#!/bin/sh -efu
#
# brp-strip-lto - Strip LTO sections and symbols from object files
#
# LTO bytecode needs to be stripped for distributions, because it's
# GCC version dependent:
#   "The bytecode files are versioned and there is a strict version
#   check, so bytecode files generated in one version of GCC do not
#   work with an older or newer version of GCC." -- gcc(1).
#
# Based on brp-strip-lto (Fedora) and brp-debuginfo.
# Copyright (c) 2021 Vitaly Chikunov <vt@altlinux.org>.
# License: GPLv2+.

# Implementation notes:
# - xargs -Px -nx to start parallelizing sooner.
# - %brp_strip_none is respected.

. @RPMCONFIGDIR@/rpmb-functions
ValidateBuildRoot

cd "$RPM_BUILD_ROOT"
mkdir -p .tmp
rc=0

# They skip /usr/lib/debug from the search, but why. There aren't
# such objects nor meaning to skip stripping them.
# Only skip internal temporary workspace.
find -path './.*' -prune -o -name '*.[ao]' -type f -print | \
while read -r f; do
	for pat in ${RPM_BRP_STRIP_NONE-}; do
		if [ -z "${f##.$pat}" ]; then
			f=
			continue
		fi
	done
	[ -n "$f" ] && printf "%s\0" "$f"
done | \
eu-elfclassify --not-program --not-library --not-linux-kernel-module --stdin0 --print0 | \
xargs -0 -r -P$(nproc) -n$(nproc) @RPMCONFIGDIR@/process-lto || rc=$?

if [ -e .tmp/lto-suggest ]; then
	single='this file contains'
	plural='these files contain'
	[ "$(wc -c < .tmp/lto-suggest)" = 1 ] &&
		phrase="$single" ||
		phrase="$plural"
	sed "s/^/${0##*/}: /" >&2 <<EOF
Most likely $phrase GIMPLE bytecode that should NOT be packaged
since its format can change between GCC versions.
Use -ffat-lto-objects option to package machine code in static libraries, e.g.
%{?optflags_lto:%global optflags_lto %optflags_lto -ffat-lto-objects}
Alternatively, you might want to stop packaging static libraries
or disable link-time optimization for this package.
EOF
fi

exit $rc