dev-libs/boost: add 1.80.0

Closes: https://bugs.gentoo.org/865527
Signed-off-by: David Seifert <soap@gentoo.org>

5 files changed, 571 insertions, 0 deletions

diff --git a/dev-libs/boost/Manifest b/dev-libs/boost/Manifest
index 7e0c56594141..ba3e5b485af8 100644
--- a/dev-libs/boost/Manifest
+++ b/dev-libs/boost/Manifest
@@ -1 +1,2 @@
 DIST boost_1_79_0.tar.bz2 113456811 BLAKE2B 61f47ca022e60745868e6bdd3b5c75603dd68d878e126dcbb73de5b40fc03c0eec8eede3ec304ece58050435ef2fc1ed7eb763773c20673f85e32bbf4d5f978a SHA512 70909e0561c213d10a1fdd692f9ae7b293d3cdc63e925bdc207da9e9bba6e86474341100e7ee5de6d94f9561196b1a3a1597055a7b7382babf8931131170a312
+DIST boost_1_80_0.tar.bz2 115869904 BLAKE2B 507e811be7659442c41bc2d99811bd02a236dc94932e1a7a8cf256243b479f2d2707819cd99e016a51c9dadc215713e803afdd9ea4c105af8d5d2d28d3d06a1f SHA512 829a95b463473d69ff79ea41799c68429bb79d3b2321fbdb71df079af237ab01de9ad7e9612d8783d925730acada010068d2d1aa856c34244ee5c0ece16f208f
diff --git a/dev-libs/boost/boost-1.80.0.ebuild b/dev-libs/boost/boost-1.80.0.ebuild
new file mode 100644
index 000000000000..712ad83f404a
--- /dev/null
+++ b/dev-libs/boost/boost-1.80.0.ebuild
@@ -0,0 +1,341 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{8..11} )
+
+inherit flag-o-matic multiprocessing python-r1 toolchain-funcs multilib-minimal
+
+MY_PV="$(ver_rs 1- _)"
+MAJOR_V="$(ver_cut 1-2)"
+
+DESCRIPTION="Boost Libraries for C++"
+HOMEPAGE="https://www.boost.org/"
+SRC_URI="https://boostorg.jfrog.io/artifactory/main/release/${PV}/source/boost_${MY_PV}.tar.bz2"
+S="${WORKDIR}/${PN}_${MY_PV}"
+
+LICENSE="Boost-1.0"
+SLOT="0/${PV}" # ${PV} instead ${MAJOR_V} due to bug 486122
+#KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris ~x86-winnt"
+IUSE="bzip2 context debug doc icu lzma +nls mpi numpy python tools zlib zstd"
+REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"
+# the tests will never fail because these are not intended as sanity
+# tests at all. They are more a way for upstream to check their own code
+# on new compilers. Since they would either be completely unreliable
+# (failing for no good reason) or completely useless (never failing)
+# there is no point in having them in the ebuild to begin with.
