scripts: add script to generate APK cross file

scripts/generate-meson-crossfile.sh

@@ -0,0 +1,51 @@
+#!/bin/sh
+
+set -eu
+
+_target_endianess=little
+_target_cpu="$CARCH"
+
+case "$CARCH" in
+	mips*)
+		_target_endianness=big
+		_target_cpu_family=mips
+		;;
+	arm*)
+		_target_cpu_family=arm
+		;;
+	ppc64le)
+		_target_cpu_family=ppc64
+		;;
+	aarch64|x86*)
+		# $CARCH maps 1:1 to _cpu_family for meson for these arches
+		_target_cpu_family="$CARCH"
+		;;
+esac
+
+# Keep in mind that CC, CXX etc. are the binaries to compile from host
+# to target, not from host to host!
+cat > apk.cross <<EOF
+[binaries]
+c = '${CC}'
+cpp = '${CXX}'
+ar = '${AR}'
+nm = '${NM}'
+ld = '${LD}'
+strip = '${STRIP}'
+readelf = '${READELF}'
+objcopy = '${OBJCOPY}'
+pkgconfig = 'pkg-config'
+[properties]
+needs_exe_wrapper = true
+c_args = ['$(echo ${CFLAGS} | sed -r "s/\s+/','/g")']
+c_link_args = ['$(echo ${LDFLAGS} | sed -r "s/\s+/','/g")']
+cpp_args = ['$(echo ${CXXFLAGS} | sed -r "s/\s+/','/g")']
+cpp_link_args = ['$(echo ${LDFLAGS} | sed -r "s/\s+/','/g")']
+[host_machine]
+system = 'linux'
+cpu_family = '${_target_cpu_family}'
+cpu = '${_target_cpu}'
+endian = '${_target_endianess}'
+EOF
+
+echo "Generating crossfile is done. You can invoke meson with the cross file with 'meson --cross apk.cross' now."