dev-libs/mpc: remove 'mpfr_add_one_ulp' use, mpfr-4.0.0 fix part 2

It's a backport of https://scm.gforge.inria.fr/anonscm/gitweb?p=mpc/mpc.git;a=commitdiff;h=5eaa17651b759c7856a118835802fecbebcf46ad
("replace obsolete mpfr_add_one_ulp/mpfr_sub_one_ulp functions")

mpfr-4.0.0 does not provide those functions anymore.
Unfortunately 'mpc' does not fail to build against such
mpfr but links broken library. One of the hints is usage
of undeclared function:
    mpc-1.0.3/src/mpc-impl.h:63:29: warning: implicit declaration of function
    ‘mpfr_add_one_ulp’ [-Wimplicit-function-declaration]

Package-Manager: Portage-2.3.19, Repoman-2.3.6

2 files changed, 65 insertions, 0 deletions

diff --git a/dev-libs/mpc/files/mpc-1.0.3-no-ulp.patch b/dev-libs/mpc/files/mpc-1.0.3-no-ulp.patch
new file mode 100644
index 000000000000..445e94191030
--- /dev/null
+++ b/dev-libs/mpc/files/mpc-1.0.3-no-ulp.patch
@@ -0,0 +1,25 @@
+mpfr-4.0.0 removed 'mpfr_add_one_ulp' and 'mpfr_sub_one_ulp'
+
+From 5eaa17651b759c7856a118835802fecbebcf46ad Mon Sep 17 00:00:00 2001
+From: Paul Zimmermann <Paul.Zimmermann@inria.fr>
+Date: Wed, 4 Oct 2017 22:09:40 +0200
+Subject: [PATCH] replace obsolete mpfr_add_one_ulp/mpfr_sub_one_ulp functions
+
+---
+ src/mpc-impl.h | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/src/mpc-impl.h b/src/mpc-impl.h
+index 4026765..5420691 100644
+--- a/src/mpc-impl.h
++++ b/src/mpc-impl.h
+@@ -60,2 +60,4 @@ along with this program. If not, see http://www.gnu.org/licenses/ .
+-#define MPFR_ADD_ONE_ULP(x) mpfr_add_one_ulp (x, GMP_RNDN)
+-#define MPFR_SUB_ONE_ULP(x) mpfr_sub_one_ulp (x, GMP_RNDN)
++#define MPFR_ADD_ONE_ULP(x) \
++  (mpfr_sgn (x) > 0 ? mpfr_nextabove (x) : mpfr_nextbelow (x))
++#define MPFR_SUB_ONE_ULP(x) \
++  (mpfr_sgn (x) > 0 ? mpfr_nextbelow (x) : mpfr_nextabove (x))
+-- 
+2.15.1
+
diff --git a/dev-libs/mpc/mpc-1.0.3-r1.ebuild b/dev-libs/mpc/mpc-1.0.3-r1.ebuild
new file mode 100644
index 000000000000..c35082341337
--- /dev/null
+++ b/dev-libs/mpc/mpc-1.0.3-r1.ebuild
@@ -0,0 +1,40 @@
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit autotools eutils libtool multilib-minimal
+
+DESCRIPTION="A library for multiprecision complex arithmetic with exact rounding"
+HOMEPAGE="http://mpc.multiprecision.org/"
+SRC_URI="http://www.multiprecision.org/mpc/download/${P}.tar.gz"
+
+LICENSE="LGPL-2.1"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~ppc-aix ~x64-cygwin ~amd64-fbsd ~sparc-fbsd ~x86-fbsd ~amd64-linux ~arm-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~m68k-mint ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+IUSE="static-libs"
+
+DEPEND=">=dev-libs/gmp-4.3.2:0=[${MULTILIB_USEDEP},static-libs?]
+	>=dev-libs/mpfr-2.4.2:0=[${MULTILIB_USEDEP},static-libs?]"
+RDEPEND="${DEPEND}"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-mpfr-4.0.0.patch
+	"${FILESDIR}"/${P}-no-ulp.patch
+)
+
+src_prepare() {
+	default
+
+	eautoreconf
+	elibtoolize #347317
+}
+
+multilib_src_configure() {
+	ECONF_SOURCE=${S} econf $(use_enable static-libs static)
+}
+
+multilib_src_install_all() {
+	einstalldocs
+	prune_libtool_files
+}