow-2.023.6.ebuild
@@ -0,0 +1,45 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit toolchain-funcs
+
+DESCRIPTION="Symmetric power elliptic curve L-functions"
+HOMEPAGE="https://gitlab.com/rezozer/forks/sympow/"
+SRC_URI="https://gitlab.com/rezozer/forks/sympow/-/archive/v${PV}/${PN}-v${PV}.tar.gz"
+S="${WORKDIR}/${PN}-v${PV}"
+
+LICENSE="Sympow-BSD"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE=""
+
+# Pari is used at build time to generate data.
+BDEPEND="sys-apps/help2man
+	sci-mathematics/pari"
+DEPEND=""
+RDEPEND="sci-mathematics/pari"
+
+PATCHES=(
+	"${FILESDIR}/${P}-dont-force-O3.patch"
+	"${FILESDIR}/${P}-no-pkgdatafilesbindir-warnings.patch"
+)
+
+DOCS=( HISTORY README.md )
+
+src_configure() {
+	export ADDBINPATH=yes
+	export PREFIX="${EPREFIX}/usr"
+
+	# This location still won't be writable, but we can at least add
+	# the EPREFIX that belongs there. Sympow uses $HOME/.sympow as a
+	# fallback (what we want) when its first attempt doesn't work.
+	export VARPREFIX="${EPREFIX}/var"
+
+	./Configure || die
+}
+
+src_compile() {
+	emake CC="$(tc-getCC)" all
+}