[PATCH 3/5] meta: Allow cross-compilation for RISC-V

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

This arch still lacks crossbuild-essential-riscv64, so we need to stub
some pieces. Specifically, we have to create a dummy package of the same
name so that mk-build-deps works fine. For buildchroot-host, we replace
the package by open-coding its dependencies.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 meta/classes/dpkg-base.bbclass                                    | 2 ++
 meta/recipes-devtools/buildchroot/buildchroot-host.bb             | 7 +++++++
 .../crossbuild-essential-riscv64_0.1-isar.bb                      | 8 ++++++++
 3 files changed, 17 insertions(+)
 create mode 100644 meta/recipes-devtools/crossbuild-essential-riscv64/crossbuild-essential-riscv64_0.1-isar.bb

diff --git a/meta/classes/dpkg-base.bbclass b/meta/classes/dpkg-base.bbclass
index af9c9840..1decf587 100644
--- a/meta/classes/dpkg-base.bbclass
+++ b/meta/classes/dpkg-base.bbclass
@@ -10,6 +10,8 @@ inherit terminal
 
 DEPENDS ?= ""
 
+DEPENDS_append_riscv64 = "${@' crossbuild-essential-riscv64' if d.getVar('ISAR_CROSS_COMPILE', True) == '1' and d.getVar('PN') != 'crossbuild-essential-riscv64' else ''}"
+
 python do_adjust_git() {
     import subprocess
 
diff --git a/meta/recipes-devtools/buildchroot/buildchroot-host.bb b/meta/recipes-devtools/buildchroot/buildchroot-host.bb
index 408ad393..8e3a52cf 100644
--- a/meta/recipes-devtools/buildchroot/buildchroot-host.bb
+++ b/meta/recipes-devtools/buildchroot/buildchroot-host.bb
@@ -15,3 +15,10 @@ BUILDCHROOT_PREINSTALL ?= " \
     ${BUILDCHROOT_PREINSTALL_COMMON} \
     libc6:${DISTRO_ARCH} \
     crossbuild-essential-${DISTRO_ARCH}"
+
+BUILDCHROOT_PREINSTALL_riscv64 ?= " \
+    ${BUILDCHROOT_PREINSTALL_COMMON} \
+    libc6:${DISTRO_ARCH} \
+    gcc-riscv64-linux-gnu:native \
+    g++-riscv64-linux-gnu:native \
+    dpkg-cross:native"
diff --git a/meta/recipes-devtools/crossbuild-essential-riscv64/crossbuild-essential-riscv64_0.1-isar.bb b/meta/recipes-devtools/crossbuild-essential-riscv64/crossbuild-essential-riscv64_0.1-isar.bb
new file mode 100644
index 00000000..39f6a59a
--- /dev/null
+++ b/meta/recipes-devtools/crossbuild-essential-riscv64/crossbuild-essential-riscv64_0.1-isar.bb
@@ -0,0 +1,8 @@
+# This software is a part of ISAR.
+# Copyright (C) 2020 Siemens AG
+
+inherit dpkg-raw
+
+DPKG_ARCH = "all"
+
+ISAR_CROSS_BUILD = "0"
-- 
2.16.4