--- /dev/null
+From fa5ec96a94646492a3f908e12905b3e48a8e800b Mon Sep 17 00:00:00 2001
+From: Romain Naour <romain.naour@gmail.com>
+Date: Wed, 18 Apr 2018 20:24:13 +0200
+Subject: [PATCH] src/cpp: fix cmake >= 3.11 build
+
+CMake < 3.11 doesn't support add_library() without any source file
+(i.e add_library(foo SHARED)). But flann CMake use a trick that use
+an empty string "" as source list (i.e add_library(foo SHARED "")).
+This look like a bug in CMake < 3.11.
+
+With CMake >= 3.11, the new behaviour of add_library() break the
+existing flann CMake code.
+
+From CMake Changelog [1]:
+"add_library() and add_executable() commands can now be called without
+ any sources and will not complain as long as sources are added later
+ via the target_sources() command."
+
+Note: flann CMake code doesn't use target_sources() since no source file
+are provided intentionally since the flann shared library is created by
+linking with the flann_cpp_s static library with this line:
+
+target_link_libraries(flann_cpp -Wl,-whole-archive flann_cpp_s -Wl,-no-whole-archive)
+
+If you try to use "add_library(flann_cpp SHARED ${CPP_SOURCES})" (as it should
+be normally done), the link fail due to already defined symbol.
+
+They are building the shared version using the static library "to speedup the
+build time" [3]
+
+This issue is already reported upstream [2] with a proposed solution.
+
+Upstream status: Pending
+
+Fixes:
+http://autobuild.buildroot.net/results/b2f/b2febfaf8c44ce477b3e4a5b9b976fd25e8d7454
+
+[1] https://cmake.org/cmake/help/v3.11/release/3.11.html
+[2] https://github.com/mariusmuja/flann/issues/369
+[3] https://github.com/mariusmuja/flann/commit/0fd62b43be2fbb0b8d791ee36290791224dc030c
+
+Signed-off-by: Romain Naour <romain.naour@gmail.com>
+---
+ src/cpp/CMakeLists.txt | 4 ++--
+ src/cpp/empty.cpp | 1 +
+ 2 files changed, 3 insertions(+), 2 deletions(-)
+ create mode 100644 src/cpp/empty.cpp
+
+diff --git a/src/cpp/CMakeLists.txt b/src/cpp/CMakeLists.txt
+index b44a735..a816863 100644
+--- a/src/cpp/CMakeLists.txt
++++ b/src/cpp/CMakeLists.txt
+@@ -29,7 +29,7 @@ if (BUILD_CUDA_LIB)
+ endif()
+
+ if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND CMAKE_COMPILER_IS_GNUCC)
+- add_library(flann_cpp SHARED "")
++ add_library(flann_cpp SHARED "empty.cpp")
+ set_target_properties(flann_cpp PROPERTIES LINKER_LANGUAGE CXX)
+ target_link_libraries(flann_cpp -Wl,-whole-archive flann_cpp_s -Wl,-no-whole-archive)
+
+@@ -85,7 +85,7 @@ if (BUILD_C_BINDINGS)
+ set_property(TARGET flann_s PROPERTY COMPILE_DEFINITIONS FLANN_STATIC)
+
+ if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND CMAKE_COMPILER_IS_GNUCC)
+- add_library(flann SHARED "")
++ add_library(flann SHARED "empty.cpp")
+ set_target_properties(flann PROPERTIES LINKER_LANGUAGE CXX)
+ target_link_libraries(flann -Wl,-whole-archive flann_s -Wl,-no-whole-archive)
+ else()
+diff --git a/src/cpp/empty.cpp b/src/cpp/empty.cpp
+new file mode 100644
+index 0000000..40a8c17
+--- /dev/null
++++ b/src/cpp/empty.cpp
+@@ -0,0 +1 @@
++/* empty */
+--
+2.14.3
+
--- /dev/null
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit cmake-utils cuda flag-o-matic toolchain-funcs
+
+DESCRIPTION="Fast approximate nearest neighbor searches in high dimensional spaces"
+HOMEPAGE="http://www.cs.ubc.ca/research/flann/"
+SRC_URI="https://github.com/mariusmuja/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~amd64 ~arm ~ppc ~x86 ~amd64-linux ~x86-linux"
+IUSE="cuda doc examples mpi openmp octave static-libs"
+
+RDEPEND="
+ cuda? ( >=dev-util/nvidia-cuda-toolkit-5.5 )
+ mpi? (
+ sci-libs/hdf5[mpi]
+ dev-libs/boost:=[mpi]
+ )
+ !mpi? ( !sci-libs/hdf5[mpi] )
+ octave? ( >=sci-mathematics/octave-3.6.4-r1 )"
+DEPEND="${RDEPEND}
+ app-arch/unzip
+ doc? ( dev-tex/latex2html )"
+# TODO:
+# readd dependencies for test suite,
+# requires multiple ruby dependencies
+
+PATCHES=(
+ "${FILESDIR}"/flann-1.9.1-cmake-3.11.patch
+)
+
+pkg_pretend() {
+ [[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
+}
+
+pkg_setup() {
+ [[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
+}
+
+src_prepare() {
+ # bug #302621
+ use mpi && export CXX=mpicxx
+ # produce pure octave files
+ # octave gentoo installation for .m files respected
+ sed -i \
+ -e 's/--mex//' \
+ -e 's/\.mex/\.oct/' \
+ -e '/FILES/s/${MEX_FILE}//' \
+ -e 's:share/flann/octave:share/octave/site/m:' \
+ -e "/CUSTOM_TARGET/a\INSTALL(FILES \${MEX_FILE} DESTINATION libexec/octave/site/oct/${CHOST})" \
+ src/matlab/CMakeLists.txt || die
+ use cuda && cuda_src_prepare
+
+ cmake-utils_src_prepare
+}
+
+src_configure() {
+ append-cxxflags -std=c++11
+
+ # python bindings are split
+ # off into dev-python/pyflann
+ local mycmakeargs=(
+ -DBUILD_C_BINDINGS=ON
+ -DBUILD_PYTHON_BINDINGS=OFF
+ -DPYTHON_EXECUTABLE=
+ -DDOCDIR=share/doc/${PF}
+ -DBUILD_CUDA_LIB=$(usex cuda)
+ -DBUILD_EXAMPLES=$(usex examples)
+ -DBUILD_DOC=$(usex doc)
+ -DBUILD_TESTS=OFF
+ -DBUILD_MATLAB_BINDINGS=$(usex octave)
+ -DUSE_MPI=$(usex mpi)
+ -DUSE_OPENMP=$(usex openmp)
+ )
+ use cuda && mycmakeargs+=(
+ -DCUDA_NVCC_FLAGS="${NVCCFLAGS} --linker-options \"-arsch\""
+ )
+ cmake-utils_src_configure
+}
+
+src_install() {
+ cmake-utils_src_install
+ if ! use static-libs; then
+ find "${D}" -name 'lib*.a' -delete || die
+ fi
+}
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