+RESTRICT="test"
+
+RDEPEND="
+	!<dev-libs/leatherman-1.12.0-r1
+	bzip2? ( app-arch/bzip2:=[${MULTILIB_USEDEP}] )
+	icu? ( >=dev-libs/icu-3.6:=[${MULTILIB_USEDEP}] )
+	!icu? ( virtual/libiconv[${MULTILIB_USEDEP}] )
+	lzma? ( app-arch/xz-utils:=[${MULTILIB_USEDEP}] )
+	mpi? ( >=virtual/mpi-2.0-r4[${MULTILIB_USEDEP},cxx,threads] )
+	python? (
+		${PYTHON_DEPS}
+		numpy? ( dev-python/numpy[${PYTHON_USEDEP}] )
+	)
+	zlib? ( sys-libs/zlib:=[${MULTILIB_USEDEP}] )
+	zstd? ( app-arch/zstd:=[${MULTILIB_USEDEP}] )"
+DEPEND="${RDEPEND}"
+BDEPEND=">=dev-util/boost-build-${MAJOR_V}"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.80.0-disable_icu_rpath.patch
+	"${FILESDIR}"/${PN}-1.79.0-context-x32.patch
+	"${FILESDIR}"/${PN}-1.79.0-build-auto_index-tool.patch
+	# Boost.MPI's __init__.py doesn't work on Py3
+	"${FILESDIR}"/${PN}-1.79.0-boost-mpi-python-PEP-328.patch
+	"${FILESDIR}"/${PN}-1.80.0-fix-mips1-transition.patch
+	# (upstreamed)
+	"${FILESDIR}"/${PN}-1.80.0-unordered-fix.patch
+)
+
+python_bindings_needed() {
+	multilib_is_native_abi && use python
+}
+
+tools_needed() {
+	multilib_is_native_abi && use tools
+}
+
+create_user-config.jam() {
+	local user_config_jam="${BUILD_DIR}"/user-config.jam
+	if [[ -s ${user_config_jam} ]]; then
+		einfo "${user_config_jam} already exists, skipping configuration"
+		return
+	else
+		einfo "Creating configuration in ${user_config_jam}"
+	fi
+
+	local compiler compiler_version compiler_executable="$(tc-getCXX)"
+	if [[ ${CHOST} == *-darwin* ]]; then
+		compiler="darwin"
+		compiler_version="$(gcc-fullversion)"
+	else
+		compiler="gcc"
+		compiler_version="$(gcc-version)"
+	fi
+
+	if use mpi; then
+		local mpi_configuration="using mpi ;"
+	fi
+
+	cat > "${user_config_jam}" <<- __EOF__ || die
+		using ${compiler} : ${compiler_version} : ${compiler_executable} : <cflags>"${CFLAGS}" <cxxflags>"${CXXFLAGS}" <linkflags>"${LDFLAGS}" <archiver>"$(tc-getAR)" <ranlib>"$(tc-getRANLIB)" ;
+		${mpi_configuration}
+	__EOF__
+
+	if python_bindings_needed; then
+		append_to_user_config() {
+			local py_config
+			if tc-is-cross-compiler; then
+				py_config="using python : ${EPYTHON#python} : : ${ESYSROOT}/usr/include/${EPYTHON} : ${ESYSROOT}/usr/$(get_libdir) ;"
+			else
+				py_config="using python : ${EPYTHON#python} : ${PYTHON} : $(python_get_includedir) ;"
+			fi
+			echo "${py_config}" >> "${user_config_jam}" || die
+		}
+		python_foreach_impl append_to_user_config
+	fi
+
+	if python_bindings_needed && use numpy; then
+		einfo "Enabling support for NumPy extensions in Boost.Python"
+	else
+		einfo "Disabling support for NumPy extensions in Boost.Python"
+
+		# Boost.Build does not allow for disabling of numpy
+		# extensions, thereby leading to automagic numpy
+		# https://github.com/boostorg/python/issues/111#issuecomment-280447482
+		sed \
+			-e 's/\[ unless \[ python\.numpy \] : <build>no \]/<build>no/g' \
+			-i "${BUILD_DIR}"/libs/python/build/Jamfile || die
+	fi
+}
+
+pkg_setup() {
+	# Bail out on unsupported build configuration, bug #456792
+	if [[ -f "${EROOT}"/etc/site-config.jam ]]; then
+		if ! grep -q 'gentoo\(debug\|release\)' "${EROOT}"/etc/site-config.jam; then
+			eerror "You are using custom ${EROOT}/etc/site-config.jam without defined gentoorelease/gentoodebug targets."
+			eerror "Boost can not be built in such configuration."
+			eerror "Please, either remove this file or add targets from ${EROOT}/usr/share/boost-build/site-config.jam to it."
