mkdir -p initrd
cd initrd
cat > init.c << '___EOF___'
+#ifndef NOLIBC
#include <unistd.h>
#include <sys/time.h>
+#endif
volatile unsigned long delaycount;
return 0;
}
___EOF___
-${CROSS_COMPILE}gcc -s -static -Os -o init init.c
+
+# build using nolibc on supported archs (smaller executable) and fall
+# back to regular glibc on other ones.
+if echo -e "#if __x86_64__||__i386__||__i486__||__i586__||__i686__" \
+ "||__ARM_EABI__||__aarch64__\nyes\n#endif" \
+ | ${CROSS_COMPILE}gcc -E -nostdlib -xc - \
+ | grep -q '^yes'; then
+ # architecture supported by nolibc
+ ${CROSS_COMPILE}gcc -fno-asynchronous-unwind-tables -fno-ident \
+ -nostdlib -include ../bin/nolibc.h -lgcc -s -static -Os \
+ -o init init.c
+else
+ ${CROSS_COMPILE}gcc -s -static -Os -o init init.c
+fi
+
rm init.c
echo "Done creating a statically linked C-language initrd"