x11-libs/gtk-fortran: add new package

The gtk-fortran project aims to offer scientists programming in Fortran
a cross-platform library to build Graphical User Interfaces (GUI).
Gtk-fortran is a partial GTK / Fortran binding 100% written in Fortran,
thanks to the ISO_C_BINDING module for interoperability between C
and Fortran, which is a part of the Fortran 2003 standard.

Signed-off-by: Sergey Torokhov <torokhov-s-a@yandex.ru>

x11-libs/gtk-fortran/Manifest

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+DIST gtk-fortran-3.24.8.tar.gz 4164311 BLAKE2B 728d55890344894df534de1530135933e488ea197dc2d9b8f28571ce56a236e7fe2be23ebc4708e1ae5ffeb10e4ee584db366945e3d262225c4e9f7db4fa611d SHA512 58154df7c531ebfabcc687f8f38d3c7db7f7adb6cc015e1ce9c44455ab2506a4dfe6b073a88100131ac3712fee68844e4544f2f77d954285e3fbc86e1b3d9394

x11-libs/gtk-fortran/gtk-fortran-3.24.8.ebuild

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+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+CMAKE_MAKEFILE_GENERATOR="emake"
+FORTRAN_STANDARD=2003
+
+inherit cmake flag-o-matic fortran-2
+
+DESCRIPTION="A GTK+ binding to build Graphical User Interfaces in Fortran"
+HOMEPAGE="https://github.com/vmagnin/gtk-fortran"
+SRC_URI="https://github.com/vmagnin/${PN}/archive/v19.04.gtk${PV}.tar.gz -> ${P}.tar.gz"
+
+S="${WORKDIR}/${PN}-19.04.gtk${PV}"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+IUSE="doc examples plplot"
+
+RDEPEND="
+	x11-libs/gtk+:3
+	plplot? ( >=sci-libs/plplot-5.13.0[cairo,fortran] )
+"
+
+DEPEND="
+	${RDEPEND}
+	doc? ( app-doc/doxygen[dot] )
+"
+
+BDEPEND="
+	virtual/fortran
+	virtual/pkgconfig
+"
+
+pkg_setup() {
+	fortran-2_pkg_setup
+}
+
+src_prepare() {
+	default
+	# Fix library installation path
+	sed -i "s:CMAKE_INSTALL_LIBDIR lib:CMAKE_INSTALL_LIBDIR $(get_libdir):" CMakeLists.txt || die
+	# Fix "Some or all of the gtk libraries were not found. (missing: GTK3_GDKCONFIG_INCLUDE_DIR)",
+	# ref: https://github.com/vmagnin/gtk-fortran/commit/d3c1682
+	sed -i "s:GTK3_GDKCONFIG gdkconfig.h:GTK3_GDKCONFIG gdk/gdkconfig.h:" cmake/FindGTK3.cmake || die
+
+	cmake_src_prepare
+}
+
+src_configure() {
+	mycmakeargs+=(
+		-DEXCLUDE_PLPLOT=$(usex plplot false true)
+		-DINSTALL_EXAMPLES=$(usex examples)
+		-DNO_BUILD_EXAMPLES=true
+	)
+	# Try to fix (fix similar warnings only for static library):
+	# /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../x86_64-pc-linux-gnu/bin/ld: CMakeFiles/gtk-fortran_object.dir/gtk-hl-assistant.f90.o:
+	# warning: relocation against `hl_gtk_assistant_destroy' in read-only section `.rodata'
+	# /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../x86_64-pc-linux-gnu/bin/ld: warning: creating a DT_TEXTREL in object
+	append-flags -no-pie
+	cmake_src_configure
+}
+
+src_compile() {
+	cmake_src_compile
+	use doc && cmake_src_compile doxygen
+}
+
+src_install() {
+	cmake_src_install
+	use doc && dodoc -r ${BUILD_DIR}/html && rm ${D}/usr/share/doc/${P}/html/{*.map,*.md5}
+}

x11-libs/gtk-fortran/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+<maintainer type="person">
+	<email>torokhov-s-a@yandex.ru</email>
+	<name>Sergey Torokhov</name>
+</maintainer>
+<longdescription>
+	Gtk-fortran is a partial GTK/Fortran binding aims to offer scientists programming in Fortran
+	a cross-platform library to build Graphical User Interfaces.
+</longdescription>
+<use>
+	<flag name="doc">Build doxygen documentation</flag>
+	<flag name="examples">Install examples source code files</flag>
+	<flag name="plplot">Build with <pkg>sci-libs/plplot</pkg> support</flag>
+</use>
+</pkgmetadata>