+			die "Unsupported target in ${EROOT}/etc/site-config.jam"
+		fi
+	fi
+}
+
+src_prepare() {
+	default
+	multilib_copy_sources
+}
+
+ejam() {
+	create_user-config.jam
+
+	local b2_opts=( "--user-config=${BUILD_DIR}/user-config.jam" )
+	if python_bindings_needed; then
+		append_to_b2_opts() {
+			b2_opts+=( python="${EPYTHON#python}" )
+		}
+		python_foreach_impl append_to_b2_opts
+	else
+		b2_opts+=( --without-python )
+	fi
+	b2_opts+=( "$@" )
+
+	echo b2 "${b2_opts[@]}" >&2
+	b2 "${b2_opts[@]}"
+}
+
+src_configure() {
+	# Workaround for too many parallel processes requested, bug #506064
+	[[ "$(makeopts_jobs)" -gt 64 ]] && MAKEOPTS="${MAKEOPTS} -j64"
+
+	# We don't want to end up with -L/usr/lib on our linker lines
+	# which then gives us lots of
+	#   skipping incompatible /usr/lib/libc.a when searching for -lc
+	# warnings
+	[[ -n ${ESYSROOT} ]] && local icuarg="-sICU_PATH=${ESYSROOT}/usr"
+
+	OPTIONS=(
+		$(usex debug gentoodebug gentoorelease)
+		"-j$(makeopts_jobs)"
+		-q
+		-d+2
+		pch=off
+		$(usex icu "${icuarg}" '--disable-icu boost.locale.icu=off')
+		$(usev !mpi --without-mpi)
+		$(usev !nls --without-locale)
+		$(usev !context '--without-context --without-coroutine --without-fiber')
+		--without-stacktrace
+		--boost-build="${BROOT}"/usr/share/b2/src
+		--layout=system
+		# building with threading=single is currently not possible
+		# https://svn.boost.org/trac/boost/ticket/7105
+		threading=multi
+		link=shared
+		# this seems to be the only way to disable compression algorithms
+		# https://www.boost.org/doc/libs/1_70_0/libs/iostreams/doc/installation.html#boost-build
+		-sNO_BZIP2=$(usex bzip2 0 1)
+		-sNO_LZMA=$(usex lzma 0 1)
+		-sNO_ZLIB=$(usex zlib 0 1)
+		-sNO_ZSTD=$(usex zstd 0 1)
+	)
+
+	if [[ ${CHOST} == *-darwin* ]]; then
+		# We need to add the prefix, and in two cases this exceeds, so prepare
+		# for the largest possible space allocation.
+		append-ldflags -Wl,-headerpad_max_install_names
+	fi
+
+	# Use C++17 globally as of 1.80
+	append-cxxflags -std=c++17
+}
+
+multilib_src_compile() {
+	ejam \
+		--prefix="${EPREFIX}"/usr \
+		"${OPTIONS[@]}" || die
+
+	if tools_needed; then
+		pushd tools >/dev/null || die
+		ejam \
+			--prefix="${EPREFIX}"/usr \
+			"${OPTIONS[@]}" \
+			|| die "Building of Boost tools failed"
+		popd >/dev/null || die
+	fi
+}
+
+multilib_src_install() {
+	ejam \
+		--prefix="${ED}"/usr \
+		--includedir="${ED}"/usr/include \
+		--libdir="${ED}"/usr/$(get_libdir) \
+		"${OPTIONS[@]}" install || die "Installation of Boost libraries failed"
+
+	if tools_needed; then
+		dobin dist/bin/*
+
+		insinto /usr/share
+		doins -r dist/share/boostbook
+	fi
+
+	# boost's build system truely sucks for not having a destdir.  Because for
+	# this reason we are forced to build with a prefix that includes the
+	# DESTROOT, dynamic libraries on Darwin end messed up, referencing the
+	# DESTROOT instread of the actual EPREFIX.  There is no way out of here
+	# but to do it the dirty way of manually setting the right install_names.
