From d97fa1a1419683d0722d9356f236577f7515494f Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Sun, 29 Jan 2012 20:03:55 -0500
Subject: Attempt to detect the target architecture tuple.

---
diff --git a/src/opkbuild b/src/opkbuild
index d41d5bd..d85a0ad 100644
--- a/src/opkbuild
+++ b/src/opkbuild
@@ -103,6 +103,15 @@ elif [ -z "${platform}" ]; then
 	# ... and there are config files and one installable platform, build for it.
 fi
 
+# Attempt to detect the target architecture tuple.
+# NB: Currently cross-compiling is not supported.
+arch=$(opkg print-architecture | grep -E '^arch [^ -]+(-[^ -]+){3} [0-9]+$')
+if [ -z "${arch}" ]; then
+	printf 'opkbuild: Error: No installable architecture found\n' >&2
+elif [ $(echo "${arch}" | wc -l) -gt 1 ]; then
+	printf 'opkbuild: Error: Multiple installable architectures found\n' >&2
+fi
+
 # Make work area.
 printf 'opkbuild: Making work area...\n'
 mkdir tmp
@@ -115,6 +124,7 @@ version=$(oh_get_field Version)
 
 # Set environment variables for the build configuration.
 export OH_PLATFORM="${platform}"
+export OH_ARCH="${arch}"
 export OH_SRCPKG="${srcpkg}"
 export OH_PKGVER="${version%'-'*}"
 export OH_PKGREV="${version#*'-'}"
--
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