--- /dev/null
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python2_7 python3_{6,7} )
+inherit bash-completion-r1 estack eutils toolchain-funcs python-r1 linux-info
+
+MY_PV="${PV/_/-}"
+MY_PV="${MY_PV/-pre/-git}"
+
+DESCRIPTION="Userland tools for Linux Performance Counters"
+HOMEPAGE="https://perf.wiki.kernel.org/"
+
+LINUX_V="${PV:0:1}.x"
+if [[ ${PV} == *_rc* ]] ; then
+ LINUX_VER=$(ver_cut 1-2).$(($(ver_cut 3)-1))
+ PATCH_VERSION=$(ver_cut 1-3)
+ LINUX_PATCH=patch-${PV//_/-}.xz
+ SRC_URI="https://www.kernel.org/pub/linux/kernel/v${LINUX_V}/testing/${LINUX_PATCH}
+ https://www.kernel.org/pub/linux/kernel/v${LINUX_V}/testing/v${PATCH_VERSION}/${LINUX_PATCH}"
+elif [[ ${PV} == *.*.* ]] ; then
+ # stable-release series
+ LINUX_VER=$(ver_cut 1-2)
+ LINUX_PATCH=patch-${PV}.xz
+ SRC_URI="https://www.kernel.org/pub/linux/kernel/v${LINUX_V}/${LINUX_PATCH}"
+else
+ LINUX_VER=${PV}
+ SRC_URI=""
+fi
+
+LINUX_SOURCES="linux-${LINUX_VER}.tar.xz"
+SRC_URI+=" https://www.kernel.org/pub/linux/kernel/v${LINUX_V}/${LINUX_SOURCES}"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~mips ~ppc ~ppc64 ~x86 ~amd64-linux ~x86-linux"
+IUSE="audit clang crypt debug +demangle +doc gtk java lzma numa perl python slang systemtap unwind zlib"
+# TODO babeltrace
+REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"
+
+RDEPEND="audit? ( sys-process/audit )
+ crypt? ( dev-libs/openssl:0= )
+ clang? (
+ sys-devel/clang:*
+ sys-devel/llvm:*
+ )
+ demangle? ( sys-libs/binutils-libs:= )
+ gtk? ( x11-libs/gtk+:2 )
+ java? ( virtual/jre:* )
+ lzma? ( app-arch/xz-utils )
+ numa? ( sys-process/numactl )
+ perl? ( dev-lang/perl:= )
+ python? ( ${PYTHON_DEPS} )
+ slang? ( sys-libs/slang )
+ systemtap? ( dev-util/systemtap )
+ unwind? ( sys-libs/libunwind )
+ zlib? ( sys-libs/zlib )
+ dev-libs/elfutils"
+DEPEND="${RDEPEND}
+ >=sys-kernel/linux-headers-4.19
+ ${LINUX_PATCH+dev-util/patchutils}
+ sys-devel/bison
+ sys-devel/flex
+ java? ( virtual/jdk )
+ doc? (
+ app-text/asciidoc
+ app-text/sgml-common
+ app-text/xmlto
+ sys-process/time
+ )"
+
+S_K="${WORKDIR}/linux-${LINUX_VER}"
+S="${S_K}/tools/perf"
+
+CONFIG_CHECK="~PERF_EVENTS ~KALLSYMS"
+
+src_unpack() {
+ local paths=(
+ tools/arch tools/build tools/include tools/lib tools/perf tools/scripts
+ scripts include lib "arch/*/lib"
+ )
+
+ # We expect the tar implementation to support the -j option (both
+ # GNU tar and libarchive's tar support that).
+ echo ">>> Unpacking ${LINUX_SOURCES} (${paths[*]}) to ${PWD}"
+ tar --wildcards -xpf "${DISTDIR}"/${LINUX_SOURCES} \
+ "${paths[@]/#/linux-${LINUX_VER}/}" || die
+
+ if [[ -n ${LINUX_PATCH} ]] ; then
+ eshopts_push -o noglob
+ ebegin "Filtering partial source patch"
+ filterdiff -p1 ${paths[@]/#/-i } -z "${DISTDIR}"/${LINUX_PATCH} \
+ > ${P}.patch
+ eend $? || die "filterdiff failed"
+ eshopts_pop
+ fi
+
+ local a
+ for a in ${A}; do
+ [[ ${a} == ${LINUX_SOURCES} ]] && continue
+ [[ ${a} == ${LINUX_PATCH} ]] && continue
+ unpack ${a}
+ done
+}
+
+src_prepare() {
+ default
+ if [[ -n ${LINUX_PATCH} ]] ; then
+ pushd "${S_K}" >/dev/null || die
+ eapply "${WORKDIR}"/${P}.patch
+ popd || die
+ fi
+
+ # Drop some upstream too-developer-oriented flags and fix the
+ # Makefile in general
+ sed -i \
+ -e "s:\$(sysconfdir_SQ)/bash_completion.d:$(get_bashcompdir):" \
+ "${S}"/Makefile.perf || die
+ # A few places still use -Werror w/out $(WERROR) protection.
