[patch] WIP patch to build native x32 rust toolchain

rust-x32.patch (text/plain), 2.33 KB, created by Steven Newbury on 2022-05-04 12:37:36 UTC

--- /usr/portage/dev-lang/rust/rust-1.60.0.ebuild	2022-04-08 22:09:51.000000000 +0100
+++ rust-1.60.0.ebuild	2022-05-04 13:33:54.356462331 +0100
@@ -246,8 +246,11 @@
 src_prepare() {
 	if ! use system-bootstrap; then
 		local rust_stage0_root="${WORKDIR}"/rust-stage0
-		local rust_stage0="rust-${RUST_STAGE0_VERSION}-$(rust_abi)"
-
+		if [[ ${ABI} == x32 ]]; then
+			local rust_stage0="rust-${RUST_STAGE0_VERSION}-x86_64-unknown-linux-gnu"
+		else
+			local rust_stage0="rust-${RUST_STAGE0_VERSION}-$(rust_abi)"
+		fi
 		"${WORKDIR}/${rust_stage0}"/install.sh --disable-ldconfig \
 			--without=rust-docs --destdir="${rust_stage0_root}" --prefix=/ || die
 	fi
@@ -300,7 +303,19 @@
 	# in case of prefix it will be already prefixed, as --print sysroot returns full path
 	[[ -d ${rust_stage0_root} ]] || die "${rust_stage0_root} is not a directory"
 
-	rust_target="$(rust_abi)"
+	# If this is x32 but using 64 bit rust-bin then "Canadian
+	# cross-compile".
+	# This requires amd64 abi to bootstrap the build toolchain even if
+	# not enabled
+	if [[ ${ABI} == x32 ]] && \
+			[[ $(rustc --print cfg | \
+			awk -F= -v key="target_pointer_width" '$1==key {print $2}') == \"64\" ]]; then
+		CBUILD=x86_64-linux-linux-gnu
+		use abi_x86_64 || abis+=( amd64 )
+	fi
+	rust_target="$(rust_abi ${CTARGET})"
+	rust_host="$(rust_abi ${CHOST})"
+	rust_build="$(rust_abi ${CBUILD})"
 
 	cat <<- _EOF_ > "${S}"/config.toml
 		changelog-seen = 2
@@ -325,8 +340,8 @@
 		build-stage = 2
 		test-stage = 2
 		doc-stage = 2
-		build = "${rust_target}"
-		host = ["${rust_target}"]
+		build = "${rust_build}"
+		host = ["${rust_host}"]
 		target = [${rust_targets}]
 		cargo = "${rust_stage0_root}/bin/cargo"
 		rustc = "${rust_stage0_root}/bin/rustc"
@@ -386,6 +401,11 @@
 		compression-formats = ["xz"]
 	_EOF_
 
+	cat <<- _EOF_ >> "${S}"/config.env
+		PKG_CONFIG_ALLOW_CROSS=1
+		CFG_COMPILER_HOST_TRIPLE=$(rust_abi $(get_abi_CHOST ${DEFAULT_ABI}))
+	_EOF_
+
 	for v in $(multilib_get_enabled_abi_pairs); do
 		rust_target=$(rust_abi $(get_abi_CHOST ${v##*.}))
 		arch_cflags="$(get_abi_CFLAGS ${v##*.})"
@@ -410,7 +430,8 @@
 		fi
 		if use system-llvm; then
 			cat <<- _EOF_ >> "${S}"/config.toml
-				llvm-config = "$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin/llvm-config"
+				llvm-config = "$(get_llvm_prefix
+				"${LLVM_MAX_SLOT}")/bin/$(get_abi_CHOST ${v##*.})-llvm-config"
 			_EOF_
 		fi
 	done