+	if [[ ${CHOST} == *-darwin* ]]; then
+		einfo "Working around completely broken build-system(tm)"
+		local d
+		for d in "${ED}"/usr/lib/*.dylib; do
+			if [[ -f ${d} ]]; then
+				# fix the "soname"
+				ebegin "  correcting install_name of ${d#${ED}}"
+				install_name_tool -id "/${d#${D}}" "${d}"
+				eend $?
+				# fix references to other libs
+				refs=$(otool -XL "${d}" | \
+					sed -e '1d' -e 's/^\t//' | \
+					grep "^libboost_" | \
+					cut -f1 -d' ')
+				local r
+				for r in ${refs}; do
+					ebegin "    correcting reference to ${r}"
+					install_name_tool -change \
+						"${r}" \
+						"${EPREFIX}/usr/lib/${r}" \
+						"${d}"
+					eend $?
+				done
+			fi
+		done
+	fi
+}
+
+multilib_src_install_all() {
+	if ! use numpy; then
+		rm -r "${ED}"/usr/include/boost/python/numpy* || die
+	fi
+
+	if use python; then
+		if use mpi; then
+			move_mpi_py_into_sitedir() {
+				python_moduleinto boost
+				python_domodule "${S}"/libs/mpi/build/__init__.py
+
+				python_domodule "${ED}"/usr/$(get_libdir)/boost-${EPYTHON}/mpi.so
+				rm -r "${ED}"/usr/$(get_libdir)/boost-${EPYTHON} || die
+
+				python_optimize
+			}
+			python_foreach_impl move_mpi_py_into_sitedir
+		else
+			rm -r "${ED}"/usr/include/boost/mpi/python* || die
+		fi
+	else
+		rm -r "${ED}"/usr/include/boost/{python*,mpi/python*,parameter/aux_/python,parameter/python*} || die
+	fi
+
+	if ! use nls; then
+		rm -r "${ED}"/usr/include/boost/locale || die
+	fi
+
+	if ! use context; then
+		rm -r "${ED}"/usr/include/boost/context || die
+		rm -r "${ED}"/usr/include/boost/coroutine{,2} || die
+		rm "${ED}"/usr/include/boost/asio/spawn.hpp || die
+	fi
+
+	if use doc; then
+		# find extraneous files that shouldn't be installed
+		# as part of the documentation and remove them.
+		find libs/*/* \( -iname 'test' -o -iname 'src' \) -exec rm -rf '{}' + || die
+		find doc \( -name 'Jamfile.v2' -o -name 'build' -o -name '*.manifest' \) -exec rm -rf '{}' + || die
+		find tools \( -name 'Jamfile.v2' -o -name 'src' -o -name '*.cpp' -o -name '*.hpp' \) -exec rm -rf '{}' + || die
+
+		docinto html
+		dodoc *.{htm,html,png,css}
+		dodoc -r doc libs more tools
+
+		# To avoid broken links
+		dodoc LICENSE_1_0.txt
+
+		dosym ../../../../include/boost /usr/share/doc/${PF}/html/boost
+	fi
+}
+
+pkg_preinst() {
+	# Yay for having symlinks that are nigh-impossible to remove without
+	# resorting to dirty hacks like these. Removes lingering symlinks
+	# from the slotted versions.
+	local symlink
+	for symlink in "${EROOT}"/usr/include/boost "${EROOT}"/usr/share/boostbook; do
+		if [[ -L ${symlink} ]]; then
+			rm -f "${symlink}" || die
+		fi
+	done
+
+	# some ancient installs still have boost cruft lying around
+	# for unknown reasons, causing havoc for reverse dependencies
+	# Bug: 607734
+	rm -rf "${EROOT}"/usr/include/boost-1_[3-5]? || die
+}
+
+pkg_postinst() {
+	elog "Boost.Regex is *extremely* ABI sensitive. If you get errors such as"
+	elog
+	elog "  undefined reference to \`boost::re_detail_$(ver_cut 1)0$(ver_cut 2)00::cpp_regex_traits_implementation"
+	elog "    <char>::transform_primary[abi:cxx11](char const*, char const*) const'"
+	elog
+	elog "Then you need to recompile Boost and all its reverse dependencies"
+	elog "using the same toolchain. In general, *every* change of the C++ toolchain"
+	elog "requires a complete rebuild of the Boost-dependent ecosystem."
