k4be-gentoo-overlay/cross-avr/avr-libc/avr-libc-2.3.2.ebuild

# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI="8"

CHOST="avr"
CTARGET="avr"

inherit flag-o-matic

DESCRIPTION="C library for Atmel AVR microcontrollers"
HOMEPAGE="https://github.com/avrdudes/avr-libc https://www.nongnu.org/avr-libc/"

# Upstream moved from Savannah to GitHub with 2.2.0.  The GitHub "release"
# tarball ships a pre-generated ./configure and the avr/{lib,devices} trees
# (mlib-gen.py output), so no bootstrap / autotools / python is needed to
# build it.  Manual pages are no longer a separate download; they are built
# from the tree only when doxygen is present, which we do not pull in.
MY_TAG="avr-libc-$(ver_rs 1- '_')-release"
SRC_URI="https://github.com/avrdudes/avr-libc/releases/download/${MY_TAG}/${P}.tar.bz2"

LICENSE="BSD"
SLOT="0"
# 'amd64' is a blessed placeholder for crossdev. It could
# be any other arch. See bug #620316#c5
# Don't add more arches to KEYWORDS.
KEYWORDS="amd64"
IUSE="headers-only"

DEPEND=">=sys-devel/crossdev-0.9.1"
[[ ${CATEGORY/cross-} != ${CATEGORY} ]] \
	&& RDEPEND="!dev-embedded/avr-libc" \
	|| RDEPEND=""

DOCS="AUTHORS NEWS NEWS.md README.md"

pkg_setup() {
	# check for avr-gcc, bug #134738
	ebegin "Checking for avr-gcc"
	if type -p avr-gcc > /dev/null ; then
		eend 0
	else
		eend 1

		eerror
		eerror "Failed to locate 'avr-gcc' in \$PATH. You can install an AVR toolchain using:"
		eerror "  $ crossdev -t avr"
		eerror
		die "AVR toolchain not found"
	fi
}

src_prepare() {
	default

	# work around broken gcc versions PR45261: drop MCUs the installed
	# avr-gcc does not know about so ./configure does not choke on them.
	local mcu
	for mcu in $(sed -r -n '/CHECK_AVR_DEVICE/{s:.*[(](.*)[)]:\1:;p}' configure.ac) ; do
		if avr-gcc -E - -mmcu=${mcu} <<<"" |& grep -q 'unknown MCU' ; then
			sed -i "/HAS_${mcu}=yes/s:yes:no:" configure || die
		fi
	done

	strip-flags
	strip-unsupported-flags
}

src_configure() {
	# --enable-device-lib builds the per-device lib<mcu>.a / crt<mcu>.o.
	# It is on by default with avr-gcc >= 5.1 but be explicit.  Docs are
	# off by default in 2.2+; keep them off (no doxygen dependency).
	econf \
		--host=avr \
		--enable-device-lib \
		--disable-doc
}

src_install() {
	default

	# Make sure different cross-compilers don't collide #414075
	if [[ -d ${ED}/usr/share/doc/${PF} ]] ; then
		mv "${ED}"/usr/share/doc/{${PF},${CTARGET}-${PF}} || die
	fi

	# https://github.com/avrdudes/avr-libc/issues/1060 documents that,
	# since avr-libc 2.3.0, crt<mcu>.o only *declares* `main` as a
	# referenced symbol so the linker is supposed to pull in
	# __call_main (which actually calls main()+exit()) from
	# lib<mcu>.a's call_main.o.  In practice a plain `.global main` in
	# crt<mcu>.o is satisfied directly by the user's own main() and
	# never triggers extraction of call_main.o, so .init9 stays empty
	# and the reset vector falls straight through into __bad_interrupt
	# (jmp 0) -- main() is never called and the device does nothing.
	# Work around this by forcing `-u __call_main` on every link via a
	# small specs file dropped next to avr-gcc's own specs; this is a
	# no-op for pre-2.3.0-style self-contained crt objects.
	local gccdir
	gccdir=$(avr-gcc -print-search-dirs | sed -n 's/^install: //p') || die
	[[ -d ${gccdir} ]] || die "could not determine avr-gcc install dir"

	local specs="${T}/specs"
	avr-gcc -dumpspecs > "${specs}" || die
	sed -i '/^\*lib:$/{n;s/$/ -u __call_main/}' "${specs}" || die
	grep -q -- '-u __call_main' "${specs}" || die "failed to patch *lib spec"

	insinto "${gccdir#${EPREFIX}}"
	newins "${specs}" specs
}