+ sed -i -e 's:-Werror::' \
+ "${S}"/Makefile.perf "${S_K}"/tools/lib/bpf/Makefile || die
+
+ # Avoid the call to make kernelversion
+ echo "#define PERF_VERSION \"${MY_PV}\"" > PERF-VERSION-FILE
+
+ # The code likes to compile local assembly files which lack ELF markings.
+ find -name '*.S' -exec sed -i '$a.section .note.GNU-stack,"",%progbits' {} +
+}
+
+puse() { usex $1 "" no; }
+perf_make() {
+ # The arch parsing is a bit funky. The perf tools package is integrated
+ # into the kernel, so it wants an ARCH that looks like the kernel arch,
+ # but it also wants to know about the split value -- i386/x86_64 vs just
+ # x86. We can get that by telling the func to use an older linux version.
+ # It's kind of a hack, but not that bad ...
+
+ # LIBDIR sets a search path of perf-gtk.so. Bug 515954
+
+ local arch=$(tc-arch-kernel)
+ local java_dir
+ use java && java_dir="/etc/java-config-2/current-system-vm"
+ # FIXME: NO_CORESIGHT
+ # FIXME: NO_LIBBABELTRACE
+ emake V=1 VF=1 \
+ CC="$(tc-getCC)" CXX="$(tc-getCXX)" AR="$(tc-getAR)" LD="$(tc-getLD)" \
+ prefix="${EPREFIX}/usr" bindir_relative="bin" \
+ EXTRA_CFLAGS="${CFLAGS}" \
+ ARCH="${arch}" \
+ JDIR="${java_dir}" \
+ LIBCLANGLLVM=$(usex clang 1 "") \
+ NO_AUXTRACE="" \
+ NO_BACKTRACE="" \
+ NO_CORESIGHT=1 \
+ NO_DEMANGLE=$(puse demangle) \
+ NO_GTK2=$(puse gtk) \
+ NO_JVMTI=$(puse java) \
+ NO_LIBAUDIT=$(puse audit) \
+ NO_LIBBABELTRACE=1 \
+ NO_LIBBIONIC=1 \
+ NO_LIBBPF="" \
+ NO_LIBCRYPTO=$(puse crypt) \
+ NO_LIBDW_DWARF_UNWIND="" \
+ NO_LIBELF="" \
+ NO_LIBNUMA=$(puse numa) \
+ NO_LIBPERL=$(puse perl) \
+ NO_LIBPYTHON=$(puse python) \
+ NO_LIBUNWIND=$(puse unwind) \
+ NO_SDT=$(puse systemtap) \
+ NO_SLANG=$(puse slang) \
+ NO_LZMA=$(puse lzma) \
+ NO_ZLIB= \
+ WERROR=0 \
+ LIBDIR="/usr/libexec/perf-core" \
+ "$@"
+}
+
+src_compile() {
+ # test-clang.bin not build with g++
+ if use clang; then
+ pushd "${S_K}/tools/build/feature/" || die
+ make V=1 CXX=${CHOST}-clang++ test-clang.bin || die
+ popd
+ fi
+ perf_make -f Makefile.perf
+ use doc && perf_make -C Documentation
+}
+
+src_test() {
+ :
+}
+
+src_install() {
+ _install_python_ext() {
+ perf_make -f Makefile.perf install-python_ext DESTDIR="${D}"
+ }
+
+ perf_make -f Makefile.perf install DESTDIR="${D}"
+ if use python; then
+ python_foreach_impl _install_python_ext
+ fi
+
+ rm -rv "${ED}"/usr/share/doc/perf-tip || die
+
+ if use gtk; then
+ mv "${ED}"/usr/$(get_libdir)/libperf-gtk.so \
+ "${ED}"/usr/libexec/perf-core || die
+ fi
+
+ dodoc CREDITS
+
+ dodoc *txt Documentation/*.txt
+ if use doc ; then
+ HTML_DOCS="Documentation/*.html" einstalldocs
+ doman Documentation/*.1
+ fi
+}
+
+pkg_postinst() {
+ if ! use doc ; then
+ elog "Without the doc USE flag you won't get any documentation nor man pages."
+ elog "And without man pages, you won't get any --help output for perf and its"
+ elog "sub-tools."
+ fi
+}
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