+	elog
+	elog "See for instance https://bugs.gentoo.org/638138"
+}
diff --git a/dev-libs/boost/files/boost-1.80.0-disable_icu_rpath.patch b/dev-libs/boost/files/boost-1.80.0-disable_icu_rpath.patch
new file mode 100644
index 000000000000..1f4ec29fcf00
--- /dev/null
+++ b/dev-libs/boost/files/boost-1.80.0-disable_icu_rpath.patch
@@ -0,0 +1,13 @@
+--- a/libs/locale/build/Jamfile.v2
++++ b/libs/locale/build/Jamfile.v2
+@@ -82,8 +82,8 @@ ICU_LINK ?= [ modules.peek : ICU_LINK_LOCALE ] ;
+ 
+ if $(ICU_LINK)
+ {
+-    ICU_OPTS = <include>$(icu-path)/include <linkflags>$(ICU_LINK) <dll-path>$(icu-path)/bin <runtime-link>shared ;
+-    ICU64_OPTS = <include>$(icu-path)/include <linkflags>$(ICU_LINK) <dll-path>$(icu-path)/bin64 <runtime-link>shared ;
++    ICU_OPTS = <include>$(icu_path)/include <linkflags>$(ICU_LINK) <runtime-link>shared ;
++    ICU64_OPTS = <include>$(icu_path)/include <linkflags>$(ICU_LINK) <runtime-link>shared ;
+ } else
+ {
+     searched-lib icuuc : :  <name>icuuc
diff --git a/dev-libs/boost/files/boost-1.80.0-fix-mips1-transition.patch b/dev-libs/boost/files/boost-1.80.0-fix-mips1-transition.patch
new file mode 100644
index 000000000000..4f5e81c925b3
--- /dev/null
+++ b/dev-libs/boost/files/boost-1.80.0-fix-mips1-transition.patch
@@ -0,0 +1,24 @@
+--- a/boostcpp.jam
++++ b/boostcpp.jam
+@@ -634,7 +634,7 @@ rule address-model ( )
+     return <conditional>@boostcpp.deduce-address-model ;
+ }
+ 
+-local deducable-architectures = arm mips1 power riscv s390x sparc x86 combined ;
++local deducable-architectures = arm mips power riscv s390x sparc x86 combined ;
+ feature.feature deduced-architecture : $(deducable-architectures) : propagated optional composite hidden ;
+ for a in $(deducable-architectures)
+ {
+@@ -645,10 +645,10 @@ rule deduce-architecture ( properties * )
+ {
+     local result ;
+     local filtered = [ toolset-properties $(properties) ] ;
+-    local names = arm mips1 power riscv s390x sparc x86 combined ;
++    local names = arm mips power riscv s390x sparc x86 combined ;
+     local idx = [ configure.find-builds "default architecture" : $(filtered)
+         : /boost/architecture//arm
+-        : /boost/architecture//mips1
++        : /boost/architecture//mips
+         : /boost/architecture//power
+         : /boost/architecture//riscv
+         : /boost/architecture//s390x
diff --git a/dev-libs/boost/files/boost-1.80.0-unordered-fix.patch b/dev-libs/boost/files/boost-1.80.0-unordered-fix.patch
new file mode 100644
index 000000000000..51776094386e
--- /dev/null
+++ b/dev-libs/boost/files/boost-1.80.0-unordered-fix.patch
@@ -0,0 +1,192 @@
+From f9eae4153f4ea9aac4b6c46e660ec92824d5827f Mon Sep 17 00:00:00 2001
+From: Christian Mazakas <christian.mazakas@gmail.com>
+Date: Tue, 16 Aug 2022 14:34:58 -0700
+Subject: [PATCH] Update code to be valid when the internal `buckets_` data
+ member is moved-from
+
+---
+ boost/unordered/detail/fca.hpp        | 18 +++++--
+ .../boost/unordered/detail/implementation.hpp | 49 +++++++++++--------
+ boost/unordered/unordered_map.hpp     |  8 +++
+ boost/unordered/unordered_set.hpp     |  8 +++
+ 4 files changed, 58 insertions(+), 25 deletions(-)
+
+diff --git a/boost/unordered/detail/fca.hpp b/boost/unordered/detail/fca.hpp
+index 19fafe739..a1d14d957 100644
