From 18d7422d8787e3de08b7df1cb712d2613a70ba9b Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Thu, 26 Apr 2012 02:59:08 -0400
Subject: Support cross-building with kbuild.

---
(limited to 'src/opkbuild.sh')

diff --git a/src/opkbuild.sh b/src/opkbuild.sh
index bc32915..a167716 100644
--- a/src/opkbuild.sh
+++ b/src/opkbuild.sh
@@ -197,25 +197,44 @@ if [ ! -f "@@DATADIR@@/opkhelper/archtab" ]; then
 	exit 1
 fi
 
-# Look up build GNU architecture name.
-export OH_BUILD_ARCH_GNU="$(sed -n \
-	"s/^${OH_BUILD_ARCH_DIST}[ \\t][ \\t]*\\(.*\\)$/\\1/p" \
+archtab_bre='[ \t][ \t]*\([^ \t][^ \t]*[ \t][ \t]*[^ \t][^ \t]*\)'
+
+# TODO: kbuild doesn't have standardized architecture names.  For example, IA-32
+# is known as "x86" in Linux and "i386" in BusyBox.  So we should support a
+# comma-separated list of possible values and try to find one in src/arch once
+# the software source code is copied into the work area.
+
+# TODO: Ideally, we should have a tool like debhelper's dh_auto_configure that
+# detects the build system in use and configures the build automatically,
+# including cross building options.
+
+# Look up build GNU and kbuild architecture names.
+archtab_row_build="$(sed -n \
+	"s/^${OH_BUILD_ARCH_DIST}${archtab_bre}\$/\\1/p" \
 	"@@DATADIR@@/opkhelper/archtab")"
-if [ -z "${OH_BUILD_ARCH_GNU}" ]; then
+if [ -z "${archtab_row_build}" ]; then
 	printf 'opkbuild: Error: "%s" not found in architecture table.\n' \
 		"${OH_BUILD_ARCH_DIST}" >&2
 	exit 1
 fi
+read OH_BUILD_ARCH_GNU OH_BUILD_ARCH_KBUILD <<EOF
+${archtab_row_build}
+EOF
+export OH_BUILD_ARCH_GNU OH_BUILD_ARCH_KBUILD
 
-# Look up host GNU architecture name.
-export OH_HOST_ARCH_GNU="$(sed -n \
-	"s/^${OH_HOST_ARCH_DIST}[ \\t][ \\t]*\\(.*\\)$/\\1/p" \
+# Look up host GNU and kbuild architecture names.
+archtab_row_host="$(sed -n \
+	"s/^${OH_HOST_ARCH_DIST}${archtab_bre}\$/\\1/p" \
 	"@@DATADIR@@/opkhelper/archtab")"
-if [ -z "${OH_HOST_ARCH_GNU}" ]; then
+if [ -z "${archtab_row_host}" ]; then
 	printf 'opkbuild: Error: "%s" not found in architecture table.\n' \
 		"${OH_HOST_ARCH_DIST}" >&2
 	exit 1
 fi
+read OH_HOST_ARCH_GNU OH_HOST_ARCH_KBUILD <<EOF
+${archtab_row_host}
+EOF
+export OH_HOST_ARCH_GNU OH_HOST_ARCH_KBUILD
 
 # Detect cross building.
 if [ "${OH_BUILD_ARCH_GNU}" != "${OH_HOST_ARCH_GNU}" ]; then
@@ -240,6 +259,9 @@ export READELF="${toolchain_prefix}readelf"
 export SIZE="${toolchain_prefix}size"
 export STRINGS="${toolchain_prefix}strings"
 export STRIP="${toolchain_prefix}strip"
+# These are used by kbuild (the build system of Linux, BusyBox, and others).
+export ARCH="${OH_HOST_ARCH_KBUILD}"
+export CROSS_COMPILE="${toolchain_prefix}"
 
 # Set build flags.
 if [ -f "@@DATADIR@@/opkhelper/buildflags/${OH_HOST_ARCH_CPU}" ]; then
@@ -248,12 +270,12 @@ fi
 
 # Print build and host architecture and platform information.
 printf 'opkbuild: Build system:\n'
-printf 'opkbuild:   Architecture:  %s (%s)\n' \
-	"${OH_BUILD_ARCH_DIST}" "${OH_BUILD_ARCH_GNU}"
+printf 'opkbuild:   Architecture:  %s (%s, %s)\n' \
+	"${OH_BUILD_ARCH_DIST}" "${OH_BUILD_ARCH_GNU}" "${OH_BUILD_ARCH_KBUILD}"
 printf 'opkbuild:   Platform:      %s\n' "${OH_BUILD_PLATFORM}"
 printf 'opkbuild: Host system:\n'
-printf 'opkbuild:   Architecture:  %s (%s)\n' \
-	"${OH_HOST_ARCH_DIST}" "${OH_HOST_ARCH_GNU}"
+printf 'opkbuild:   Architecture:  %s (%s, %s)\n' \
+	"${OH_HOST_ARCH_DIST}" "${OH_HOST_ARCH_GNU}" "${OH_HOST_ARCH_KBUILD}"
 printf 'opkbuild:   Platform:      %s\n' "${OH_HOST_PLATFORM:-<none>}"
 
 # Check build dependencies.
--
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