pmaports/cross/crossdirect/APKBUILD

# Wrapper for the "crossdirect" compilation method.
# pmbootstrap mounts the native chroot in the foreign arch (e.g. armhf) chroot
# as /native. This package gets installed into the native chroot, and creates
# wrappers like:
#
# /native/usr/lib/crossdirect/armhf/gcc
# -> /native/usr/bin/armv6-alpine-linux-muslgnueabihf-gcc
#
# When building packages in the armhf chroot, PATH will get prepended with
# "/native/usr/lib/crossdirect/armhf". The end game is of course invoking the
# cross compiler from the native chroot, running at native speed, whenever
# calling the compiler from the foreign arch chroot. See crossdirect.c for
# implementation details (llvm, fakeroot, rpath).

pkgname=crossdirect
pkgver=3
pkgrel=0
pkgdesc="Wrappers to launch native cross compilers in foreign chroots"
url="https://postmarketOS.org"
arch="all"
license="MIT"
options=""
source="crossdirect.c"

build() {
	cd "$srcdir"
	# Architectures and binaries
	_archs="x86_64 armhf armv7 aarch64"
	for _arch in $_archs; do
		[ "$_arch" == "$CARCH" ] && continue
		_hostspec="$(arch_to_hostspec $_arch)"

		# Build with -Werror, because we maintain this short program. (If
		# upstream is elsewhere, having -Werror is usually not desired.)
		$CC -o "crossdirect-$_arch" \
			-static \
			-Werror \
			-DHOSTSPEC="\"$_hostspec\"" \
			crossdirect.c
	done
}

package() {
	# Architectures and binaries
	_archs="x86_64 armhf armv7 aarch64"
	_bins="c++ cc cpp g++ gcc clang clang++"

	# Iterate over architectures
	for _arch in $_archs; do
		[ "$_arch" == "$CARCH" ] && continue

		# Put arch-specific crossdirect wrapper in arch-specific bin folder
		_bindir="$pkgdir/usr/lib/crossdirect/$_arch"
		_hostspec="$(arch_to_hostspec $_arch)"
		mkdir -p "$_bindir"
		cd "$_bindir"
		cp "$srcdir/crossdirect-$_arch" "./"

		# Create compiler symlinks
		for _bin in $_bins; do
			ln -s "crossdirect-$_arch" "$_bin"
			ln -s "crossdirect-$_arch" "$_hostspec-$_bin"
		done
	done
}
sha512sums="f8366add6ba2ac6d9f8af89f389c69914009b12b21e6608121a78d1cd9afe287e24eafb0c21d80d096df9eee9a23cc2e6a5408f6355e27be05203186a0bf9814  crossdirect.c"