+--- a/boost/unordered/detail/fca.hpp
++++ b/boost/unordered/detail/fca.hpp
+@@ -646,7 +646,7 @@ namespace boost {
+ 
+         size_type bucket_count() const { return size_; }
+ 
+-        iterator begin() const { return ++at(size_); }
++        iterator begin() const { return size_ == 0 ? end() : ++at(size_); }
+ 
+         iterator end() const
+         {
+@@ -660,6 +660,10 @@ namespace boost {
+ 
+         local_iterator begin(size_type n) const
+         {
++          if (size_ == 0) {
++            return this->end(n);
++          }
++
+           return local_iterator(
+             (buckets + static_cast<difference_type>(n))->next);
+         }
+@@ -670,12 +674,16 @@ namespace boost {
+ 
+         iterator at(size_type n) const
+         {
+-          std::size_t const N = group::N;
++          if (size_ > 0) {
++            std::size_t const N = group::N;
+ 
+-          iterator pbg(buckets + static_cast<difference_type>(n),
+-            groups + static_cast<difference_type>(n / N));
++            iterator pbg(buckets + static_cast<difference_type>(n),
++              groups + static_cast<difference_type>(n / N));
+ 
+-          return pbg;
++            return pbg;
++          } else {
++            return this->end();
++          }
+         }
+ 
+         span<Bucket> raw()
+diff --git a/boost/unordered/detail/implementation.hpp b/boost/unordered/detail/implementation.hpp
+index 2cc27c5d4..373236754 100644
+--- a/boost/unordered/detail/implementation.hpp
++++ b/boost/unordered/detail/implementation.hpp
+@@ -2054,12 +2054,14 @@ namespace boost {
+ 
+         std::size_t bucket_size(std::size_t index) const
+         {
+-          bucket_iterator itb = buckets_.at(index);
+-          node_pointer n = itb->next;
+           std::size_t count = 0;
+-          while (n) {
+-            ++count;
+-            n = n->next;
++          if (size_ > 0) {
++            bucket_iterator itb = buckets_.at(index);
++            node_pointer n = itb->next;
++            while (n) {
++              ++count;
++              n = n->next;
++            }
+           }
+           return count;
+         }
+@@ -2420,11 +2422,14 @@ namespace boost {
+         node_pointer find_node_impl(
+           Key const& x, bucket_iterator itb) const
+         {
+-          key_equal const& pred = this->key_eq();
+-          node_pointer p = itb->next;
+-          for (; p; p = p->next) {
+-            if (pred(x, extractor::extract(p->value()))) {
+-              break;
++          node_pointer p = node_pointer();
++          if (itb != buckets_.end()) {
++            key_equal const& pred = this->key_eq();
++            p = itb->next;
++            for (; p; p = p->next) {
++              if (pred(x, extractor::extract(p->value()))) {
++                break;
++              }
+             }
+           }
+           return p;
+@@ -2453,11 +2458,13 @@ namespace boost {
+         inline iterator transparent_find(
+           Key const& k, Hash const& h, Pred const& pred) const
+         {
+-          std::size_t const key_hash = h(k);
+-          bucket_iterator itb = buckets_.at(buckets_.position(key_hash));
+-          for (node_pointer p = itb->next; p; p = p->next) {
+-            if (BOOST_LIKELY(pred(k, extractor::extract(p->value())))) {
