sci-mathematics/fann: update EAPI 7 -> 8, other fixes

Patch out bundled GTest, fix install directory for pkg-config files

Closes: https://bugs.gentoo.org/951922
Closes: https://bugs.gentoo.org/863050
Signed-off-by: NHOrus <jy6x2b32pie9@yahoo.com>
Closes: https://github.com/gentoo/gentoo/pull/41260
Signed-off-by: Sam James <sam@gentoo.org>

sci-mathematics/fann/fann-9999.ebuild

@@ -1,17 +1,42 @@
-# Copyright 1999-2022 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-EAPI=7
+EAPI=8
 
 inherit cmake git-r3 toolchain-funcs
 
 DESCRIPTION="Fast Artificial Neural Network Library"
-HOMEPAGE="http://leenissen.dk/fann/wp/"
+HOMEPAGE="https://leenissen.dk"
 EGIT_REPO_URI="https://github.com/libfann/fann"
 
 LICENSE="LGPL-2.1"
 SLOT="0"
-IUSE="examples"
+IUSE="examples test"
+RESTRICT="!test? ( test )"
+
+BDEPEND="
+	test? ( dev-cpp/gtest )
+"
+
+PATCHES=(
+	"${FILESDIR}/${P}-cmake.patch"
+)
+
+src_prepare() {
+	cmake_src_prepare
+
+	if use !test; then
+		sed -i '/ADD_SUBDIRECTORY( tests )/d' CMakeLists.txt || die
+	fi
+}
+
+src_configure() {
+	local mycmakeargs=(
+		# https://bugs.gentoo.org/863050
+		-DPKGCONFIG_INSTALL_DIR="${EPREFIX}/$(get_libdir)/pkgconfig"
+	)
+	cmake_src_configure
+}
 
 src_test() {
 	cd examples || die 'fails to enter examples directory'

sci-mathematics/fann/files/fann-9999-cmake.patch

@@ -0,0 +1,23 @@
+Bump minimum CMake version to fix build with CMake 4
+Unbundle gtest
+https://bugs.gentoo.org/863050
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -38,7 +38,7 @@
+ 	  ENDIF()
+ 	ENDIF()
+ ELSE()
+-cmake_minimum_required (VERSION 2.8)
++cmake_minimum_required (VERSION 3.5)
+ 
+ if (NOT DEFINED CMAKE_BUILD_TYPE)
+     set (CMAKE_BUILD_TYPE Release CACHE STRING "Build type")
+@@ -161,8 +161,6 @@
+ 
+ ################# compile tests ################
+ 
+-ADD_SUBDIRECTORY( lib/googletest )
+-
+ if(COMPILER_SUPPORTS_CXX11)
+   ADD_SUBDIRECTORY( tests )
+ endif()