+-              return iterator(p, itb);
++          if (size_ > 0) {
++            std::size_t const key_hash = h(k);
++            bucket_iterator itb = buckets_.at(buckets_.position(key_hash));
++            for (node_pointer p = itb->next; p; p = p->next) {
++              if (BOOST_LIKELY(pred(k, extractor::extract(p->value())))) {
++                return iterator(p, itb);
++              }
+             }
+           }
+ 
+@@ -2467,11 +2474,13 @@ namespace boost {
+         template <class Key>
+         node_pointer* find_prev(Key const& key, bucket_iterator itb)
+         {
+-          key_equal pred = this->key_eq();
+-          for (node_pointer* pp = boost::addressof(itb->next); *pp;
+-               pp = boost::addressof((*pp)->next)) {
+-            if (pred(key, extractor::extract((*pp)->value()))) {
+-              return pp;
++          if (size_ > 0) {
++            key_equal pred = this->key_eq();
++            for (node_pointer* pp = boost::addressof(itb->next); *pp;
++                pp = boost::addressof((*pp)->next)) {
++              if (pred(key, extractor::extract((*pp)->value()))) {
++                return pp;
++              }
+             }
+           }
+           typedef node_pointer* node_pointer_pointer;
+diff --git a/boost/unordered/unordered_map.hpp b/boost/unordered/unordered_map.hpp
+index 97908fb65..3e25a28a2 100644
+--- a/boost/unordered/unordered_map.hpp
++++ b/boost/unordered/unordered_map.hpp
+@@ -2069,6 +2069,10 @@ namespace boost {
+     template <class K, class T, class H, class P, class A>
+     float unordered_map<K, T, H, P, A>::load_factor() const BOOST_NOEXCEPT
+     {
++      if (table_.size_ == 0) {
++        return 0.0f;
++      }
++
+       BOOST_ASSERT(table_.bucket_count() != 0);
+       return static_cast<float>(table_.size_) /
+              static_cast<float>(table_.bucket_count());
+@@ -2506,6 +2510,10 @@ namespace boost {
+     template <class K, class T, class H, class P, class A>
+     float unordered_multimap<K, T, H, P, A>::load_factor() const BOOST_NOEXCEPT
+     {
++      if (table_.size_ == 0) {
++        return 0.0f;
++      }
++
+       BOOST_ASSERT(table_.bucket_count() != 0);
+       return static_cast<float>(table_.size_) /
+              static_cast<float>(table_.bucket_count());
+diff --git a/boost/unordered/unordered_set.hpp b/boost/unordered/unordered_set.hpp
+index 8721a68a0..82d323c6e 100644
+--- a/boost/unordered/unordered_set.hpp
++++ b/boost/unordered/unordered_set.hpp
+@@ -1586,6 +1586,10 @@ namespace boost {
+     template <class T, class H, class P, class A>
+     float unordered_set<T, H, P, A>::load_factor() const BOOST_NOEXCEPT
+     {
++      if (table_.size_ == 0) {
++        return 0.0f;
++      }
++
+       BOOST_ASSERT(table_.bucket_count() != 0);
+       return static_cast<float>(table_.size_) /
+              static_cast<float>(table_.bucket_count());
+@@ -1986,6 +1990,10 @@ namespace boost {
+     template <class T, class H, class P, class A>
+     float unordered_multiset<T, H, P, A>::load_factor() const BOOST_NOEXCEPT
+     {
++      if (table_.size_ == 0) {
++        return 0.0f;
++      }
++
+       BOOST_ASSERT(table_.bucket_count() != 0);
+       return static_cast<float>(table_.size_) /
+              static_cast<float>(table_.bucket_count());